I do vfd speed controlled 480 volt 3 phase induction motors and controls at work quite a bit. When purchasing a motor that will be powered by a vfd you need to specify vfd rated insulation due to the impulses generated by the vfd. Many motor companies are moving to all their motors with this insulation class. These motors have a definite ringing sound when the start and run. Thanks, CharlieCirclotron wrote: ↑Mon Apr 29, 2019 12:04 amI wouldn't expect a VFD to do anything useful driving a brush motor. Those motors are insensitive to AC supply frequency as shown by the fact that they will also run on DC.
D.C. scr drive speed control for die grinder
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Re: D.C. scr drive speed control for die grinder
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Re: D.C. scr drive speed control for die grinder
Class, if I remember correctly you have a H.F. electric die grinder? In my opinion it can not be compaired to a new style Dewalt or old aluminum Makita die grinder. I found the H.F. heavy, gutless with horrible runout. Basically unusable. Thanks, CharlieClassAct wrote: ↑Sun Apr 28, 2019 8:52 pm
I port with both and almost never use an electric grinder. I have way more control with air, the grinder is lighter and the compressor is outside so I don't hear it. Even if I did have to hear the compressor, I'd still use air.
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Re: D.C. scr drive speed control for die grinder
I actually have a Craftsman electric grinder and a Mikita which I don't remember the model.Carnut1 wrote: ↑Mon Apr 29, 2019 6:33 amClass, if I remember correctly you have a H.F. electric die grinder? In my opinion it can not be compaired to a new style Dewalt or old aluminum Makita die grinder. I found the H.F. heavy, gutless with horrible runout. Basically unusable. Thanks, Charlie
Re: D.C. scr drive speed control for die grinder
Often wondered if something like this would be a solution
https://www.woodcarverssupply.com/110V- ... fo/799001/
They have a tabletop/hanging rotary tool with handpiece that accepts 1/4 shank too just don't know if it will hold up to the abuse of porting...
https://www.woodcarverssupply.com/110V- ... fo/799001/
They have a tabletop/hanging rotary tool with handpiece that accepts 1/4 shank too just don't know if it will hold up to the abuse of porting...
Last edited by tt 383 on Mon Apr 29, 2019 12:09 pm, edited 1 time in total.
Re: D.C. scr drive speed control for die grinder
pm me the model of that Makita. I may be interested in buying it from you. Thanks, CharlieClassAct wrote: ↑Mon Apr 29, 2019 11:41 amI actually have a Craftsman electric grinder and a Mikita which I don't remember the model.
Servedio Cylinder Head Development
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Re: D.C. scr drive speed control for die grinder
These usually just reduce voltage which kills the torque.tt 383 wrote: ↑Mon Apr 29, 2019 12:07 pm Often wondered if something like this would be a solution
https://www.woodcarverssupply.com/110V- ... fo/799001/
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST
631-816-4911
9:00am - 9:00pm EST
Re: D.C. scr drive speed control for die grinder
Ohh, ya thats no good then.Carnut1 wrote: ↑Mon Apr 29, 2019 12:09 pmThese usually just reduce voltage which kills the torque.tt 383 wrote: ↑Mon Apr 29, 2019 12:07 pm Often wondered if something like this would be a solution
https://www.woodcarverssupply.com/110V- ... fo/799001/