Bridgeport x-axis power feed

Tom Gardner fired this volley in news:eMSdnQe88cZGdQLMnZ2dnUVZ snipped-for-privacy@giganews.com:

It might have a shorted direction switch, causing a dead-short on the incoming power. It might have a shorted winding. In that case, you're screwed.

I've got a $300 Chinese cheapy as the knee drive on my R2E4, and it's been in service for - what? - over ten years(?) on two different machines.

Lloyd

At least there is a repair service center in town. I got this 25 years ago an it's been on two mills too! We've been using it full speed to do some minor production wood planing lately...that's a sin!

As one ages, one wishes for a knee drive! And, a power draw bar!

Tom, I'm looking at a schematic for an Align brand power feed, that I'm guessing is an exact copy of the Servo brand (which I too have on my Wells-Index mill but no schematic included in the documentation). At any rate if any electronic component failed short, the drive would be running full speed. And only the shorting failure of the stator or rotor windings could cause this sort of problem. My guess is that some other wire has come loose, and is shorting to ground. Check the table feed limit switch harness, as the power goes through these right after the circuit breaker and power on indicator light. ignator

Are you talking about another electronic device that was damaged by a utility line power surge? Maybe didn't think that was relevent?

Nevermind the maybe-a-wire-came-loose diagnoses.

Thanks. The rubber "bubble" on the switch is worn through and the limit DOES take the brunt of abuse.

No, just happened last week. Putting it on the bench will probably tell.