GFI is getting wore out?
Problem with the windings and or arcing in switch/motor?
The GFI is getting input either from the machine or the GF! i s wore out?
Are the plugs and receptacles in good condition?
john

"Bill Leonhardt" wrote in message
...

In my shop I have two general purpose electrical circuits that I connect
everything to except the big machines. They are 20 amp (120VAC)circuits
with 12 gauge wire. Each circuit starts with a GFCI outlet and then a chain
of normal outlets. All outlets are 20 amp.

On one circuit I have my Yorkcraft 6" jointer plugged in. I've had this a
few years. It's been lightly used with no prior problems.

This evening I was jointing a piece of 1 x 6 maple set to take off less that
1/64 per pass. After a bit, the GFI would pop. Thinking this might be the
GFCI outlet, I connected the jointer to the second circuit. Same problem.
The only other piece of equipment running was the DC which is on a separate
240VAC circuit.

The circuit breaker (20 amp)never pops. The GFCI outlet is maybe 6' from the
panel and the second outlet (jointer) is about 8-10' from that.

The jointer has a 1 hp motor (running at 120VAC)and, when I pulled the cover
off, the motor was barely warm. No dust buildup either since I have this
connected to my DC.

I have done a baby crib's worth of (soft)maple and 2 large bookcase's worth
of cherry without incident. The piece I was working on was a piece of the
leftover maple.

Any thought why this would cause the GFCI to pop and not the circuit
breaker? Also, what would I look for with respect to the cause. I bought
the jointer new 8 or 9 years ago and it has been lightly used.

Thanks,

Bill Leonhardt