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Repair vcr crack gear???

Discussion in 'Electronic Repair' started by [email protected], Feb 14, 2007.

  1. Guest

    I have a multi system sharp vcr, and recently it refused to eject the
    tape.
    I found out the gear at the motor drive shaft that is responisble for
    loading and ejecting the tape is crack.
    However, i am unable to find replacement gear.

    The gear is a bit small, and using the krazy glue still can't make a
    tight gear.

    Is there anyway to repair the gear? any suggestion?

    Thanks!
     
  2. N Cook

    N Cook Guest

    There is a couple of tips relating to repairing broken plastic gears
    somewhere on my 2 tips files on URL below
     
  3. Guest

    Don't use crazy glue or you'll have to remove it to make a quality
    repair. Glue simiply doesn't work well enough on nylon, which is best
    repaired by melting it back together with a soldering iron and some
    scrap nylon of the same type (another nylon gear, not a nylon wire
    tie). As with metal welding, melt the material almost all the way
    through. If the center hub of the gear is cracked, melt it back
    together and place a metal sleeve (thinwall tubing - brass, steel, or
    aluminum from a hobby or hardware store) over it, using epoxy to hold
    it if the fit isn't snug.
     
  4. Ray L. Volts

    Ray L. Volts Guest

    I'll assume this gear is nylon. In 25+ years experience, I have yet to
    discover an effective and lasting method for bonding nylon to itself.

    Solvents/adhesives supposedly made for the task don't perform well,
    either, nor does heat welding. It's very difficult to keep a
    cracked/slipping gear together when it's under that kind of
    torsion/shearing stress.

    That said, there are always alternatives. If this unit is worth the
    trouble and expense to ya, you could make a mold of the original and
    have a machine shop cut a new one from metal stock, or cast one yourself.
    Better still, find for sale a used -- possibly malfunctioning for a
    different reason -- vcr of the same model series as yours with a good
    gear and cannibalize it.
     
  5. There is no way. Nylon is molded 100% bone dry and absorbs moisture after
    that. Once absorbed, no weld is possible. Unless you can mechanically repair
    it you are screwed.



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  6. C

    C Guest

    I've had to make many gears and misc. parts.
    Go to your nearest hobby shop and buy some Alumalite plastic. It's a
    two part liquid plastic that you mix together and it is completely set
    and hard in 3 minutes. They also make a rubber casting compound to copy
    the original gear with. I've been using it for years to make gears and
    other parts for older copiers and such.
     
  7. Guest

    I used to weld nylon gears in hotel TVs all the time when I didn't
    have spares, and not one cracked again. I even still have a 30 YO
    Sanyo Sears with a small gear that had lost some teeth. The new teeth
    I welded on have held up for at least 10 years now, and I was rough on
    that tuner, wearing holes all the way through some of its contact
    fingers.
     
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