Diamond Core Drill & Drill Trouble Shooting Guide

Excessive Drill Wear

Signs: Rapid reduction in Diamond Drills diameter; visible wear on the cutting edges

• Incorrect feed rate or speed;
•  Inadequate coolant;
•  Material hardness
• Inappropriate drill specification
• Inappropriate wall thickness of diameter and dimensions of material
• Bond Hardness too Soft
• Incorrect RPM’s or Feed Rate
• Using Incorrect Coolant
• Coolant Not affectively used
•  Not Dressing the Drill
• Poor Equipment Maintenance

• Reduced cutting efficiency;
• Increased drill time
• Process Inconsistency & Inefficiency

•  Adjust feed rate and speed;
•   Ensure adequate coolant flow;
•  Use a drill suited for the material’s hardness
• Optimize Drill Specification
• Optimize Type of Coolant Used and How It Reaches Drilling Zone
• Optimize Drill RPM’s & Fee Rate
• Check the Condition of your Drilling Equipment
• Make sure the diamond drill is being dressed properly

Diamond Drills Breakage

Signs: Sudden snapping or fracturing of the diamond drill; visible cracks or chips on the diamond drill

•   Excessive pressure
•   Misalignment; Material defects

•  Sudden halt in drilling
•  Potential damage to workpiece

•  Apply correct pressure;
•  Ensure proper alignment;
•   Inspect material for defects before drilling

Poor Surface Finish

Signs: Rough or uneven hole finish; excessive burring around the hole entrance or exit

• Inadequate coolant;
• Worn Diamond Drill
• Incorrect feed rate or speed

• Rough hole surface
• Potential need for post-processing

• Ensure proper coolant flow;
•  Replace or sharpen diamond drill;
• Adjust feed rate and speed

Diamond Drill or Material Overheating

Signs: Excessive heat generation; discoloration of the Diamond Drills or material; smoke or burning smell

• Insufficient coolant;
• High feed rate or speed;
• Prolonged drilling without breaks
• Incorrect Coolant or Mix Ratio Used
• Inadequate Amount of Coolant Reaching Drilling zone
•  Incorrect Diamond Drill Specification

• Premature wear of the drill;
• Potential thermal damage to the material
• Possible Chipping
• Possible Material Micro Cracking
• Possible Material Deformation
• Change in Material Properties

•  Optimize Coolant:
•  Align the coolant nozzles
• Increase coolant flow
•  Use specialized water soluble coolant
• Adjust feed rate and speed
•  Allow intermittent breaks during drilling
• Try using diamond drill more optimized for the application

Core Ejection Issues

Signs: Difficulty in removing the core from the material; the core sticks or breaks during ejection

• Inadequate core breaker;
• Incorrect drill design;
• Material adhesion

• Difficulty in removing the core;
• Potential damage to the core or hole

• Use an adequate core breaker;
• Choose the correct drill design;
• Apply release agents if necessary

Diamond Drills Wonders

Signs: Diamond Drill deviates from the intended path; uneven hole diameter; off-center hole entrance or exit

• Misalignment;
• Uneven surface;
• Inadequate drill rigidity

• Inaccurate hole location;
• Potential damage to workpiece

• Ensure proper alignment;
• Flatten surface before drilling;
• Use a more rigid drill setup

Material Cracking

Signs: Visible cracks in the material around the hole; chipping or flaking of the material surface

• Excessive pressure;
• Thermal shock;
• Material flaws

• Cracks in the material;
• Compromised structural integrity

• Reduce pressure;
• Ensure proper coolant temperature;
• Inspect and pre-treat material if necessary

Diamond Drills Glazing

Signs: Smooth, shiny surface on the Diamond Drills edges; reduced cutting debris; increased force required to drill

• Inadequate coolant;
• Too low feed rate;
• Material abrasiveness

• Reduced cutting ability;
• Increased friction and heat

• Increase coolant flow;
• Adjust feed rate;
• Use a drill suited for abrasive materials

Inconsistent Hole Size

Signs: Hole diameter varies from top to bottom or between multiple holes; holes not consistent with Diamond Drills size

• Drill wear;
• Misalignment;
• Material heterogeneity

• Holes not meeting tolerance;
• Potential rework or scrap

• Monitor and replace Diamond Drills as needed;
• Ensure proper alignment;
• Adjust process for material variance

Inaccurate Hole Tolerances

Sings: Holes are consistently larger or smaller than the specified diameter. Measurement of the hole diameter shows deviation from the design specifications.

1.  Diamond wear or damage
2. Inaccurate Diamond Drill size
3.  Misalignment or instability during drilling.
4. Excessive Run Out
5. Inaccurate Tolerances
6. Runout on Collet or Chuck
7.  Incorrect Material Mount
8.  Incorrect Drilling Equipment
9. Incorrection Drill Specification
10. Not Maintaining the Drill
11. Incorrect Drilling Technique runout

• Compromised precision in hole dimensions;
• Potential for part rejection or rework.

1. Regularly inspect and replace worn or damaged diamond drills
2. Verify diamond drill size before use.
3. Ensure drill and workpiece stability and alignment.

