Replies

1. 
   chrisindiana | Dec 25, 2002 01:47am | #1

   I would replace the motor. It should be simple to do. It takes a 3/4HP, 1725 RPM, 56 frame, 115/230v, TEFC,  single phase motor.  You may also need a different switch or rewire the current switch. Motor link below.

   http://www.electricmotorwarehouse.com/singlephase_menu.htm

2. 
   MStehelin | Dec 26, 2002 10:23pm | #2

   I don't know what the cost of a new motor is but You  can get a phase-o-matic converter for $200 or $300 bucks. It is a static converter. I have one for my Radial arm saw and my band saw. Works.

   Cheers

   Mitt

1. 
   LeeEschen | Dec 27, 2002 02:14am | #3

   A static converter will lose about 1/3 of the motor's rated HP. A rotary converter, much more expensive, will maintain the rated HP.

   Replacing the motor will be much more efficient, both in terms of the dollars spent, and in terms of the cost of electricity to run the lathe.

   --

   Lee in Cave Junction, Oregon

   On the Redwood Highway

1. 
   bobhallsr | Dec 27, 2002 07:42am | #5

   Lee, your analysis of static and rotary converters is accurate.  There is a third kind which, as I understand it, converts ac to dc and produces a 3 phase ac output. The unit acts as frequency generator, thus controling the speed of the 3 phase motor, and as a reversing switch.  It will produce a soft start and when the power is cut it acts as an electric brake.  My son brought in his new Mitstbushi and hooked it up to my 5 horse powermatic cabinet saw.  ( I bought the saw for $150 and I had to check the motor before I spent more money on it.) The performance was amazing.  I'm now looking for one on E-Bay.  I just wish I'd taken his advice a year ago and bought one when it was available cheap as excess stock.

   BTW, Son operates his 3 phase Bridgeport Mill using a second 3 phase motor as a converter.  The converter motor is star wound and will start running on its own when the swithc is turned on.  A delta wound motor will need to be spun to get it started.  The converter motor just sits there and spins and the working motor is turned off and on as needed when he is milling.  There is some inefficiency with this method but it hasn't been a problem with the milling mchine.  I have a friend who runs a whole machine shop this way.

   BJ

   Gardening, cooking and woodworking in Southern Maryland

   Edited 12/26/2002 11:54:25 PM ET by Bee Jay

3. 
   dondownunder | Dec 27, 2002 06:55am | #4

   Joe

   I'm assuming that the PM doesn't already have variable speed drive (as opposed to changing pulleys/belts to achieve speed changes) when I suggest you investigate phase converters which can be used as a speed controller. This would mean spending $ on gaining variable speed rather than changing the motor.

   Some of your compatriots would be better placed to advise on the types available for your 110v current supply.

   The lathe is one woodworkers' machine which  benefits incredibly from a variable speed conversion.

   Compliments of the season to all,

   Don