My Clausing 12x37 clone will not run backwards
Today, my Clausing 12x37 clone metal lathe has stopped turning off with the lever switch on the apron. I can switch from forward to neutral to reverse and hear relays at the front lever switch work each time but it keeps running forward. If I want to stop it I have to hit the emergency button. This is at least aggravating. But, I can get stuff done as long as I don't need it to run backwards.
My problem right now is I'm all set up to run backwards for a threading operation that I don't feel comfortable running forward. The lathe will only go forward and starts right up with the apron lever in the neutral position when the start button is pressed. It still will not start in the forward and reverse apron lever position, as it's not supposed to. But if it's in the apron neutral position it will start running forward when the start button is pushed. Cutting power to the lathe does not effect this behavior when reconnected.
There are several multi wire relays in the panel box on the back and I suspect one of them is the problem, or the switch in the front controlled by the apron lever. The motor is 220 single phase.
It has happened before and not really been a problem. The next time I used it it would act normally for a while. And, maybe I can let the thing cool down and get these threads cut later tonight or tomorrow. But, I need to eventually fix the problem.
I do not know how to diagnose how to fix this. Any suggestions on what I should do?