I have a problem with a 8" Grizzly jointer that I got secondhand. The
cutterhead pulley is held on the shaft with two set screws and a key.
After running the jointer over very light loads for an hour or two the
key invariably works its way loose and flies out of the pulley.
There's a guard mechanism around it so it just rattles like hell until
I can power down the jointer. But this has happened several times.
The first time it happened I replaced the pulley and set screws
thinking it was a defect in the pulley itself. This did not fix the
problem. I've tried really cranking down on the set screws and
leaving them a little loose. No dice, it always happens again. I've
also replaced the drive belts.
The alignment between the cutter head pulley and the drive pulley
looks fine. Likewise the cutterhead shaft itself seems balanced and,
when I've just "fixed" the problem the machine runs quietly with no
evidence of vibration. I'm out of ideas about what to do at this
point... I almost want to weld the damn key onto the pulley. :(
If anyone has advice I would be very appreciative.