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Rubber idler wheel rubber restoration

Discussion in 'Electronic Repair' started by Jeff Liebermann, Jan 12, 2008.

  1. Ken Layton

    Ken Layton Guest

    I went to: http://www.russellind.com/index1.htm

    Then "download" and then PRB Line catalog.
     

  2. That link was dead when I tried it, yesterday. I got a 404 error.
    It's working tonight.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  3. Mr. Land

    Mr. Land Guest

    Finally. Someone named a product after me.
     
  4. I have used Rubber Roller Restorer from www.fixyourownprinter.com

    http://www.fixyourownprinter.com/specials/misc/all/S03

    Fixes printer rubber rollers etc etc.
    Colin
     
  5. Ken G.

    Ken G. Guest

    All the rejuvenating stuff will not work or will not last long .

    If you have some VCR belts around that will fit around the hard idler .
    A real thin one the same width would be deal but 1 or 2 of the square
    ones will work .

    Stretch or place the belt-s around the idler and run a bead of superglue
    around to hold it on . mount the idler in a drill and run it on
    sandpaper .
    If you are using square belt-s you shound sand it down in the drill
    first to take some off so the finished diameter is closer .

    This works for me 100%
     
  6. Guest

    About 25 years ago, I had a Nordmende pinch roller that didn't respond
    to the usual surface treatments, so a coworker tried TCE or MEK. The
    trick was that he used either heat and/or pressure/vacuum (don't
    remember anymore what the chamber was) to induce the TCE to
    penetrate. After the TCE the pinch roller was clean and pliable, but
    shrunken. So I followed another recommendation to soak it in brake
    fluid, and sure enough, it plumped right up. YMMV, no warranty
    expressed or implied, etc.

    TM
     
  7. msg

    msg Guest

    Nice hearing the various techniques mentioned in this thread. I have
    restored digital tape transport capstans by removing the deteriorated
    rubber and layering back to the original diameter using multiple dips
    in liquid vinyl; the capstan needs to be spun at low rpm with the shaft
    horizontal until each vinyl layer has set. I did a capstan for an
    HP-85 awhile ago that required quite close tolerances and this technique
    worked well; the result was a bright red surface however ;-)

    Regards,

    Michael
     
  8. The HP85 drive roller is mostly metal with a relatively thin coating
    of rubber. See photos at:
    <http://www.voidware.com/calcs/hp85rep.htm>
    See page 2 of 3 pages. Resurfacing such a roller will work just fine.
    However, the Sony and Gerrard idlers have a much thicker layer of
    rubber. The deformation depth of the capstan is also substantially
    deeper than the HP85 drive roller, requiring a much thicker deposition
    of added rubber. It's probably possible, using the suggested freezing
    the rubber and machining it down to the diameter required. As I
    indicated in a previous message, I think it will work with the
    relatively wide Sony idler, but will not work with the fairly narrow
    Gerrard idler.

    Current status is that I'm gathering an assortment of chemicals and
    concoctions, along with a variety of rubber parts. I'll try some
    experiments next weekend, and then apply the least disgusting fix to
    the customers antique tape recorder and turntable.

    Thanks for all the suggestions and hints.

    Incidentally, this is how I repaired an HP65 calculator drive roller:
    <http://802.11junk.com/jeffl/pics/hp65/slides/Hp65-Drive-Roller.html>
    The "rubber" is a piece of vinyl tubing, conveniently with the correct
    diameter. The only good way to cut it to size is with a razor blade.
     
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