Noise and Vibration

Signs: Unusual sounds during operation; excessive shaking or movement of the drill or workpiece

• Misalignment;
• Loose components;
• Inadequate mounting

• Unpleasant working conditions;
• Potential inaccuracies in drilling

• Check and correct alignment;
• Tighten all components;
• Ensure proper mounting and support

Drill Jamming

Signs: Diamond Drills gets stuck in the material; difficulty in advancing or retracting the drill

• Material swarf build-up;
• Inadequate lubrication;
• Diamond Drills misalignment

• Interrupted drilling process;
• Potential for Diamond Drills breakage

• Clean Diamond Drills regularly;
• Ensure proper lubrication;
• Check and correct Diamond Drills alignment

Sound Fluctuation

Signs: Irregular or intermittent cutting sounds; changes in drilling noise patterns

• Diamond Drills wear;
• Loose components;
• Inconsistent material density

• Inconsistent drilling performance;
• Potential for inaccuracies

• Inspect and replace worn diamond drills;
• Tighten loose components;
• Adjust drilling parameters for material

Diamond Drill Overloading

Signs: Excessive power consumption or increased load on the drilling machine

• Dull diamond drill; Inadequate coolant;
• Material hardness

• Increased operational costs;
• Potential overheating of machine

• Sharpen or replace diamond drill;
• Ensure adequate coolant flow;
• Use a drill suited for the material’s hardness

Slow/ Inefficient Drilling 

Signs: Slow drilling progress; increased time to penetrate material

• Blunt drill edges
• Inadequate drilling speed
• Hard or abrasive material
• Incorrect Drill Specification
• Coolant not adequately reaching the drilling zone
• Incorrect feed rates
• Material core (plug) is stuck inside core drill
• Poor Equipment Maintenance
• Operator Oversight

• Prolonged drilling time;
• Increased wear on diamond drill
• Higher Process Cost
• Loss of Productivity

• Dress the diamond drill
• Adjust drilling speed;

• Select a more suitable Diamond Drills for the material
•  Use Larger (coarser) Diamond
• Use Softer Bond Matrix
• Optimize rpm’s and fee rate
• Try higher RPM’s

Diamond Drill Overheating

Signs: Discoloration or burn marks on the material around the hole

• Excessive friction; Inadequate coolant;
•  Too high drilling speed

• Aesthetic damage to material;
• Potential structural damage

• Reduce drilling speed; Increase coolant flow;
•  Adjust drilling parameters

Diamond Drill Instability

Signs: Chattering or bouncing of the diamond drill

• Unstable drill setup;
• Worn drill bearings or spindle; Misalignment

• Poor hole quality;
•  Potential damage to Diamond Drills or material

• Stabilize drill setup;
•  Replace worn components; Ensure proper alignment

Debris Accumulation

Swarf or debris accumulation around the Diamond Drills or in the hole

• Inadequate chip removal;
• Insufficient coolant flow; Incorrect drill design

• Blocked drilling path;
•  Potential for Diamond Drills overheating

• Improve chip removal; Increase coolant flow;
• Use a drill with appropriate chip removal design

Trouble Starting Hole

Signs: Difficulty in starting the hole; Diamond Drills skidding or slipping on the material surface

• Inadequate surface preparation;
•  Diamond Drills not sharp enough; Incorrect angle of entry

• Inaccurate hole initiation;
• Potential for surface damage

• Prepare surface properly;
• Sharpen or replace diamond drill; Ensure correct angle of entry

Drill Vibrating

Signs: Excessive tool vibration or machine movement

• Imbalanced diamond drill;
• Loose machine components; Uneven work surface

• Reduced drilling accuracy;
• Increased wear on machine and diamond drill

• Balance diamond drill;
• Tighten loose components; Ensure work surface is even and stable

Drilling Heat Buildup

Signs: Unusual or excessive heat in the drill chuck or spindle

• Overworked drill motor;
• Inadequate lubrication; Excessive drilling speed

• Potential damage to drill or machine;
• Reduced lifespan of components

• Allow motor to cool periodically;
• Ensure proper lubrication; Adjust drilling speed

Decline in Drilling Performance

Signs: Reduced cutting speed despite constant machine settings

• Diamond Drills wear;
•  Hardening of the material;
• Inadequate coolant

• Increased drilling time;
• Potential for overheating

• Inspect and replace the diamond drill;
• Adjust coolant flow;
• Review material specifications

Short Drill Life

Signs: Frequent need for Diamond Drills replacement

• Excessive wear rate;
• Unsuitable Diamond Drills material;
• Incorrect drilling parameters

• Increased operational costs;
• Downtime for replacements

• Choose appropriate Diamond Drills material;
• Optimize drilling parameters;
• Regularly inspect diamond drills

Diamond Drill Jammed

Signs: Diamond Drills becomes lodged or jammed in the hole

• Swarf build-up;
• Inadequate hole clearance;
• Material deformation

• Interrupted drilling process;
• Potential for Diamond Drills damage

• Ensure adequate hole clearance;
• Use appropriate Diamond Drills design;
• Regularly clear swarf

Drill Life Inconsistency

Signs: Inconsistent Diamond Drills life across similar operations

• Variable material properties;
• Inconsistent machine calibration;
• Fluctuating operating conditions

• Unpredictable maintenance schedule;
•  Variable drilling performance

• Standardize material selection; Calibrate machines regularly; 
• Monitor and stabilize operating conditions

Excessive Drilling Noise

Excessive noise from the drilling machine

• Worn or damaged machine components; Misalignment;
• Unbalanced load

• Unpleasant working environment;
• Potential for machine damage

• Inspect and replace damaged components;
• Align and balance machine;
• Distribute load evenly

Drill Angle Instability

Difficulty in maintaining the desired drilling angle

• Unstable machine setup; Worn machine components;
• Inadequate operator training

