... It's the big Ohmite rheostats that you need to have enough parts to attempt to put the original drive back in service.
... Meanwhile.. "dollars and cents-wise, it is WELL WORTH trying to find an OEM exciter!
Better yet, a complete MG with one still on it.
It looks to me as if the original DC Control Panel and motor/generator (sans exciter) are still part of the system. This makes no sense if the spindle motor is an AC motor. Can you post a photo of the data plate on the spindle motor:I spoke at length today with the previous owner about the history of the machine. He is 91 years old and purchased the machine in the early 1960s. The machine left the factory with the standard M/G setup and standard tailstock. It was then retrofitted with the turret tailstock and control cabinet, which eliminated the need for the exciter, which is 60 years gone. The wire box above the generator is part of the retrofit and leads out and up to a multi pin connector which the big control cabinet plugs into. Perhaps the tubes and circuits in that cabinet did the work of the exciter. In any case, I do intend to use the original DC motor and replace what is missing as time and funds allow. The speed pot and chain and sprocket linkage are also missing. ...
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Is this a "rotary phase converter" (RPC) or something else? A 5HP RPC is marginal for a 10EE, but some people are successfully using them. An RPC with a 7.5 HP idler motor is sufficient. It will run from a 30A, single phase 240 circuit.I have a 5 HP 3 PH converter at 220V
OK, that makes sense. The four GL-393-A tubes are thyratrons; the EL-1C is a full wave rectifier. That sounds about right for a circuit that can control the field windings of both the spindle motor and the generator. (Controlling the generator's field indirectly controls the spindle motor's armature.) I don't think that you'll find the Ohmite rheostats in the cabinet. Was there any electrical documentation in the cabinet? (This was obviously a professionally designed and built system.)