Is Delrin/acetal the best choice for this?
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  1. #1
    Join Date
    Mar 2006
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    Is Delrin/acetal the best choice for this?

    I'm looking to build a roll bender for 7/8" to 1" aluminum and stainless tube. Similar to the one included.
    I will probably make the dies out of plywood initially to test it out. To replace them, I was looking at using a piece of 3" round bar acetal. Will this work or will it be too slippery? Anything else that would work better? I'm thinking that with the pressure from the top roller, it will bite in enough to prevent slipping.

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    Campbell Hausfeld Fluxcore 80
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  2. #2
    Join Date
    Mar 2007
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    Lookout, West Virginia
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    Re: Is Delrin/acetal the best choice for this?

    It will probably slip more on the SS than the AL, but as long as you aren't bending it too much with each pass, it might work. You can always just shove the tube through while the other hand turns the crank.

  3. #3
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    Re: Is Delrin/acetal the best choice for this?

    Aluminum dies for the geared rollers would have more grip.
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  4. #4
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    Jan 2011
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    Re: Is Delrin/acetal the best choice for this?

    Gears would also work better than sprockets
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  5. #5
    Join Date
    Mar 2006
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    Re: Is Delrin/acetal the best choice for this?

    Quote Originally Posted by Oldendum View Post
    Aluminum dies for the geared rollers would have more grip.
    Both the aluminum (anodized) and stainless will be polished and have to avoid scratching it.
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  6. #6
    Join Date
    Mar 2006
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    60

    Re: Is Delrin/acetal the best choice for this?

    Quote Originally Posted by propanehotrod View Post
    Gears would also work better than sprockets
    I think so too. I'm looking to try to find some. I think the reason for the sprockets is because the dies are slippery to give it double to bite.
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  7. #7
    Join Date
    Nov 2005
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    Nashville, TN
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    Re: Is Delrin/acetal the best choice for this?

    If not cost prohibitive, then you might consider dissecting a HF planetary ring roller. I suspect slipping will be more prevalent the tighter your radius. My small hf roller has no knurling left and only slips if I roll real tight.

  8. #8
    Join Date
    May 2010
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    Re: Is Delrin/acetal the best choice for this?

    Delrin is fairly slippery stuff.
    Maybe not so good where traction is necessary.
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  9. #9
    Join Date
    Jan 2011
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    W. Wisc
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    Re: Is Delrin/acetal the best choice for this?

    What about a urethane or rubber coating on a steel wheel? You would get good grip and no-marring surface that way. Depends how serious you are about this. There are places that can coat rollers like this, but it will cost. I suspect Delrin or any plastic is going to be too slick.
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  10. #10
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    Re: Is Delrin/acetal the best choice for this?

    Would a small diameter wide rubber band in each roller help?
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  11. #11
    Join Date
    Mar 2006
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    60

    Re: Is Delrin/acetal the best choice for this?

    Quote Originally Posted by whtbaron View Post
    Would a small diameter wide rubber band in each roller help?
    Not a bad idea. I was thinking about gluing a piece of rubber on a plywood die initially to test it out.
    Campbell Hausfeld Fluxcore 80
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  12. #12
    Join Date
    Mar 2006
    Posts
    60

    Re: Is Delrin/acetal the best choice for this?

    Quote Originally Posted by davec View Post
    What about a urethane or rubber coating on a steel wheel? You would get good grip and no-marring surface that way. Depends how serious you are about this. There are places that can coat rollers like this, but it will cost. I suspect Delrin or any plastic is going to be too slick.
    Definitely something I will look into when I get the design figured out. Thanks
    Campbell Hausfeld Fluxcore 80
    Thermal Arc 185
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  13. #13

    Re: Is Delrin/acetal the best choice for this?

    Cut a piece of truck inner tube and glue it to the rollers with something like 3M super weatherstrip adhesive. The tube will be thick enough to protect the surface and provide grip at the same time.

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  14. #14
    Join Date
    Nov 2005
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    Nashville, TN
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    Re: Is Delrin/acetal the best choice for this?

    How does the roller in the photo perform?

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