difference between teflon & delrin?

[The Cobbler]

as the title suggests.
I want to make some rollers(wheels) for a floor scraper that were originally speced (and available as a replacement part) made from teflon .
I have a pc of delrin .
what is the basic difference ?

 

[Cahark]

As far as machining goes. Delrin is much easier to work with and hold size accurately. I will add that they both machine relatively well. Teflon seems to move a bit more dimensionally during machining.
I cannot tell you much about the scientific properties between the two. But I can tell you that Delrin seems to be a little harder, and Teflon seems to feel a little more slick.
I have replaced Teflon pieces in the past with Delrin, but none of them have been critical components.
I'm not exactly sure what kind of floor scraper you are talking about to give you my opinion if Delrin would be suitable or not.


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[lakeroadster]

Delrin is about 2 times stronger than PTFE... give or take ... depending on the specific grades used

http://www.plasticsintl.com/sortable_materials.php

 

[The Cobbler]

they are just approx 3/4"diameter by 1" wide rollers with a 1/4" bolt thru them so you can move the machine on a floor and not scrape it up. no weight to speak of. they got full of old glue and seized from turning so they have flat spots on them . I could buy new from the manufacturer, but it's a nice simple lathe project for me. and since I have a pc of 1" delrin, I'm good to go.

thanks.

 

[t100]

Our machine shop uses both.

Delrin is super easy to machine, stronger but more brittle.

Telflon is slick, chemically stable and resistant to heat, much more expensive too.

In your case, Delrin should work but not being ideal.

 

[iajonesy]

Delrin contains a Nylon-like material to give it the hardness you need and teflon does not. We used the two products somewhat interchangeably for bearings and rollers and slides. You should be fine using Delrin for your application.

Mike

 

[ez-duzit]

Delrin should be an improvement.

 

[The Cobbler]

Thanks for everyone's input
here's my rollers completed

started with 1" delron, turned the OD to about 0.800, bored a thru hole for the axle bolt, cut and faced them to 0.650 long , chamfered the inside & outside corners .
you can see in the picture the original all gummed up with vct glue. and have worn flats because the rollers were binding from the glue

 

[The Cobbler]

installed on machine