• Inaccurate hole angle;
• Compromised hole integrity

• Stabilize machine setup;
• Replace worn components; Provide adequate training

Diamond Drill Deflection

Increased occurrence of Diamond Drills deflection

• Inadequate drill rigidity; Uneven material density;
•  Incorrect Diamond Drills design

• Inaccurate hole dimensions;
• Potential for off-center drilling

• Use a more rigid drill setup;
• Assess material density;
• Choose the correct Diamond Drills design

Diamond Drill Tube Wear

Visible wear or damage on the drill sides/body

• Abrasive material;
•  Inadequate coolant;
• High feed rate or speed

• Reduced Diamond Drills effectiveness;
• Increased heat generation

• Use diamond drills designed for abrasive materials;
• Ensure proper coolant flow; Adjust feed rate and speed

Feed Rate Issues

Difficulty in controlling Diamond Drills feed rate

• Inconsistent material density;
• Worn machine components;
• Inadequate operator control

• Inconsistent drilling performance;
• Potential for material damage

• Assess material density;
• Maintain machine components; Train operators adequately

Material Bottom Side Deformation

Excessive burring or material deformation at the hole exit

• Too high feed rate;
• Inadequate support for the material;
•  Dull diamond drill

• Poor hole quality;
•  Additional finishing required

• Adjust feed rate;
• Provide adequate material support;
• Sharpen or replace the diamond drill

Diamond Drills Wondering

Diamond Drills “walking” or drifting at the start of drilling

• Uneven starting surface;
• Diamond Drills not perpendicular to material;
•  Inadequate clamping

• Inaccurate hole start;
•  Potential for material damage

• Flatten starting surface;
• Ensure Diamond Drills is perpendicular; Secure material properly

Excessive Wear on One Drill Side

Signs: Excessive wear on one side of the diamond drill

• Misalignment;
• Uneven material hardness;
• Improper Diamond Drills rotation

• Asymmetrical Diamond Drills wear;
• Reduced Diamond Drills life

• Check and correct alignment;
• Assess material properties;
• Ensure proper Diamond Drills rotation

Diamond Drill Overheating

Changes in Diamond Drills coloration (e.g., bluing, yellowing)

• Overheating due to high friction;
•  Inadequate coolant supply
•  Excessive drilling speed
•  Diamond Crystal too Fine for the application
•  Bond Matrix is too High
•  Inappropriate Drill Specification

• Potential loss of Diamond Drills hardness;
•  Reduced cutting efficiency
•  Material Deformation
•  Material Burring, chipping, cracking
•  Diamond section breakage or cracking
•  Drill stops drilling

• Optimize drilling speed;
• Increase coolant flow;
• Monitor Diamond Drills temperature
• Increase RPM’s
• Make sure the RPM’s are recommended for the application
• Use dressing stick to dress the drill
• Consider using diamond drill more optimized for the application

Drilling Depth Issues

Signs: Difficulty in achieving the required hole depth

• Inadequate Diamond Drills length;
•  Material hardening at deeper levels;
•  Diamond Drills deflection

• Incomplete drilling;
•  Inaccurate hole depth

• Use the correct length diamond drill;
• Adjust drilling parameters for depth;
• Ensure drill rigidity

Drilling Torque Variations

Fluctuations in drilling torque or resistance

• Inconsistent material composition;
•  Worn diamond drill; Clutch or gearbox issues

• Inconsistent drilling performance;
• Potential for stalling or jamming

• Assess material consistency;
• Replace worn diamond drills; Service clutch or gearbox

Material Discoloration

Material discoloration around the hole

• Excessive heat generation; Chemical reaction with coolant;
•  Material sensitivity

• Aesthetic or structural material damage;
•  Potential weakening of material

• Adjust drilling parameters;
• Check and replace coolant;
• Assess material sensitivity

Chip Removal Issues

Signs: Increased difficulty in chip removal

• Inadequate flute design; High material ductility;
• Insufficient coolant pressure

• Clogged diamond drill;
•  Reduced drilling efficiency;
• Potential overheating

• Optimize flute design;
• Adjust drilling parameters for ductile materials;
• Increase coolant pressure

Diamond Drills Stalling

Diamond Drills fails to cut or progress through the material

• Diamond Drills wear or damage;
• Material hardness exceeds Diamond Drills capacity;
• Incorrect Diamond Drills type

• Stalled drilling process;
•  Potential for Diamond Drills damage

• Inspect and replace diamond drill;
• Use a Diamond Drills suited for the material hardness;
• Ensure correct Diamond Drills type

Diamond Section Glazed Over

Signs: Unusual or rapid Diamond Drills dulling

• Abrasive material;
•  Inadequate coolant;
•  Incorrect drilling parameters
•  Diamond Crystals too Friable
•  Bond Matrix too High
•  Drilling speed is too High or low
•  Incorrect drilling speed
•  Incorrect drill specification

• Frequent Diamond Drills replacement;
•  Increased operational costs
•  Diamond drill slows down
•  Diamond drill stops drilling altogether
•  Diamond Drill Overheats
•  Possible Material Deformation
•  Material Burring, Chipping, & cracking
•  Possible Diamond Section Breakage

• Select diamond drills designed for abrasive materials;
•  Optimize coolant flow;
•  Adjust drilling parameters

Diamond Drill Suddenly Stops

Sudden increase in drilling noise or vibration

• Diamond Drills or machine component failure;
• Material fracture;
•  Loose fixtures

