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?
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.
Jessegreen:
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.
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RE: Minimum wall thickness for machining a Delrin bushing?
Mike Halloran
Stratford, CT, USA
RE: Minimum wall thickness for machining a Delrin bushing?
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?
https://media.mcam.com/fileadmin/quadrant/document...
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Mitsubishi Chemical Advanced Materials
www.mcam.com
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 generally tend to part them off onto a peg or hook to avoid picking the part up and crushing it.
Hope this helps👍
Tim
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