Replies

1. 
   RickL | Mar 31, 2008 04:47pm | #1

   This question has been asked many times. Only motors with brushes can be speed controlled with those devices. If you loook at companies like Oneway, they are using three phase motors and VFD (variable frequency drives) and they still have a 2 step pulley because if you go too slow you loose torque and risk burning up the motor. The other option is a DC motor and varible speed drive controller, not to be confused with those speed controls for routers. Pretty pricey.

   Someone posted a link recnetly for a Penn State or someones small 1/2 hp motor and control for a variable speed mini lathe for $99.

    

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   Edited 3/31/2008 9:50 am ET by RickL

   
   

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   Edited 3/31/2008 9:52 am ET by RickL

1. 
   QCInspector | Mar 31, 2008 09:05pm | #4

   this is the discusion you mentioned.http://forums.taunton.com/fw-knots/messages?msg=40739.1

1. 
   RickL | Apr 01, 2008 12:15am | #5

   That's the one!

   http://www.pennstateind.com/store/tclvskit.html  $99 soution

2. 
   malloryjb | Apr 03, 2008 06:40am | #8

   Thanks for the info and help.

   Bruce

2. 
   xmike | Mar 31, 2008 04:54pm | #2

   I believe that the answer is....

   If it has an induction motor, like a table saw, grinder, drill press, many lathes, ... no.  Typically, induction motors have an operating speed in rpm printed on the name plate.

   If it has a universal motor like a router has, ...yes, usually.   But for best results the speed control should be a heavy duty one (around 15 amps rating) that was designed to control motors.

   Why not just ask Jet?

   Mike D

1. 
   malloryjb | Apr 03, 2008 06:40am | #9

   Thanks Mike for the info and help.

   Bruce

3. 
   JohnWW | Mar 31, 2008 05:50pm | #3

   Rheostats are simple resistance devices that reduce the voltage, which is fine for light bulbs and some electronic applications but it would reduce the power output of the motor drastically and lead to motor damage.

   If the motor on your lathe has brushes it can be controlled to some extent by an electronic control that pulses the power going to the motor without reducing the voltage. For a small motor like you have an ordinary house light dimmer will often do the job. Don't dial down too much at slow speeds, the motors can still be damaged because of overheating.

   John White

1. 
   malloryjb | Apr 03, 2008 06:41am | #10

   Thanks John for the info and help.

   Bruce

4. 
   flairwoodworks | Apr 01, 2008 03:53am | #6

   Bruce,

   As long as the rehostat is rated for the appropriate amps, you should be okay.  The thing with most VS lathes is that the torque is proportianate to the speed.  That is, when you turn the speed down on your VS lathe, you lose the torque when you need it the most.  Unless you are turning spindles, I would forget about the rehostat and get used to changing belts.

   Chris @ flairwoodworks

    - Success is not the key to happines.  Happiness is the key to success.  If you love what you are doing, you will be successful. - Albert Schweitzer

1. 
   malloryjb | Apr 03, 2008 06:38am | #7

   Thanks for the help and info.

   Bruce