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Small Vimarc (Read 250 times)
 
Jeff Enck
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Yarmouth, Me., Maine, USA
Yarmouth, Me.
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Small Vimarc
Mar 22nd, 2017 at 8:07pm
 
I have a chance to buy a small bench top 10" or 12" throw lathe. I would like to convert to variable speed. I don't think the fractional hp motors use a vfd drive and 3 phase motor. Can anyone tell me how speed is controlled on these small lathes? I heard someone makes a conversion kit, anyone familiar with thar?
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Bill Rockwood
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Buena Park, California, USA
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HF 1236 (34706)
Excelsior 10x18
HF 8x12 (95607)
Re: Small Vimarc
Reply #1 - Mar 23rd, 2017 at 12:19am
 
Jeff, this one from PSI is all i am familiar with:

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Ken Vaughan
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Juneau, Alaska, USA
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Stubby 750
Jet 1014 vs
Bonnie Klein Lathe

Re: Small Vimarc
Reply #2 - Mar 23rd, 2017 at 6:40am
 

Jeff

I have a little Jet 1014 vs which is a rectified dc motor and also have a psi dc motor (rectified) I got for powering a small lathe.

I have a 2 hp VFD lathe also.

Biggest issue with the DC motors is when the rpms of the motor drops below 40-50 percent of full speed, the torque drops off quickly as rpms continue to decrease.  This creates the choice between stalls and belt changes. 

The PSI motor I have has some marketing hyperbole on the HP rating.  Mine has the pots that can be unsealed and tweaked a bit to change the minimum speeds, bu the pots do not change the loss torque.  (Marketing cannot change the laws of physics).


My VFD lathe also has torque loss at low speed, but starts with lots more.

Brushless DC is a bit better on torque, but cost  more.  The ones I have are small so have not run them on a wood lathe.

I like the VS on the small lathes, but have adapted to work around the limitations.
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Jeff Enck
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Yarmouth, Me., Maine, USA
Yarmouth, Me.
Maine
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Re: Small Vimarc
Reply #3 - Mar 23rd, 2017 at 7:52pm
 
Thanks for the comments, I also found that Rikon has a kit, that I think is an AC motor, on Amazon for $ 283.00. Need to learn more about it, info on Amazon is sketchy.
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