1 - Komet Scandinavia AB

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JEL® Drill Thread Milling Tool
Problems possible causes solutions
Chips packed or glued at the thread profile
• poor coolant
improve coolant (i.e. add flood coolant, lateral flute coolant supply for through holes)
add coolant flutes flutes on shank
Thread go-gage doesn’t fit
• thread too small reduce tool radius in offset register
• chips in thread improve coolant
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Thread is getting tapered
• poor tool clamping improve tool holding (i.e. shrink fit holders)
• thread milling feed too high reduce thread milling feed
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Erratic tool wear
• tool run out too high use better tool holders (i.e. shrink fit holders)
Counterbore chips are winding around the tool
• chamfer feed too low increase chamfer feed
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Loud drilling noise (especially towards the final drilling depth)
• chip problem
reduce drill feed rate
use tool with coolant through
add peck cycle
Tool breakage while drilling (especially in long chipping material)
• chip problem
reduce drill feed rate
use tool with coolant through
add peck cycle (multiple pecks)
Chips glued up in the flutes
• poor coolant
improve coolant situation
use tool with coolant through
use coated tool
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Chippage,tool breakage while thread milling
• feed rate thread milling too high check that the chip grooves are free of chips after the boring operation
• vibrations reduce feed rate (check whether NC feeds relate to centre point or external track)
Poor thread surface (harmonics)
• vibrations
check tool holder (do not use modular systems !)
check workpiece clamping and fixture. Where the clamping set-up is unstable introduce a distribution
of the cutting force.
reduce cutting speed
increase tooth feed rate
introduce distribution of cutting force
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Important: See chapter 9 for more application details and safety notes!
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