Coefficient of friction between ABS and Delrin

[kjoiner]

Hello,

Can someone tell me the coefficient of friction between abs and delrin? I want something low. I am planning to align an abs part that has a pin into a guide slot made from another plastic. If delrin is not suitalbe, is there another common, low cost injection moldable plastic that would be suitable?

Thanks,

Kyle

 

[plasgears]

Check DuPont.

 

[nigelt]

I recommend you go to LNP Plastics (now part of GE Plastics) and check out their design guide for Lubricomp. Therein are tables for Plastic-on-Plastic comparisons. We have done a product with an injection moulded Acetal washer style ring of about 40mm int diam with about 2.5mm annulus, running dry on a stationary ABS housing. The application being analogous to a mouse scroll wheel, but operating horizontally, with the load applied to the 'flat' of the washer, rather than the edge - so it was an offset axial load tending to tip the washer. It worked pretty well, though the the requirement was pretty light in truth. The whole set up was noisier than we had hoped for (scuffing/rubbing sound) due in part to the shape of the ABS housing.

"The ideal client is one possessed of great good sense and perfect judgement;
that is to say, one who agrees entirely with the designer at all times and in every respect."
Fenwick Williams, Naval Architect.

 

[rnd2]

kjoiner
PE in its various forms has been called the poor man's teflon. May lack rigidity.
Nylon is pretty good. Pat Primmer is the man to advise for this material.

 

[kjoiner]

We use UHMW in several applications but the concern in this appilication is that is creeps under load and the screws used to fasten the part would loosen over time. Delrin seems to work well in other applications. Also, we could be injection molding these parts in high volumes and UHMW is not injection moldable. I'm having some prototype parts machined and when they come in, I will be able to test them in a simulation.

Kyle

 

[patprimmer]

I would search my DSM and LNP archives.

As LNP has already been mentioned, I did not comment further.

A lot depends on the actual conditions of use. Nylons, polyesters, acetals, various fluorocarbons, PE and PP all make good bearings and all have strengths and weaknesses.

RTP Company also has an excellent web site for data.

http://www.rtpcompany.com/

Regards

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