RE: [CAD_CAM_EDM_DRO] how to safely stall a DC motor

HI Jon, Lance,

From information from an EMCO 5" CNC lathe setup, I believe this is a
"holding" current. It serves as the detent.

Alan KM6VV

> -----Original Message-----
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] how to safely stall a DC motor
>
> Lance Hopper wrote:
>
> > I'm in the process of completely retrofitting an Emco Turn 120 cnc
> >lathe. It's got an 8 position tool turret on a ratchet mechanism,
> >driven by a small DC gearmotor (24VDC ~15watts) through a worm gear.
> > Would it be feasible to simply control the motor with a DPDT relay
> >that supplies 24VDC for forward operation, and then supply 5VDC and a
> >resistor of some value for reverse/stall operation?
> >
> > I'm not an electronics guru, so designing and building a circuit
> >would be very time consuming and difficult for me. I'll be
> >controlling everything with Mach 2. Thanks for any advice.
> >
> >
> Yes, this should work fine. But, I think you need one more relay to turn
> it off. It doesn't really keep the motor stalled ALL the time, does it?
> Or, just long enough to get the tool firmly seated?
>
> Jon
>