Delta Unisaw - Woodworking Talk - Woodworkers Forum
 
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post #1 of 5 Old 01-03-2009, 07:41 PM Thread Starter
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Delta Unisaw

I just got a Delta Unisaw that was built in the 50's. Wired for 440 and 3 phase. So that I can use it in my home shop I changed the wiring so that the motor could run at 220 and added a phase converter to go from 3 phase to single phase. It works ok but, bogs down when ripping anything thicker then 2 inches. If there is anyone out there with any tips that can help get this jem to run at maxium power. Pleae help !!!!

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post #2 of 5 Old 01-03-2009, 09:00 PM
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Assuming your using a static phase converter you lost 1/3 of your horsepower. There is three legs/wires on 3 phase. The statics only provide 2 legs of power. I am not sure of the details but I think it provides 3 legs to get it to start? But if that is what you have odds are there is nothing you can do. Assuming everything is working correctly.

The best way to go is with a rotary converter. It actually provides all 3 legs and with a properly sized converter there is no power loss. And the best part is that you can run other 3 phase machines which are typically cheaper than single phase machines. Used machines that is.

Other option is replacing the motor with a single phase motor. But that is almost the same price as you can build a RPC for.

Last edited by Kudzupatch; 01-04-2009 at 08:54 AM.
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post #3 of 5 Old 01-03-2009, 10:49 PM
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Couldn't you just replace the motor with one wired for 220?
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post #4 of 5 Old 01-04-2009, 07:34 AM
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Unless you plan on getting more 3 phase equipment the easiest thing to do is change the motor. There are used ones for sale pretty regular. There are some very cool old machines that have the motors built in that are 3 phase and you can't change the motor. If you ever thought you might be getting something like that then the RPC would be nice to have. If not it's just one more thing to have to maintain. There is a web site exclusively devoted to Old Wood Working Machines. It's called OWWM. They can be a big help with these kind of questions. You can get directions on how to build an RPC there if your into that. There is also a classified section that you might find the motor at.
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post #5 of 5 Old 01-04-2009, 09:28 AM
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Good luck with the saw and welcome to the forum. Red

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