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22nd Jun 2015, 01:25 AM #61Golden Member
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22nd Jun 2015, 11:39 AM #62Member: Blue and white apron brigade
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From what I can see the motor has been left in star winding connection mode otherwise there would be a pair of wires from the inside of the motor coming back to each connection point.
This means it will only generate 1/2 the power therefore restricting the usable power band.
This is a problem for machines like DPs and lathes etc the slower speeds are usually where the greatest power is needed but as TS mentioned he is a woodworker so it might work out for him.
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22nd Jun 2015, 11:52 AM #63
BobL is correct it was left in star winding and yes I am a woodworker.
I hope to have the drill press fully restored in a month.
At that point I will run the drill press through its paces, drilling assorted size holes in assorted timbers.
Then we can see in real terms if sticking with the three phase motor and pairing it with the VFD was a good idea or not.
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22nd Jun 2015, 12:27 PM #64Member: Blue and white apron brigade
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The areas where I can see problems is in large holes using spade/Forstner bits and when using hole saws.
Even at full power (i.e. @ 50Hz) and set on the optimum pulley parings, with only a 3/8HP it will struggle.
But as you say, nothing beats trying it out and in the meantime a bigger and better motor may come along which will save the trouble of conversion.
FWIW I waited for over a year for my 1.5HP Leeson motor to come along. It did not need any delta to star conversions as it was dual connect at the terminal box. It's a great little motor and I am glad I waited for it.
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22nd Jun 2015, 01:18 PM #65Most Valued Member
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22nd Jun 2015, 02:00 PM #66Member: Blue and white apron brigade
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22nd Jun 2015, 05:58 PM #67Cba
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have restored a Waldown 8S too. initially I did also restore and repaint the original 1ph 1HP motor. But before putting all back together, I decided to uprade to VFD. I used a 240V V/Hz type 1HP Lenze VFD (which I already had), and bought a new 1HP 3ph CMG motor to go with it. I am very happy with performace.
I suggest the OP keeps his 3/4HP VFD, and gets a new 3/4HP 3ph 4-pole 240V motor to suit. 3ph motors are really the cheapest motors there are. There are usually some new ones on eBay for $ 80 to 90. They are chinese made - but so what, the CMG I have is made in China too, so I was told by the motor rewing shop I bought it from. Fitting to the Waldown was no problem, If I remember well I may have had to bore the pulley a bit larger because the original motor was imperial and the new one was metric:
http://www.woodworkforums.com/showth...89#post1799189
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22nd Jun 2015, 07:58 PM #68Most Valued Member
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22nd Jun 2015, 09:25 PM #69Golden Member
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