Re: [CAD_CAM_EDM_DRO] Chopper max voltage?

Thanks Dan,

I thought your board might be able. And I now recall you earlier
mentioning the onboard 7805 regulator. Sure, your board's overkill *FOR
NOW*, but it allows me to "change out" one component (this time, the
driver) at a time, and then the next 'round can be some shiny new "180
oz/in, 2A, 2.1 ohm stepper motors" (I think you have some good motors)!

Of course, that's after I get a rotary table. No speed improvements
would be OK (for now), and then I could also switch to step/direction
control, which also opens up other software, which...

Alan

Dan Mauch wrote:

>
> Sure it could drive those 24V .18 motors but it would be like putting a 500
> HP diesel engine into a tiny sports car. The reason Maxnc uses those .18
> motors is that they are inexpensive and don't draw much current. The parts
> to build that controller are about $10. The problem is that the motors are
> very high inductance so you wouldn't improve the speed much until you
> replace the motors with low inductance motors.
> The 2A driver boards use a 7805 to provide the 5 volts for the logic
> section of the circuit. This would get awfully hot and burn up if you tried
> to use 36VDC for the input to the 7805. That was the only reason that I
> recommend keeping the supply voltage down to 18VDC
> You can go up to 36VDC for the motor supplies but I would recommend
> providing a separate source for the +5 logic.
> Dan
> -----Original Message-----
> From: Alan Marconett KM6VV <KM6VV@...>
> To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
> Date: Thursday, October 05, 2000 11:05 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Chopper max voltage?
>
> >Dan,
> >
> >I know, let's ask Dan (for bare boards)! Sorry I didn't think of you
> >first.
> >
> >Your "3-Axis 2A Chopper Driver PCB" looks like an excellent starting
> >point for "home brew" drivers. It is rated: "Will run 4,6 or 8 wire
> >stepper motor 1 V to 18.V and rated current of .25 amps to 2 amps", any
> >possibility (with mods) that it could drive 24v .18a steppers? This
> >would allow step/direction use of the MAXNC low end "motion controller"
> >70 oz/in motors I already have, before I have to get "high performance"
> >motors.
> >
> >