Shopsmith Forums

Hi

I was wondering what the motor data is, like frame type. I was thinking of using a 3 phase motor with a VFD drive to help eliminate the SS speed control.

Of course I have to figure out how to disable the speed control correctly.

If this has already been done, please let me know.

Thanks

The Shopsmith motor is in a 48 frame and is rated at 1 1/8 HP at 3500 rpm.

The use of a variable frequency controller will give you speed control, but the results at the shaft will not be the same as with the variable pitch pulley system.

When you lower your speed with the variable frequency drive, the HP decreases proportionally (constant torque). Thus at lower speeds you won't have very much power.

The variable pitch pulleys multiply torque as you reduce speed. Many of us set the speed dial down to around "O" when we have to do heavy ripping. This gives us more torque at the cutting tooth to get the job done.

I don't think you will be satisfied at all with a variable frequency control.

8iowa wrote:The Shopsmith motor is in a 48 frame and is rated at 1 1/8 HP at 3500 rpm.

The use of a variable frequency controller will give you speed control, but the results at the shaft will not be the same as with the variable pitch pulley system.

When you lower your speed with the variable frequency drive, the HP decreases proportionally (constant torque). Thus at lower speeds you won't have very much power.

The variable pitch pulleys multiply torque as you reduce speed. Many of us set the speed dial down to around "O" when we have to do heavy ripping. This gives us more torque at the cutting tooth to get the job done.

I don't think you will be satisfied at all with a variable frequency control.

So leaving the speed control in the highest setting and using the vfd wouldn't work?

buck50bmg wrote:Hi

I was wondering what the motor data is, like frame type. I was thinking of using a 3 phase motor with a VFD drive to help eliminate the SS speed control.

Of course I have to figure out how to disable the speed control correctly.

If this has already been done, please let me know.

Thanks

If you are not aware of the soon to be made available Shopsmith Power Pro motor/headstock/conversion, You may want to check it out b4 going to all that effort!

http://www.nickengler.com/Forum/vanilla ... e=1#Item_0

Well if I still use the speed control, I could eliminate the need for the speed reducer or increase and have the ability to go in reverse.