Hi Zero- you may never know exactly what caused the failure, in fact, the whining sound could be an issue with the motor itself, which then failed the controller. In any case, it's dead now so you have a few options:
1) send the board off to Pete
2) try to repair the board yourself
3) replace the controller with another identical one, or an SCR type, or a treadmill one
The motor should be tested to verify proper current draw and no abnormal leakage to the case or interwinding breakdown; if there is any doubt you should either replace it or if you decide to send the board off, send the motor too so they can be tested together.
These controllers have a history of failing under hard use unfortunately, probably because they are made so cheaply
Mark
ps you could cobble together a quick and dirty substitute control using an ordinary light dimmer driving a bridge rectifier. It won't give great load regulation but would at least get you back on the air
[/QUO
I think your right on all counts--I will probably use the treadmill idea since I already have the motor and an MC-60 controller from the treadmill--I just hate that this will all have to be outside the footprint of the lathe--but no matter i have to get it done and get back to work on the projects--Im building a small front loader and Backhoe for my son to use in his work--he is like I was an electrician, and has the same problem--he has topped out--he is 27.50 an hour now and has been for 3 years--he knows he wont make any more money unless he starts his own business, which he wants to do--so he will need these major tools for that kind of business--I went looking for some small to medium tractor with a loader on it--and found after 4 to 5 months of looking that a good price for one that`s 15 to 20 years old is 10 to 18K--I was stunned --I started researching how to build and found a good set of engineered prints to build this online for 165 bucks---total build cost should be about 3k---but not with out the tools working--and my band saw just broke as well--that problem is a broken worm gear--I will need the lathe to make a new one--you know how it goes--so yep--your right --I have to change this over--any help--drawings---wiring--of any kind you can send will be great--Thanks for everything--Greg---if you ever have any questions on Plumbing--or--electrical--ask me--not electronics---electrical