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DELRIN

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jon b:
Not sure if this is the correct place for this post ?
Looking for advise on cutting Acetal / Delrin 12.5 mm thick . I im getting reasonable results at 20mm per second at 20,000 rev per minute 3 passed last pass .5 offset with a 6mm twin flute bit but Still minor chatter marks on the edge. The work piece is held down well so maybe a different cutter or feeds and speeds need adjusting ?

ger21:
What kind of machine is this?

That's very slow for 20,000 rpm with a 2 flute tool.

jon b:
Hi Gerry
im using a machine supplied from a manufacturer in Poland image attached. A robust machine that has proved to make money so far . I guess this is a learning curve , checking out high rpm slow feeds was a starting point i need to find the sweet spot for this material

reuelt:

--- Quote from: jon b on January 28, 2019, 07:01:50 AM ---Not sure if this is the correct place for this post ?
Looking for advise on cutting Acetal / Delrin 12.5 mm thick . I im getting reasonable results at 20mm per second at 20,000 rev per minute 3 passed last pass .5 offset with a 6mm twin flute bit but Still minor chatter marks on the edge. The work piece is held down well so maybe a different cutter or feeds and speeds need adjusting ?

--- End quote ---
Too slow
Use calculator @
https://pub.pages.cba.mit.edu/feed_speeds/
Delfin chipload is listed there too.

(sorry calculation is in imperial unit)

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