HOWTO - FIX faulty Drive Belt with O-Ring.
Projector etc, drive belt wears loose or snaps.
The case written about here is my Sankyo 800 Super-8mm
FIX IN BRIEF
Replace with O-Ring available from auto Brake repair parts
suppliers, eg "Brake Service Centre".
The O-Ring needs to be THINNER than the original drive belt
and of similar or slightly larger diameter to give a loose fit.
FIX IN DETAIL
suggested O-Ring replacements. I asked at a hardware shop and got directions
automotive supplier "Brake Service
Centre". This was the perfect setup with O-Rings of
various diameters andthicknesses
displayed on a self-service display
rack. They cost about $3.00 each and I
had the good sense at the time
to buy 4 slightly different ones of about
the same size as the snapped drive belt which I had brought with me.
On getting home, the best-of-4 result was
not the one I expected.
3 of my belts gave
too much friction and slowed the motor down.
The best-result O-ring was thinner than the
original and also quite loose fitting so when running it appears to billow out
on one side. But that is the one
that delivers smooth running at full speed.
The Sankyo 800 had
me very puzzled at first as to how to get the O-Ring on because there seemed to
be no way
get it past a worm gear arrangement operating the frame
counter. But closer
inspection revealed ingenious design to allow for that. On
loosening mounting screws for the worm gears,their
white nylon holder slides along and down
slightly opening a gap for slipping in the O-Ring.