Larry Jaques wrote in
:

On Thu, 22 Oct 2009 10:59:49 GMT, the infamous Doug White
scrawled the following:

My shooting club has motorized target carriers on the indoor range.
They use "Maxtorq" gear motors, and one isn't working. The motor
shaft spins, but the output shaft doesn't. It doesn't make any excess
noise like grinding of gears or anything. These have been in place
since at least 1970, and they have been so realible that I don't know
if anyone is around who knows much about them.
snip
I'll bet it's a shear pin that let loose. And in a public setting, it
has probably been in service like that for long enough that the broken
nubs are worn down and it doesn't make noise any more.

I think this was a fairly abrupt failure. It was fine one week, and when
I came in to practice several days later, it had a sign on it. We
frequently have the range to ourselves on Saturday nights, and the motor
was dead quiet, spining merrily.

There's likely an inspection or access plate on the geared end so
you'll probably be able to work on it live. Just make sure to tape the
switch down so nobody accidentally causes you to be one of the targets
moving along the line, Doug.

I'll have to get up there with a ladder & take a closer look. H adn't
thought about a shear pin. I don't even know if it's ac or dc. They are
operated with a manual 3-position spring return (on-off-on) toggle switch
to change direction, and the cords are tensioned such that the pulley
slips when you get to each end of travel. I'm assuming it's a reversable
ac motor. It looks a bit like one of these:

http://electricmotorwarehouse.com/Dayton/6Z073.htm

let's see, an array of screwdrivers, a 1/4" drive set, a transfer
punch set, a small hammah, and some needle nose pliers oughta do ya.
Don't forget the tub of moly wheel bearing grease to re-lube it after
you're done. Oh, add a roll of paper towels and tube of hand soap.

Got shear pin-, cotter pin-, or roll pin-sets?

I've got cotter pins & roll pins, but no shear pins. Once I get more
info off the nameplate, I'll have to see if I can find a manual
someplace. There are several different brands on the line from the looks
of them. I also need to come up with some sort of clamp or hook to hold
the pulley & cord while I work on it.

Thanks for the ideas.

Doug White