M-Head wiring

[scottmi]

Hello All,
just joined this forum and it is great. I recently aquired a 1947 1/2hp round ram and was wondering if anyone had a wiring diagram to hook it up for both 110 and 220v. I got a manual for it and the book did not have anything about wiring the head up. I would like the option to go 110v possibly thinking of putting it on caster so I can move it around the shop and use it as a heavy duty mill/drill.
Thanks

[machintek]

To the best of my knowledge, these had a three phase motor for 220/460 and an optional single phase 110 VAC motor. There should be a plate on the motor identifying what it is. I do not knowof any motor that was single phase 110/220 unless it was aftermarket.

George

[scottmi]

The moter data plate says 115/230v, 1ph, it is the original motor. The problem is usually a motor will have a little wiring diagram underneath the plate for the wires to come in the motor to tell you which way to wire for the differnt voltages, mine is missing. So that is the info I need.

[Eric]

How many wires are comming out of the motor? What is the resistance across each of the wires?

[scottmi]

It has 3 prongs on the plug the prongs are angled like 220 plugs then it feeds into a fuse box and out to flex conduit with two black wires, the previous owner was using the conduit for ground I am assuming.

[scottmi]

Here are some pics of my mill and the machining school I run.

[Eric]

NOTE: DO NOT USE CONDUIT AS A GROUND. Run a dedicated green/yellow wire for the ground.

The 3 prong plug is just connected to the forward/reverse box terminals. Open up the forward/reverse box and see how many wires are comming out of the motor. What are the labels on each of the wires? Usually they are 8 wires for a dual voltage motor labeled: T1, T2, T3, T4, T5, T6, T7 & T8.


Here are some general wiring configurations for 1 phase AC motors:

For low voltage CW rotation:
Connect L1 from mains to motor T1, T3 & T5
Connect L2 from mains to motor T2, T4 & T8

For low voltage CCW rotation:
Connect L1 from mains to motor T1, T3 & T8
Connect L2 from mains to motor T2, T4 & T5

For high voltage CW rotation:
Connect L1 from mains to motor T1
Connect L2 from mains to motor T4 & T8
Connect motor wires T2 & T3 & T5 together

For high voltage CCW rotation:
Connect L1 from mains to motor T1
Connect L2 from mains to motor T4 & T5
Connect motor wires T2 & T3 & T8 together

Basically you swap motor wires T5 and T8 to change motor directions.

Hope this helps.

[scottmi]

Thanks Eric, I will take a look at it tomorrow.

[scottmi]

Got it thanks, it is wired for 110v and runs great.