Minimum wall thickness for machining a Delrin bushing? 1

[jessegreen]

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]

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


Mike Halloran
Stratford, CT, USA

 

[Tmoose]

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]

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/qu...DF/General/QUA541_BlueBook_1_27_16_lowres.pdf

________________________________________
Mitsubishi Chemical Advanced Materials

http://www.mcam.com

 

[dhengr]

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.