• Potential for immediate halt in drilling;
• Safety hazard

• Stop drilling immediately;
•  Inspect Diamond Drills and machine;
•  Secure all fixtures

Uneven Wear on Diamond Section

Uneven wear on the drills diamond section surface

• Uneven material hardness;
• Diamond Drills not level with material;
• Inconsistent feed pressure

• Uneven drilling;
• Reduced Diamond Drills life

• Assess material for uniformity;
• Level Diamond Drills with material;
• Apply consistent feed pressure

Diamond Drills “pulls” into the material unexpectedly

• Too aggressive feed rate;
• Diamond Drills design not suited for material;
• Inadequate clamping of material

• Loss of control over drilling;
• Potential for over-drilling or material damage

• Adjust feed rate;
• Select appropriate Diamond Drills design;
• Ensure material is clamped securely

Difficulty in Starting Hole

Difficulty in hole start or Diamond Drills skating on material surface

• Lack of pilot hole or starting point;
• Hard or slippery material surface;
• Worn Diamond Drills tip

• Inaccurate hole placement;
•  Increased time for hole initiation

• Create a pilot hole or use a center punch;
• Assess and prepare material surface;
• Replace or sharpen Diamond Drills tip

Drill Mounting Overheating

Excessive accumulation of heat in the Diamond Drills shank

• High friction in the chuck;
• Over-tightening of the diamond drill;
• Inadequate lubrication in chuck area

• Potential for Diamond Drills or chuck damage;
•  Reduced Diamond Drills life

• Adjust chuck tightness;
• Ensure proper lubrication;
• Monitor and manage friction levels

Wall Smoothness Variability

Inconsistent hole wall smoothness

• Fluctuating feed rate; Diamond Drills vibration;
• Material inhomogeneity

• Variable hole quality;
•  Potential need for post-processing

• Stabilize feed rate;
• Minimize Diamond Drills vibration;
• Assess material for consistency

Edge Sharpness Loss

Diamond Drills unable to retain cutting edge sharpness

• Material abrasiveness; Inadequate cooling;
• Incorrect Diamond Drills material

• Frequent Diamond Drills re-sharpening or replacement;
•  Increased downtime

• Use diamond drills designed for abrasive materials;
• Optimize cooling; Select appropriate Diamond Drills material

Sharp Decline in Drill Performance

Sudden decrease in drilling performance

• Takes lot longer to drill
• Decrease in drilling speed & feed rate
• Sudden material hardness change;
• Diamond Drills reaching end of life

• Slowed drilling progress;
• Potential for Diamond Drills failure

• Clean flutes regularly; Assess material for consistency;
• Monitor Diamond Drills life and replace as needed

Diamond Drills Bending

Diamond Drills bending or flexing during operation

• Excessive length to diameter ratio;
• Inadequate support for diamond drill; High lateral pressure

• Diamond Drills deflection;
• Inaccurate hole dimensions

• Use diamond drills with appropriate length to diameter ratio;
• Ensure Diamond Drills is adequately supported;
• Minimize lateral pressure

Shank or Drill Mount Fracture

Premature shank wear or failure

• Excessive chuck pressure;
• Misalignment in chuck;
• Repeated high-torque scenarios

• Reduced Diamond Drills life;
• Potential for Diamond Drills s lippage or breakage

• Adjust chuck pressure;
• Ensure proper alignment in chuck;
• Monitor and manage torque levels

Loss of Concentricity

Diamond Drills loses concentricity

• Worn spindle or bearings;
• Improper Diamond Drills installation;
• Material side forces

• Hole diameter inconsistency;
•  Reduced drill accuracy

• Service or replace spindle/bearings;
• Ensure proper Diamond Drills installation;
•  Stabilize material during drilling

Increased Diamond Drills side play

• Worn chuck jaws;
•  Overuse or wear of Diamond Drills shank;
•  Misalignment in drill setup

• Reduced precision;
•  Potential for hole deviation

• Replace or adjust chuck jaws;
• Replace worn diamond drills;
• Ensure proper alignment in setup

Intermittent Drilling Action

Diamond Drills exhibits intermittent cutting action

• Intermittent material hardness;
•  Fluctuating feed rate;
• Diamond Drills vibration

• Inconsistent hole quality;
• Potential for material damage

• Assess material for consistency;
• Stabilize feed rate; Minimize Diamond Drills vibration

Excessive coolant consumption

Excessive coolant consumption

• Coolant leaks;
• Inefficient coolant delivery system;
• High evaporation rate

• Increased operational costs;
• Potential for inadequate cooling

• Check for and repair leaks;
• Optimize coolant delivery system;
• Assess coolant type and application

Coolant Foaming

Coolant foaming or discoloration

• Contamination;
• Chemical reaction with materials;
•  Incorrect coolant mixture

• Reduced cooling efficiency;
• Potential for material or tool corrosion

• Identify and remove contaminants;
•  Assess material compatibility;
• Check and adjust coolant mixture

Diamond Drills exhibits premature wear patterns

• Material abrasiveness;
• Inadequate coolant;
• Incorrect drilling parameters

• Reduced Diamond Drills life;
• Increased replacement frequency

• Select diamond drills for abrasive materials;
•  Optimize coolant flow;
• Adjust drilling parameters

Poor Drill Alignment

Difficulty in maintaining Diamond Drills alignment during deep hole drilling

• Diamond Drills  deflection;
• Inadequate machine rigidity;
•  Misalignment in setup

