Minimum wall thickness for machining a Delrin bushing?

Question

Minimum wall thickness for machining a Delrin bushing?

jessegreen (Mechanical)

(OP)

23 Apr 19 21:52

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.

MikeHalloran (Mechanical) · Answer 1 · 2019-04-25 04:07:03

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

Mike Halloran
Stratford, CT, USA

Tmoose (Mechanical) · Answer 2 · 2019-04-26 16:50:45

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.

mighoser (Aerospace) · Answer 3 · 2019-05-01 18:42:16

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.

https://media.mcam.com/fileadmin/quadrant/document...

________________________________________
Mitsubishi Chemical Advanced Materials
www.mcam.com

dhengr (Structural) · Answer 4 · 2019-05-01 21:35:20

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.

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Minimum wall thickness for machining a Delrin bushing?