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Audio cassette pinch roller - 11mm

Discussion in 'Electronic Repair' started by Remove _ for valid address, Jan 22, 2007.

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  1. I'm trying to recondition an Akai GXC760D Hifi cassette deck
    (late 70's vintage I believe.)

    This is a twin capstan (both engaged at once) design that uses
    11.0mm diameter pinch rollers. The diameter is quite critical
    as there is only just enough travel on the carriage, the
    clearances are tight, and I think the nature of a twin
    capstan design makes pinch roller pressure fairly critical.
    The common replacement sizes (9.6mm and 13.0mm) do not fit.
    I think an acceptable range would probably be 10.5-11.5mm.

    The height is 7.9mm and hole diameter 2.5mm, though these
    are somewhat negotiable.

    I've looked through a variety of usual UK parts sources
    (RS CPC/Farnell Grandata CharlesHyde Seme etc)
    and I get the feeling nobody stocks other than the two
    'standard' sizes.

    Anyone know of somewhere that stocks 11.0mm? Anywhere
    in the world (though UK would be ideal.)

    Alternatively, has anyone successfully machined down a larger
    size (e.g. 13mm) on a lathe? My gut feeling is that rubber
    is unlikely to machine down smoothly, though I've not tried.
    Or maybe, if a VCR pinch roller of the right diameter existed
    (is there a table of VCR model to diameter anywhere??) then
    as these seem readily available, could one be cut down in
    length?

    Thanks for your help!
    Mike.
     
  2. N Cook

    N Cook Guest

    Go to a small industrial rubber products supplier and ask about rubber
    cordage, no not S&M.
    Local to me
    http://www.southamptonuk.co.uk/index.cfm?id=552&cat=346
    all 3 Technix, Martins and Portmere are perfectly happy for small sales
    enquiries.
    Preferably go in when its quiet and stock up with a range of "O" rings and
    they may give you a sample length of cordage, otherwise about 2GBP per
    metre.
    Preferably with a lathe , for centering , drill hole through pieces of the
    right length, cut with a sharp knife. One should be good enough
     
  3. Meat Plow

    Meat Plow Guest

    Many years ago if I recall I resized a pinch roller for something using an
    emory board and a Dremel tool. I guess if you're in a "pinch" (pun
    intended) the closest port in a storm will often do.
     
  4. You could try a razor blade as a cutting tool and very fine cuts.




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  5. Jim Land

    Jim Land Guest

    (Remove _ for valid address) wrote in
    The way to reduce the diameter of a rubber cylinder is to chuck in in a
    lathe or electric drill, start it turning and bring a block with sandpaper
    up to it. You abrade the rubber away, the same way you file your
    fingernails.
     
  6. Arfa Daily

    Arfa Daily Guest

    I've sometimes found that with oddball sizes, they are more a function of
    the hub diameter, so if you can get a replacement 9.6mm roller of the
    correct width, removing its tyre, and refitting this to the original hub,
    will get you a 'new' pinch roller of the correct diameter. The rubber is
    quite flexible, and will normally stretch over a slightly larger hub without
    too much trouble, helped if necessary, by a little washing up liquid. I've
    also performed the same trick where the hub is the same size, by cutting a
    short length of heatshrink tubing to fit over the centre part of the hub.
    When that is then shrunk on, it will boost the diameter of the hub by up to
    a mm, which will do the same to the outer diameter of the tyre when it is
    fitted over it. When refitting the tyre, make sure that it has gone into the
    hub recess squarely all round. This technique only works of course, for
    pinch rollers with a central plastic hub, not those with a moulded-in brass
    bush. Bit of a bodge I suppose, but it does work, and is a lot less trouble
    than filing and lathing and so on.

    Arfa
     
  7. Guest

    Its poss to fit a rubber sleeve on a smaller wheel, if that would
    otherwise fit.


    NT
     
  8. quietguy

    quietguy Guest

    Just wondering how putting some shrink wrap on the smaller replacement
    would go to build up the diam - slip?

    David
     
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