UHMW vs. Delrin
UHMW vs. Delrin
(OP)
I am currently designing a mill fixture. The application of the component that I'm making this particular material selection for will be to hold the flange of a part during a drill operation. It slides up to the flange after the part is loaded onto the fixture, and is then held into place by three 3/4" bolts. Dimensions are 1" X 5" x 59".
Must be:
1) Lightweight so that 1 person can lift and bolt into place
2) Resistant to vibration fatigue
3) Easily machinable
4) Cheap
5) Since it will be on shop floor, it must not break if something bangs up against it.
I've narrowed down my options to UHMW Polyethylene and Delrin and wanted to get some input from people that have worked with both. Is the high cost of delrin worth it? What are some advantages/disadvantages of each?
Thanks in advance.
-Rich
Must be:
1) Lightweight so that 1 person can lift and bolt into place
2) Resistant to vibration fatigue
3) Easily machinable
4) Cheap
5) Since it will be on shop floor, it must not break if something bangs up against it.
I've narrowed down my options to UHMW Polyethylene and Delrin and wanted to get some input from people that have worked with both. Is the high cost of delrin worth it? What are some advantages/disadvantages of each?
Thanks in advance.
-Rich





RE: UHMW vs. Delrin
How did you manage to narrow down the options to UHMW or Delrin?
Neither of those materials are particularly well suited for machining fixtures. They are hydroscopic, and will thus change dimensionally with changes in moisture.
They both have relatively high coefficients of thermal expansion.
Neither are particularly rigid.
RE: UHMW vs. Delrin
RE: UHMW vs. Delrin
How do the impact resistances of these materials compare?
RE: UHMW vs. Delrin
RE: UHMW vs. Delrin
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: UHMW vs. Delrin
RE: UHMW vs. Delrin
RE: UHMW vs. Delrin
RE: UHMW vs. Delrin
When I want plastic, I usually specify Delrin because our machinists like it. I figure I get a cheaper part. I only specify other plastics when the requirement is tricky, and I need high performance of some sort.