I have a Monarch Model K 16 x 54 (5HP). Bought it over a year ago. Seller started it up, ran it through the gears, etc. So all good there.
Based on tags on the machine it looks like it was originally installed at Corpus Christi - U.S. Army Transportation Aeronautical Depot Maintenance Center "ARADMAC". An Army aircraft maintenance center. Overall the machine is in good condition!
Today I finally got it wired up. I used a 4 wire 10 gauge cord and plugged it into the 30 amp outlet I use for my Wells Index 745 vertical mill (albeit much smaller motor).
Power supply is a 10 HP American Rotary converter feeding a 3 phase panel. 30 amp breakers, minimum 10 gauge wiring all the way to the machine.
My RPC works great on the Wells Index 745. Am using the same outlet. X wire is the black, Y wire is the red, Z wire is the 'orange' manufactured 3rd leg.
When I power up the lathe the motor comes on, runs for 3 seconds, and then the motor stops. To get the motor to start again I have to reset the Furnas dual voltage coil on the left side of the Monarch's electrical box.
The power is entering the Furnas box form the left side of the box. The wires feeding up from the left most vertical conduit do not look like they have been connected to any power supply for a very long time.
Diagnosing electrical...not a gift of mine...so turning to the board for thoughts/advice.
Video link
The hum at the beginning of the video is the RPC. The hum is not the Monarch trying to start or anything like that.

I won't be leaving the wire entry into the switch like you see in the pic. Tonight was all about checking if the lathe would 'run'.


Based on tags on the machine it looks like it was originally installed at Corpus Christi - U.S. Army Transportation Aeronautical Depot Maintenance Center "ARADMAC". An Army aircraft maintenance center. Overall the machine is in good condition!
Today I finally got it wired up. I used a 4 wire 10 gauge cord and plugged it into the 30 amp outlet I use for my Wells Index 745 vertical mill (albeit much smaller motor).
Power supply is a 10 HP American Rotary converter feeding a 3 phase panel. 30 amp breakers, minimum 10 gauge wiring all the way to the machine.
My RPC works great on the Wells Index 745. Am using the same outlet. X wire is the black, Y wire is the red, Z wire is the 'orange' manufactured 3rd leg.
When I power up the lathe the motor comes on, runs for 3 seconds, and then the motor stops. To get the motor to start again I have to reset the Furnas dual voltage coil on the left side of the Monarch's electrical box.
The power is entering the Furnas box form the left side of the box. The wires feeding up from the left most vertical conduit do not look like they have been connected to any power supply for a very long time.
Diagnosing electrical...not a gift of mine...so turning to the board for thoughts/advice.
Video link
The hum at the beginning of the video is the RPC. The hum is not the Monarch trying to start or anything like that.

I won't be leaving the wire entry into the switch like you see in the pic. Tonight was all about checking if the lathe would 'run'.


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