RE: [CAD_CAM_EDM_DRO] Spindle Control, using Hydraulics?

Considering the energy loss going from motor to hydraulic and back to
rotation, it might be worth looking at removing the hydraulic system
entirely and using a 3-phase motor with VFD attached directly to the
spindle. Shouldn't be too hard to make an adapter plate unless the
hydraulic motor was custom made for the machine.

That said, you could use a servo or stepper to adjust the displacement
of the pump.

Dave

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of danieltmedlin
> Sent: Saturday, January 21, 2006 7:50 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Spindle Control, using Hydraulics?
>
>
> Would it be possible, within reason to control spindle speed with a
> hydraulic unit?
>
> On my Lebond lathe the electric motor turns a variable displacement
> hydraulic pump that drives hydraulic motor, which turns the
> spindle/chuck.
>
> I wonder if a stepper motor could move the stroke control for
> the pump
> in a closed loop feed back system using Mach3 with a signal from a
> encoder on the spindle?
>
> Daniel T. Medlin
>
>
>
>
>
>
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