• Hole deviation at depth;
•  Reduced hole accuracy

• Use drill guides or bushings;
• Ensure machine rigidity;
•  Check and correct alignment

Material fuses to the diamond drill

• Excessive heat generation;
• Material ductility;
• Inadequate coolant or feed rate

• Stalled drilling process;
•  Potential for material waste

• Optimize feed rate;
• Use suitable coolant;
•  Select appropriate Diamond Drills material

Oversized Holes

Diamond Drills produces oversized holes

• Diamond Drills wear;
• Material thermal expansion;
•  Diamond Drills wobble

• Hole size inconsistency;
•  Reduced dimensional accuracy

• Replace worn diamond drills;
• Control material temperature;
• Check and correct Diamond Drills mounting

undersized holes

Diamond Drills produces undersized holes

• Incorrect Diamond Drills sizing;
• Material compression;
• Inadequate cutting pressure

• Hole size inconsistency;
•  Potential for rework or scrap

• Verify Diamond Drills size;
• Assess material properties;
• Adjust cutting pressure

Drill Mounting Deformation

Diamond Drills shank wear or deformation

• Excessive chuck pressure;
• Misalignment in chuck;
•  Repeated high-torque scenarios

• Reduced Diamond Drills life;
• Potential for Diamond Drills slippage or breakage

• Adjust chuck pressure; Ensure proper alignment in chuck;
• Monitor and manage torque levels

Inconsistent drilling speed

Inconsistent drilling speed despite constant settings

• Variable voltage supply; Worn or damaged motor;
• Mechanical issues in drill feed mechanism

• Inconsistent drilling performance;
•  Potential for reduced precision

• Check and stabilize power supply;
• Service or replace motor;
• Inspect and repair feed mechanism

Excessive Dust Generation

Excessive dust or debris generation during drilling

• Inadequate dust extraction;
• High material brittleness;
•  Incorrect Diamond Drills type

• Poor visibility and working conditions;
•  Potential health hazards

• Improve dust extraction system;
•  Adjust drilling parameters;
•  Select appropriate Diamond Drills type

Difficulty Removing Diamond Drill from Material

• Material adhesion; Vacuum effect in the hole;
•  Mechanical issues with drill retraction

• Difficulty in Diamond Drills removal;
• Potential for Diamond Drills or material damage

• Apply release agents;
• Ensure proper hole ventilation;
•  Inspect and repair retraction mechanism

Unusual wear or damage on non-cutting parts of the diamond drill

• Contact with debris or workpiece;
•  Handling or storage issues;
• Accidental collisions

• Reduced Diamond Drills life;
• Potential for inaccuracies in drilling

• Protect Diamond Drills during non-use;
• Ensure proper handling and storage;
•  Avoid collisions

frequent recalibration Required

Diamond Drills requires frequent recalibration or adjustment

• Inconsistent material hardness;
• Thermal expansion of drill or material;
•  Wear and tear of drill components

• Increased downtime for recalibration;
• Potential for reduced accuracy

• Assess material consistency;
• Monitor temperature effects;
• Regularly inspect and maintain drill components

Difficulty in achieving straight hole walls

• Diamond Drills deflection; Inadequate machine stability;
• Uneven material density

• Hole wall irregularities;
•  Reduced hole quality

• Use more rigid drill setup;
•  Enhance machine stability;
• Assess and accommodate material density

Rough Surface at Entrance or Exit

Diamond Drills produces a rough hole entrance or exit

• Inadequate Diamond Crystal Sharpness & Exposure;
• High feed rate
• Material chipping or flaking
• Diamond Crystal too Coarse or Fine
• Drilling Speed too High or Low
• Insufficient Coolant reaching the drilling zone
• Incorrect diamond drill application

• Poor hole quality
• Potential for additional finishing processes
• Process Inconsistency
• Loss of Productivity
• Higher Cost
• Scrap Parts

• Dress the Diamond Drill
• Adjust feed rate
• Optimize drilling parameters for material
• User Finer diamond grit size
• Optimize Diamond Concentration
• Use Softer Bond Matrix
• Use Different Bond Type
• Make Sure Coolant is reaching drilling zone
• Make sure the material is supported and does not move

Material Delamination

Material layers separate or delaminate during drilling

• High drilling pressure;
• Inadequate support for layered materials;
•  Diamond Drills not suited for layered materials

• Layer separation;
•  Compromised material integrity

• Reduce drilling pressure; Provide adequate support;
• Use diamond drills designed for layered materials

Tapered Hole

Diamond Drills produces a tapered hole

• Diamond Drills not perpendicular to material;
• Worn or damaged diamond drill;
•  Inconsistent material density

• Hole dimension inconsistencies;
• Reduced hole quality

• Ensure Diamond Drills is perpendicular;
•  Replace worn or damaged diamond drills;
•  Assess material density

Bell Mouthed Hole

Diamond Drills produces a bell-mouthed hole

• Excessive Diamond Drills wear at the tip; Inadequate support for material;
•  Diamond Drills wobbling

• Hole diameter inconsistency;
•  Compromised hole geometry

• Replace or sharpen diamond drill;
• Ensure material is adequately supported;
•  Stabilize Diamond Drills to prevent wobble

Difficulty Maintaining Consistent Hole Depth

Difficulty in maintaining consistent hole depth

• Inconsistent feed rate;
• Fluctuating Diamond Drills pressure;
• Material compressibility

