Re: VSD QUESTION

THANKS BOB, MY MISTAKE THE SPEED IS 11000RPM AND NOT 1100RPM AND
HOPEFULLY I WILL HAVE ENEOUGH TORQUE WITH THIS.

JOHN

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
> 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
>