Find yourself a 3 to 5 HP three phase motor and make yourself a Rotary Phase Converter. A rotor will let your use the two speeds you have in your motor now. You can INSTANTLY reverse your mill motor if you need to. You can not do this with a Static Converter and I am not sure but I do not think you can do this with a VFD. When using a VFD, You have to do the reversing with the VFD. Also, ALL three phase motors are reversible. All you have to do is switch the connections of any two of the three power input wire for the motor to reverse. The Rotary Phase Converter I have I built from a 3 HP three phase 1200 RPM motor. When I first built the converter, in the summer I could roll the shaft with my foot and apply power to start it. In the winter I had to use a starting rope. Later I added a auto-start time delay circuit with start capacitor and still later I added run capacitors to reduce the idle current. I did this over a few years as I could scrounge the need parts on the CHEAP. Cheak practicalmachinist.com The have a sub-forum just on building Rotor Phase Converter/VFD"s.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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