• Variable hole depth;
•  Potential for incomplete drilling

• Stabilize feed rate; Apply consistent pressure;
•  Account for material compressibility

Holes with Rough Interior Surface

Diamond Drills produces a hole with a rough interior surface

• Blunt diamond drill;
• High feed rate;
• Abrasive material

• Poor hole interior finish;
•  Potential for additional processing

• Sharpen or replace diamond drill;
• Adjust feed rate;
• Use diamond drills suitable for abrasive materials

Material Burning

Material burns or smokes during drilling

• Excessive friction; Inadequate coolant;
•  Too high drilling speed

• Potential thermal damage to material;
•  Safety hazard

• Reduce drilling speed; Increase coolant flow;
•  Monitor and adjust drilling parameters

Irregular Shape Holes

Diamond Drills produces a hole with an irregular shape

• Diamond Drills deflection;
•  Material inhomogeneity;
• Inadequate clamping of material

• Compromised hole geometry;
•  Reduced precision

• Minimize Diamond Drills deflection;
• Assess material uniformity;
•  Ensure material is clamped securely

Excessive Wear on Drills Body

Excessive tool wear on the diamond drill’s non-cutting areas

• Contact with workpiece during retraction;
•  Abrasive debris in the work area;
•  Inadequate tool storage

• Reduced tool life;
• Potential for tool failure

• Avoid contact with workpiece during retraction;
• Keep work area clean; Store tools properly

hole with a conical entrance

Diamond Drills produces a hole with a conical entrance

• Diamond Drills not entering material straight;
• Inadequate material surface preparation;
•  Diamond Drills tip wear

• Inaccurate hole entrance geometry;
• Potential for rework

• Ensure straight Diamond Drills entry;
• Prepare material surface properly;
•  Inspect and maintain Diamond Drills tip

Drill Stuck Inside Chuck or Collet

Difficulty in Diamond Drills removal after drilling

• Material contraction or warping;
•  Vacuum effect in the hole;
•  Diamond Drill expansion due to heat

• Stuck diamond drill;
•  Potential for tool or material damage

• Allow material and Diamond Drills to cool;
•  Ensure proper hole ventilation;
• Apply release agents if necessary

Hole with a stepped profile

Diamond Drills produces a hole with a stepped profile

• Diamond Drills retraction and re-entry;
•  Material hardness variation;
•  Inconsistent feed rate

• Stepped hole profile;
•  Compromised hole integrity

• Avoid unnecessary Diamond Drills retraction;
•  Assess material for hardness variation;
•  Stabilize feed rate

Shank Corrosion

Diamond Drills shank shows signs of corrosion or rust

• Exposure to corrosive substances;
•  Inadequate tool maintenance;
• High humidity storage conditions

• Reduced tool life;
• Potential for tool failure

• Avoid exposure to corrosive substances;
•  Maintain tools properly;
• Store in low humidity conditions

Chipping at Hole Exit

Diamond Drills produces a hole with a rough or chipped exit

• Sudden material exit support loss;
•  High exit feed rate;
• Brittle material

• Poor hole exit quality;
•  Potential for material damage

• Support material at exit point;
• Reduce feed rate at hole exit;
• Adjust drilling parameters for material

Diamond Drill Uneven Exposure

Diamond Drills shows uneven diamond exposure

• Uneven wear;
• Inconsistent diamond distribution;
•  Material abrasiveness

• Inconsistent cutting performance;
• Reduced Diamond Drills life

• Ensure even Diamond Drills wear;
• Select diamond drills with consistent diamond distribution
•  Adjust for material abrasiveness

Over Exposed Diamond Crystals

Signs: Diamond protrude from bond material within minimal support its bond matrix. Visible amount of diamond pullout

1.  Inadequate bond matrix hardness
2.  Excessive wear rate of the bond matrix
3.  Improper bond matrix composition for the material being drilled.

• Increased risk of diamond loss;
• Reduced diamond drill life and efficiency.

1. Select a diamond drill with a bond matrix of appropriate hardness for the material
2. Optimize drilling parameters to reduce wear rate of the bond matrix
3. Ensure the bond matrix composition is suitable for the material and drilling conditions.

Excessive Premature Diamond Loss

Signs: Diamond section shows signs of high amount of lost diamond crystal from the bond matrix

1. Excessive drilling pressure.
2. Impact with very hard or abrasive materials.
3. Inadequate bond hardness relative to the material being drilled.

• Reduced cutting efficiency;
•  Increased wear and tear on the diamond drill.

1. Adjust drilling pressure to appropriate levels.
2. Assess and match the diamond drill specifications with the material hardness.
3. Select a diamond drill with a bond hardness that is appropriate for the material.

Crushed Diamond Crystals

Signs: Diamond crystals in bond show signs of high amount of fracture

1. Excessive drilling pressure
2. Impact with very hard or abrasive materials
3. Inadequate bond hardness relative to the material being drilled.

• Reduced cutting efficiency
• Increased wear and tear on the diamond drill

1. Adjust drilling pressure to appropriate levels
2. Assess and match the diamond drill specifications with the material hardness
3. Select a diamond drill with a bond hardness that is appropriate for the material.

Diamond Crystal Premature Loss of Sharp Point

Signs: Diamond crystals premature glazing (loss of sharp point) and poor exposure from bond matrix

1. Premature diamond wear
2. Inappropriate drilling parameters for the material
3. Insufficient diamond protrusion from the bond.

• Slower drilling process;
• Increased wear on the diamond drill and machinery.

