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Minimum wall thickness for machining a Delrin bushing?

Minimum wall thickness for machining a Delrin bushing?

Minimum wall thickness for machining a Delrin bushing?

I want to machine a Delrin bushing for a 0.44" diameter shaft. My current design has a hole of 0.45" diameter and a wall thickness of 1/8 inch. Can Delrin handle this machining? Thank you.

RE: Minimum wall thickness for machining a Delrin bushing?

Yes. Use super sharp tools, and sharpen them or slow down if you smell vinegar.

Mike Halloran
Stratford, CT, USA

RE: Minimum wall thickness for machining a Delrin bushing?

Are you gripping the OD and boring the Ø.45 as a through hole?
If so, I'd expect the bushing bore will be 3 or 4 lobed when it is removed from he chuck.
A collet would be better.

I'd start with a longer piece of solid stock, bore the ID ( blind hole) and turn the OD, then "part" the finished bushing off the stock.

RE: Minimum wall thickness for machining a Delrin bushing?

You need to determine the operating PV to see if Delrin (POM-H) can handle this application. Then you need to determine total running clearance. See link below for design guide. Since your bushing is small I’d step up to a better material like Techtron HPV. Won’t be much more $$ and will last much longer and easier to machine thin sections.


Mitsubishi Chemical Advanced Materials

RE: Minimum wall thickness for machining a Delrin bushing?

Why not pre-bore the bushing with plenty of wall thickness. Then, press it into its housing and do the final boring, with the material under compression and well supported.

RE: Minimum wall thickness for machining a Delrin bushing?

I have machined parts with a wall thickness of around 0.5mm at my company in plastics such as nylon and acetal. Best method is to take light cuts when turning/boring to avoid too much heat build up in material.

I generally tend to part them off onto a peg or hook to avoid picking the part up and crushing it.

Hope this helps👍



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