Bridgeport 3 phase to single phase

I don't think much of your economic decision. You'll lose the ability to plug reverse the machine, which, to the uninitiated, may illicit a "so what?" response. Only when you understand the proper operation of a drop spindle mill will that have any value for you, then it's too late.

Spend your money getting the three phase service via a rotary phase converter, not replacing the motor. That's a decision you won't regret. Ebay can be your friend in this instance-----watch for a 3 phase step-up transformer.

Harold

If he's going to do a rotary converter he would be better off either stepping up the voltage with a less expensive single phase transformer before the converter and using a cheap-because-nobody-wants-it surplus

Pete C.

Yep! I agree.

Harold

Buy the appropriate C-frame motor, and make a switch mount and a motor mounting ring and wire it up. Look at your existing motor and make sure you get a replacement that has the same shaft size, as you'll be swapping the pulley old/new.

GWE

I'm be surprised if you couldn't find a used 3 phase motor and a capacitor only phase converter for less than a 2 hp single phase motor. A single phase motor will not instant reverse like a three phase motor will, even if the three phase motor is run from one of the above mentioned phase converters. ERS

Todd, If your ok with losing reverse..... I dont see why you can't convert it to 230V single phase. I might be able to help you get a single phase motor for it. There is a Frame designation on your existing motor is it 145TY-4 ??? Also verify the RPM printed on the label it sould something like 1750 or 1800. If its diffrent let me know. I should have a line on what you need for it. Keep in mind that a 2HP single phase motor might not have the muscle of the 3ph, however if your an average user you'll never know the difference.

If loosing reverse is a serious problem, (it would be for me) youll need to rewire, rewind (a good motor guy can do that), or buy a 3ph

Ryan snipped-for-privacy@cruisecontroltools.com

Note that if you want to plug reverse a motor running inertial loads (all those pulleys and spindles), you may need to size the phase converter more conservatively (ie get a bigger one).

I would think having reverse is absolutely essential - can't use low range and standard tools without it...

I think what he was talking about is the ability to "plug" reverse. That is, just switch the windings while it is running forwards, and suddenly it is running in reverse.

You can't do this with the typical capacitor start single-phase motor, in part because the speed of the motor will keep the start winding from ever engaging until you coast down to almost a dead stop. Just throw the switch to reverse, and it will keep going forwards at full speed.

And plug reversing is important when you are doing tapping with the mill. Skip that, and you break off a tap in the bottom of the hole. (Well ... if you have a tapping head like the TapMatic ones, the reversing is built into the mechanics of the head, but for "rigid tapping", you have problems.)

Personally, I have gone the VFD route, though I started with a

Enjoy, DoN.

Very much true. Not to mention losing the ability to tap quickly and easily.

Gunner

"A prudent man foresees the difficulties ahead and prepares for them; the simpleton goes blindly on and suffers the consequences."

- Proverbs 22:3

Hi

I take it fro your voltage, that you are in Canada. What I did in my shop is buy a 7500va 220-600V single phase transformer and hook up a VHD to my mill, my drill press etc. None of the VFDs i used were rated for single phase but three of the four that I bought worked. I have an AB 1333, an AC Tech and a Hitatchi j100. I have also mounted a single phase motor on a Bridgport but this is not that easy. If you are in Southern Ontario I can help you find a used transformer and VHD. I think you could get a transformer for $150 and a VHD for about $150.

Hi,

Your right that I am in Canada. But, down east in Nova Scotia. The checking around that I have done I have found that there isn't a direct replacement for the 2hp 3ph. The way you have done it sounds like the way to go. If you can provide me with some names/numbers on where to start looking for what I need, it would be a big help. Also is it straight forward on the hook-up of all the required systems? I have been a machinist for 20 years and I'm also pretty good with electrical systems so I understand the tech talk.

Thanks, Todd