Pictures will be coming, if needed. I spent the evening re-wiring the borrowed trailer. It seems I always end up re-wiring any trailer I use. As much as people like to attribute it to old Joey Lucas, Dim-Flicker-Off was invented by 3-M with their damn scotch-lock connectors and developed to a fine art by the trailer wiring industry. A new harness from HF, a dozen FAA approved but splice connectors, and a foot of heat-shrink later.
This has been an interesting adventure. I learned more today about the 1890 politics of Philly, the city topology, and the battles of Edison, Telsa, and Westinghouse, than I really planned on. I *AM* going to have to dig out that old biography of Tesla I picked up off the bargain table a few decades ago but never got around to reading.
While Peco offers both five wire and three wire 2 phase, the little bit I found suggests they are mutually exclusive. Since the machine was built to handle four incoming lines, and the motor diagram shows L1-L4, I have to assume it was designed for five wire 2 phase (fifth wire being common neutral).
The 2 phase diagram on the motor, as others around the web, show 8 connections and four leads coming in. This one has 9 and 3. A few of the wires have the original T-* markings. A few are blank, or too faint for my eyes, anyway. And a few have clear markings of type and manufacturer, obviously not matching the OE wires. Conclusion, the motor itself and been reworked.
The drum switch has a few wires with non-OE crimp eyelets.
Ringing out the switch, The connections of two leads to L1 and two leads to L3, which the switch reverses. Bundled wires (with non-OE tape) are two to L2, and the final three ganged together. This does not come close to matching the two phase diagrams, but matches the diagrams I find for low voltage Wye 3ph perfectly.
Conclusion. The machine has been rewired 3 phase, without correcting the labeling.
If you want pictures, Mark, I'll dig them off the camera. But at this point I'm 95% positive it's wired 3phase.
Now my next quandry. Is it permissible to run a VFD off of the quasi-three phase of a RPC? That would save me considerable wiring If I could repurpose the lathe's VFD 220V circuit to the RPC and feed the VFD and mill from the RPC.