Re: [CAD_CAM_EDM_DRO] Re: VSD QUESTION

john_glynn57 wrote:

>THANKS BOB I AM USING THE SPINDLE TO DRIVE A DIAMOND GRINDING WHEEL
>TO CUT A TUNGSTEN CARBIDE TOOL. THE WHEEL IS 40MMM IN DIAMETER AND I
>NEED APPROXIMATELY 20M/S WHICH REQUIRES ABOUT 1100RPM. THE MAKITA
>SPINDLE RUNS AT 23000RPM
>
>

The motor cannot put out any more torque at 1100 RPM as at 23000.
If it is a 1/2 Hp router at 23,000 RPM, it will produce 0.02 Hp at
1100 RPM. Will this be able to remove enough material for you?
My guess is that you will be able to stop it with your fingers by
touching the 40 mm grinding wheel.

Also, the air cooling will be reduced by the square (I think that's right)
of the speed change, so you will get 1/437 of the normal cooling.
You'd better provide an external cooling blower or the motor will be
toast.

Jon