Plastic Plain Bearings
Plastic Plain Bearings
(OP)
All,
What is the most cost effective material for a simple plain roller bearing? I have looked at UHMW Polyethylene, but I think there is a better plastic out there at a lower cost. The RPMs and load are very low.
Regards,
Rich.....
What is the most cost effective material for a simple plain roller bearing? I have looked at UHMW Polyethylene, but I think there is a better plastic out there at a lower cost. The RPMs and load are very low.
Regards,
Rich.....
Richard Nornhold, PE





RE: Plastic Plain Bearings
UHMW is difficult to machine accurately. Its low friction coefficient and wear resistance make for decent plain bearings, especially if a little liquid is available.
Delrin is not terribly expensive, has good strength and tribological qualities, and is very easy to machine.
It would help to know some numbers, like actual load and speed, and the dimensions of the rollers you have already tried.
Mike Halloran
Pembroke Pines, FL, USA
RE: Plastic Plain Bearings
RE: Plastic Plain Bearings
I had meant to say a plain bearing for rotary application. Sorry for the confusion.
Regards,
Rich.....
Richard Nornhold, PE
RE: Plastic Plain Bearings
The loading is less then fifty pounds and the speed is less then 25 RPM.
Regards,
Rich......
Richard Nornhold, PE
RE: Plastic Plain Bearings
If you can comeback with a little more information about size and environment there should be some other choices.
RE: Plastic Plain Bearings
The OD is 3/4" and the ID is 13/64". The shaft is regular Hot Rolled Steel and is 3/16" in Diameter. Environment is dry with no moisture and/or lubrication.
Regards,
Rich.....
Richard Nornhold, PE
RE: Plastic Plain Bearings
Also I'm looking for something that can be injection molded.
Regards,
Rich.....
Richard Nornhold, PE
RE: Plastic Plain Bearings
Give the Vydyne Technical Support people a call.
http://www.vydyne.com/pages/product_info.asp
Are you intending to mold the component in house?
RE: Plastic Plain Bearings
Molded Delrin with that kind of wall will sink badly, so the molded piece would need to be relieved on the faces, into two annular rings and a diaphragm between them. Which, except for the material, describes a kind of bearing with integral spacer bushing that I thought was already produced by Thomson.
Delrin and nylon are both available in economical stock bearing forms, too. See nyliner.com for a start.
Mike Halloran
Pembroke Pines, FL, USA
RE: Plastic Plain Bearings
Just as a side note, it is great having a community of mentors & peers to be able to reach out for guidance and wisdsom. You both represent what it means to be master engineers, passing on your knowledge to us journeymen and apprentice engineers. Thanks for your time and advice.
Regards,
Rich.....
Richard Nornhold, PE
RE: Plastic Plain Bearings
Mike Halloran
Pembroke Pines, FL, USA
RE: Plastic Plain Bearings
Igus makes quite a few different bearing compounds. Available as finished bearings in many sizes. Don't know if it's available as bar stock or molding compound.
http://www.igus.com/
RE: Plastic Plain Bearings
spacers awhile back. We are using
HDPE now for them and they seem
to wear well in that type of application.
Both were injection molded.
RE: Plastic Plain Bearings
The Ticona website is a bit tedious to register but it's probably got all you need in it (the booklet, that is).
Rgds
Harry
RE: Plastic Plain Bearings
Charlie
www.facsco.com
RE: Plastic Plain Bearings
http://www.igus.com/
99 Dodge CTD dually.
RE: Plastic Plain Bearings
RE: Plastic Plain Bearings
http://www.qbcbearings.com/B605/qbctech32.htm
RE: Plastic Plain Bearings
best regard
Saheb
Babylon