THREADING SYSTEMS - JEL - 05/2008 - Komet
THREADING SYSTEMS - JEL - 05/2008 - Komet
THREADING SYSTEMS - JEL - 05/2008 - Komet
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Problems – causes – solutions – thread milling tools<br />
Problem Cause Solution<br />
Chips packed or glued<br />
at the thread profile<br />
- Poor coolant<br />
- Improve coolant situation (i.e. add flood coolant,<br />
lateral flute coolant supply for through<br />
holes)<br />
- Add coolant flutes on shank<br />
Thread go-gage<br />
doesn’t fit<br />
- Thread too small<br />
- Chips in thread<br />
- Reduce tool radius in offset register<br />
- Improve coolant<br />
Thread is getting<br />
tapered<br />
- Poor tool clamping<br />
- Thread milling feed<br />
too high<br />
- Improve tool holding (i.e. shrink fit holders)<br />
- Reduce thread milling feed<br />
- radial cut division<br />
Erratic tool wear<br />
- Tool run out too high - Use better tool holders (i.e. shrink fit holders)<br />
- Check material for homogeneity<br />
Chippage,<br />
tool breakage<br />
- Feed rate thread<br />
milling too high<br />
- Vibrations<br />
- Reduce thread milling feed<br />
- Check tool holder (don’t use modular systems!!)<br />
Change feeds and speeds<br />
Poor thread surface<br />
- Tool overhang too long<br />
- Non-suitable tool for<br />
this application<br />
- Check part clamping an and fixture. Use multiple<br />
cuts when part is clamped weak.<br />
- Reduce cutting speed, increase feed/tooth,<br />
prefer conventional milling<br />
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