1.  Monitor and adjust for diamond wear
2. Tailor drilling parameters to the specific material
3. Check and ensure adequate diamond protrusion for effective cutting

Diamond Drill Stops Drilling

Diamond Drills experiences sudden loss of cutting ability

• Diamond grit pull-out;
• Bond material failure;
• Impact or excessive load

• Immediate halt in drilling progress;
• Potential for Diamond Drills damage

• Inspect Diamond Drills for damage;
• Select diamond drills with appropriate bond material;
• Avoid excessive loads

Wider Hole on entrance & exit

Diamond Drills produces a hole with a double-diameter profile

•  Diamond Drills size change during operation;
• Material layer hardness change; Diamond Drills slippage

• Hole dimension inconsistency;
• Compromised hole integrity

• Ensure consistent Diamond Drills size;
•  Assess material layers for hardness
• Secure Diamond Drills properly

89

Diamond Drills Loss of Profile

Diamond Drills shows signs of abnormal flattening or rounding

• Excessive pressure;
• Soft bond material for given material;
• High temperature during drilling

• Reduced cutting efficiency;
• Premature Diamond Drills wear

• Adjust drilling pressure;
• Select bond material suited for the material;
• Manage drilling temperature

90

Excessive Drilling Noise

Diamond Drills produces excessive noise during retraction

• Material snagging on diamond drill;
• Inadequate retraction speed;
• Diamond Drills misalignment

• Unpleasant noise;
• Potential for Diamond Drills or material damage

• Ensure smooth Diamond Drills path;
• Adjust retraction speed;
• Align Diamond Drills properly

91

Diamond Drill Slipping

Diamond Drills experiences intermittent engagement with the material

• Diamond Drills bouncing;
• Inconsistent material surface;
• Worn Diamond Drills bearings or spindle

• Inconsistent drilling;
• Potential for hole defects

• Stabilize Diamond Drills engagement;
• Flatten material surface;
• Service or replace bearings or spindle

Tapered Hole

Diamond Drills produces a hole with a tapered exit

• Diamond Drills withdrawal angle;
• Inadequate support at hole exit;
•  Material deformation

• Hole exit dimension inconsistency;
• Reduced hole quality

• Control Diamond Drills withdrawal angle;
• Support material at hole exit;
• Account for material deformation

93

Diamond Section Coming Off

Diamond Drills shows signs of solder failure or diamond section coming off

• Excessive heat;
• Mechanical shock;
• Improper Diamond Drills use

• Potential for segment detachment;
• Compromised drilling performance

• Manage heat generation;
• Avoid mechanical shocks;
• Use Diamond Drills as intended

Hole Waviness

Diamond Drills produces a hole with an irregular or wavy profile

• Diamond Drills vibration;
• Inconsistent feed rate;
• Material inhomogeneity

• Hole profile irregularity;
• Compromised hole quality

• Minimize Diamond Drills vibration;
• Stabilize feed rate;
• Assess material for consistency

94

Material Burring

Signs: Raised edges or small fragments of material at the hole entrance or exit

1. Dull or damaged diamond drill edges.
2. Excessive feed rate or pressure.
3. Inadequate support for the material at the drilling point.
4. Diamond drill vibration or instability.
5. Material properties such as ductility or softness.
6. Inadequate or improper use of coolant.

• Compromised hole quality;
•  Potential for additional finishing work or material damage.
• Reduced quality of hole finish; Potential for increased post-processing work.

1. Inspect and replace or sharpen diamond drills as necessary.
2. Adjust feed rate and pressure to appropriate levels.
3. Provide stable support for the material during drilling.
4. Stabilize the drill setup to minimize vibration.
5. Select diamond drills and drilling parameters suitable for the material’s properties.
6. Optimize coolant flow and type to enhance cutting conditions.

Material Scratches

Sings: Visible scratches or grooves on the surface of the material around the drilled hole

1.  Foreign particles between the diamond drill and material.
2. Diamond drill misalignment or wobbling.
3.  Rough handling or improper storage of the diamond drill causing edge damage.

• Aesthetic damage to the material;
• Potential for reduced structural integrity.

1. Ensure a clean working environment and clean material surface.
2. Check and correct diamond drill alignment.
3. Handle and store diamond drills properly to prevent damage.

Material Smearing

Signs: Material residue adhering to the sides of the drilled hole

1. Excessive heat generation during drilling.
2. Inadequate or improper use of coolant.
3. Soft or ductile material that tends to smear.

• Compromised hole quality;
• Potential for inaccurate hole dimensions and increased finishing work.

1. Optimize drilling parameters to manage heat.
2. Ensure proper coolant flow and application.
3. Select diamond drills and drilling parameters suitable for the material’s properties.

Material Pull Out

Sings: Material fragments or chunks dislodged from the hole walls

•  Abrupt or excessive pressure at the start of drilling.
• Diamond drill not properly aligned or secured.
• Surface irregularities or material brittleness.

• Compromised surface finish and structural integrity of the hole entrance;
• Potential for material waste or rework.

1. Gradually apply pressure and start drilling at a reduced speed.
2. Ensure diamond drill alignment and secure clamping.
3. Inspect material surface and prepare adequately before drilling.

Top Sided Chipping

Sings: Uneven or rough edges around the hole entrance

1. Abrupt or excessive pressure at the start of drilling.
2. Diamond drill not properly aligned or secured.
3. Surface irregularities or material brittleness.
4. Diamond drill vibration or instability.
5. Inadequate material support at the drilling point.
6. Incorrect or worn diamond drill for the material type.

