Hole machining tooling
◆ Measures to eliminate machining fault of solid drill bits, brazing drill bits
Faults Causes Causes

Flank
 Inappropriate cutting speed
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If abnormal wear happens with central part, increase cutting speed by 10% in standard conditions.
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If abnormal wear happens with cylinder, decrease cutting speed by 10% in standard conditions.
Improper cutting fluid
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Confirm whether filter device is suitable (suitable for #150 reticulation filter)
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Use cutting fluid with good lubrication property (increase dilution times)
Margin Inappropriate cutting speed
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Decrease cutting speed by 10%
Regrinding is not in time, regrinding volume is not enough
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Advance regrinding time
The rigidity of machine tools, work pieces is not enough
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Change to clamping method with enough rigidity
The rigidity of drill bit is not enough
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Try to shorten overhanging volume of drill bit
Improper cutting fluid
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Confirm whether filter device is suitable)
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Use cutting fluid with good lubrication property (increase dilution times)
Discontinued cutting when cutting-in and drilling through.
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Make the cut-in surface, drill-through plane level.
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Decrease cut-in feeding, drill-through feeding by about 50%

Chisel edge
(central part
of drill bit's
cutting edge)
The rigidity of drill bit is not enough
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Try to shorten overhanging volume of drill bit
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When feeding is at the side of lower limit in standard cutting conditions, increase cut-in feedingp
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Before drilling, use drill bit bush, center drill bit to drilling center hole
The rigidity of machine tools and work pieces is not enough
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Change to clamping method with enough rigidity
Improper cut-in surface
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Mark cut-in plane level
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Tooling material is too hard
High hardness of work pieces
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Decrease feeding by 10%
Improper passivation
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onfirm whether chamfer passivation reaches the central part of cutting edge
Radial cutting edge The rigidity of drill bit is not enough
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ecrease the drilling speed by 10%l
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When feeding is at the side of lower limit in standard cutting conditions, increase cut-in feeding
Insufficient installation precision of drill bit
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Confirm deflection precision when installing drill bit; (under 0.03mm)
The rigidity of machine tools, work pieces is not enough
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Change to clamping method with enough rigidity
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Decrease cut-in feeding and drill bit-through feeding
Improper passivation
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Confirm whether passivation chamfer reaches the cylindrical part of cutting edge
Margin The rigidity of machine tools, work pieces is not enough
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Change to clamping method with enough rigidity
The rigidity of drill bit is not enough
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Try to shorten overhanging volume of drill bit
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Use drill bit bush and center drill bit to process drill bit center hole before drilling.
Regrinding is not in time, regrinding volume is not enough
●
dvance regrinding time
Discontinued cutting when cutting-in and drilling through.
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Make the cut-in surface,drilling-through plane level.
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Decrease cut-in feeding, drill bit-through feeding by about 50%
Breaking Easy to produce edge chipping and abnormal wear
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Confirm whether passivation chamfer reaches the cylindrical part of cutting edge
Chip jammed
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Cutting speed is low
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Cutting edge is not sharp
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Tooling material is not appropriate
Insufficient rigidity of machine tools
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Mark cut-in plane level
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Tooling material is too hard
Bad hole precision
 The rigidity of machine tools, work pieces is not enough
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Change to clamping method with enough rigidity
Insufficient installation precision of drill bit
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Confirm deflection precision when installing drill bit; (under 0.03mm)
Chip jammed
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Restudy cutting conditions
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。Increase output pressure of cutting fluid
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Adopting stepping drilling
Improper grinding precision
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Confirm accuracy to profile of drill bit point
Elongated chip Improper cutting conditions
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ncrease feeding by 10% in standard conditions
Improper passivation
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Make appropriate passivation
Small and large edge chipping happen with cutting edge
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Decrease drilling speed by 10%