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
Newbie....but advanced question
Moderators: HopefulSSer, admin
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.
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?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.
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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!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
http://www.nickengler.com/Forum/vanilla ... e=1#Item_0
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
╟JPG ╢
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange