Cone CA bushings in UHMW or Delrin?

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randyrls

randyrls

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I want to make some cone bushings to apply CA finish to pens. I really want something that CA will not stick to.

I tried to use some UHMW (Ultra High Molecular Weight) plastic but it doesn't turn worth a s--t.

I have some delrin rod, and I may try that next.
 
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Hi Frank,

you may certainly disagree with your choice of the two material(s) but according to The Plastic Sourcebook provided by www.plasticstore.com there is no doubt that delrin offers a higher tensile strength and a higher coeffient of friction value vs. UHMW. See attachment.


Download Attachment: _0512085143_001.pdf
46.4 KB
 
Originally posted by randyrls


I want to make some cone bushings to apply CA finish to pens. I really want something that CA will not stick to.

I tried to use some UHMW (Ultra High Molecular Weight) plastic but it doesn't turn worth a s--t.

I have some delrin rod, and I may try that next.
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Since you didn't like how the UHMW worked and you have some delrin rod, you should definitely make them out of delrin.
 
Originally posted by Rifleman1776

Guess I have to disagree with Peter, they both are very similar IMHO. I suggest trying HDMW (high density molecular weight). It is very hard and extremly durable.
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HDMW (high density molecular weight)& UHMW (Ultra High Molecular Weight) are both generic terms for literally hundreds of different types of plastics, some are hard and others are not so hard. Delrin would be a good choice of material as it cuts well with lathe tools, Is relatively inexpensive, and is readily available. One thing to consider about Delrin is that you can get a pretreated delrin that is called "sanitized" and it WILL allow CA to stick to it. Also be aware that there is also a product called Nylatron that looks very much like delrin and it will also allow CA to stick to it. I believe that MSC sells delrin at a good price.
 
Most of you know that I sell delrin bushings and rods. I stopped selling UHMW rods after an "accidental" test. I had left a 3/4" delrin and a 3/4" UHMW rod leaning against my tablesaw one afternoon. The next morning the UHMW rod was severely bowed while the delrin rod was still straight. I then noticed the UHMW strips (1/2" and 5/8" thick) that were being stored in an upright position were also bowed and the delrin was not. Very unscientific I know, but it gave me something to think about.

My personal opinion is that delrin, in the realm of pen making, is a much better product for bushings and other non-stick applications. Also, delrin, a Dupont trademaked product is available as a slightly less expensive generic called Acetal (copolymer).
 
Originally posted by jcollazo



My personal opinion is that delrin, in the realm of pen making, is a much better product for bushings and other non-stick applications. Also, delrin, a Dupont trademaked product is available as a slightly less expensive generic called Acetal (copolymer).
Click to expand...

Thanks to everyone who contributed. I think I will try Delrin. In the mean time, I made a few cone bushings out of oak pieces I had lying around.
 
I bought some of the UHMW and the Delrin from Joe, and after trying both of them, I have given up on the UHMW and am sticking with the Delrin. It is easier for ME to turn and seems to hold up much better, IMHO.
 
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