• Compromised surface finish and structural integrity of the hole entrance;
• Potential for material waste or rework.
• Reduced quality of hole entrance;
• Potential for additional processing or finishing work.

1. Gradually apply pressure and start drilling at a reduced speed.
2. Ensure diamond drill alignment and secure clamping.
3. Inspect material surface and prepare adequately before drilling.
4. Stabilize the drill setup to minimize vibration.
5. Provide stable support for the material at the drilling point.
6. Select and use the correct, sharp diamond drill for the material.

Bottom Side Chipping

Sings: Chipping or flaking on the exit side of the drilled hole

1. Sudden release of pressure as the diamond drill exits the material.
2. Lack of supporting material or backing plate at the exit point.
3. Excessive feed rate or pressure as the diamond drill completes the hole.
4. Diamond drill vibration or wobbling.
5. Material brittleness or susceptibility to chipping.
6. Inadequate or improper use of coolant.

• Compromised finish and integrity of the hole exit;
•  Potential for material waste or rework.
• Reduced quality of hole finish;
•  Potential for additional processing or finishing work.

• Gradually reduce pressure and feed rate before the diamond drill exits the material.
• Use a backing plate or support material to provide stability at the exit point.
• Monitor and adjust drilling parameters as the diamond drill nears the exit side.
• Stabilize the drill setup to minimize vibration.
• Select diamond drills and drilling parameters suitable for the material’s properties.
• Optimize coolant flow and type to enhance cutting conditions.

Excessive Backside Chipping

Chipping or flaking on the exit side of the drilled hole

1. Sudden release of pressure as the diamond drill exits the material.
2. Lack of supporting material or backing plate at the exit point.
3. Excessive feed rate or pressure as the diamond drill completes the hole.

• Compromised finish and integrity of the hole exit;
• Potential for material waste or rework.

1. Gradually reduce pressure and feed rate before the diamond drill exits the material.
2. Use a backing plate or support material to provide stability at the exit point.
3. Monitor and adjust drilling parameters as the diamond drill nears the exit side.

Consistently Spaced Chipping

Signs: Chipping or flaking observed predominantly on one side of the drilled hole

1. Regular imperfections or inclusions in the material.
2. Cyclic loading or vibration during drilling.
3. Periodic engagement of damaged or irregular diamond drill segments.

• Compromised hole integrity and finish;
• Potential for reduced structural strength of the hole.

1. Assess material quality and plan drilling to avoid imperfections.
2. Stabilize the drilling process to minimize vibration.
3. Inspect the diamond drill for damage and ensure uniform segment distribution.

One Sided Chipping

Sings: Chipping or flaking observed predominantly on one side of the drilled hole

1. Diamond drill misalignment or tilt.
2. Uneven material support or surface.
3. Inconsistent pressure or side loading during drilling.

• Compromised hole integrity and aesthetics;
• Potential for material waste or rework.

1. Ensure proper diamond drill alignment and machine calibration.
2. Provide even and stable support for the material.
3. Apply consistent and straight drilling pressure.

Diamond Drill Gummed Up

1. Accumulation of cutting debris in the diamond segments.
2. Inadequate or improper use of coolant.
3. Drilling soft, gummy materials that clog the diamond drill.

• Slower drilling process;
• Increased effort and time required for drilling.

1. Clean the diamond drill regularly to remove debris.
2. Ensure proper coolant flow and application.
3. Use diamond drills designed for specific materials to reduce clogging.

Nick of Diamond Section Chipped Out

1. Impact with hard inclusions or foreign objects.
2. Excessive force or pressure.
3. Diamond drill fatigue or overuse.

• Reduced cutting efficiency;
• Potential for uneven drilling or further diamond drill damage.

1. Inspect material for hardness and inclusions before drilling.
2. Apply appropriate force and pressure.
3. Regularly inspect diamond drills for wear and replace as necessary.

Crack in Diamond Section

Sings: Visible cracks in the diamond section of the diamond drill

1. Mechanical stress or impact.
2. Thermal shock due to rapid temperature changes.
3. Material defects or inclusions in the diamond section.

• Reduced structural integrity of the diamond drill;
• Potential for diamond section failure.

1. Avoid excessive force or pressure during drilling.
2. Manage temperature changes and ensure proper coolant use.
3. Inspect diamond drills for material quality and avoid using bits with visible defects

Drill Tube Fractured From Collet

Fracture or separation at the brazed joint between the drill tube and brass collet

1. Inadequate brazing process or material.
2. Excessive mechanical stress or torque.
3. Thermal stress due to extreme temperature changes.

• Loss of drill stability;
• Immediate halt in drilling;
• Potential for damage to the workpiece or drilling equipment.

1. Ensure high-quality brazing with appropriate materials and techniques.
2. Apply torque within the specified limits.
3. Avoid rapid temperature changes during drilling operations.

Difficulty in screwing or unscrewing Drill

Difficulty in screwing or unscrewing the diamond drill from the machinery

1. Deformation or damage to the collet thread
2. Material build-up or galling in the threads
3. Cross-threading or misalignment during attachment.

• Increased setup time;
• Potential for thread damage or inability to properly secure the drill tube.

1. Inspect and repair any damaged threads
2. Clean and maintain the threads to prevent material build-up.
3. Ensure proper alignment and careful handling when attaching or detaching the drill tube.