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Home Workshop > General Area > General > Three phase supply to bridgeport

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Three phase supply to bridgeport

Bottom#21 Top Feb-01-12 08:06:25

Re: Three phase supply to bridgeport

Hi Richard,
Doing a bit of research it seems the earlier machines with the belt change head had dual speed motors. The later machines had a variable speed head controlled by belt and variable pulleys on the same principle as my Raglan lathe.
I just want to use the machine transformer as it will be a more tidy solution with the added benefit of a low voltage supply for machne lighting etc (as origional wiring).
As for motor pick up the main switch case seems to be the best bet.
I'll let you know how it pans out.

Richard

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Bottom#22 Top Feb-01-12 11:38:30

Re: Three phase supply to bridgeport

Hi Richard,
I didn't realise it was the Varispeed head. I think you still need to reverse the motor when you engage the backgear/low speed range so it might be useful to retain the head mounted For/Rev switch or you will need to add at least one extra button to reverse the inverter.

- Richard -

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Bottom#23 Top Feb-04-12 21:37:27

Re: Three phase supply to bridgeport

Hi all,
An update, I used an E2 series 2hp phase converter purchased from drives direct to drive the head, coupled to a remote pod (for stop, start, reverse and speed potentiometer). This along with an emergency stop switch and configuring the motor to run on 3 phase 220v.
The table feed was run on 240v using the transformer already incorporated in the origional mill switch cabinet. This gives the added benifit of low voltage supply to the lighting.
The coolant pump has not been sorted as yet, also I've not got a solution to the spindle / feed interlock.
The mill performs faultlessly and I am very pleased with the solution.
Richard

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