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1 - Komet Scandinavia AB

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JEL® Thread Milling Tool<br />

1.<br />

Problems possible causes solutions<br />

Chips packed or glued at the thread profile<br />

• poor coolant<br />

improve coolant (i.e. add flood coolant, lateral flute coolant supply for through holes)<br />

add coolant flutes flutes on shank<br />

1<br />

2<br />

2.<br />

Thread go-gage doesn’t fit<br />

• thread too small reduce tool radius in offset register<br />

• chips in thread improve coolant<br />

3<br />

3.<br />

Thread is getting tapered<br />

• poor tool clamping improve tool holding (i.e. shrink fit holders)<br />

• thread milling feed too high reduce thread milling feed<br />

4<br />

5<br />

4.<br />

Erratic tool wear<br />

• tool run out too high use better tool holders (i.e. shrink fit holders), check material for homogeneity<br />

6<br />

5.<br />

Chippage, tool breakage<br />

• feed rate thread milling too high reduce thread milling feed<br />

• vibrations check tool holder (don’t use modular systems!!), change feeds and speeds<br />

7<br />

6.<br />

Poor thread surface<br />

• tool overhang too long check part clamping an and fixture.<br />

Use multiple cuts when part is clamped weak<br />

• non-suitable tool for this application reduce cutting speed, increase feed/tooth,<br />

prefer conventional milling<br />

8<br />

9<br />

Important: See chapter 9 for more application details and safety notes!<br />

49

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