Re: [CAD_CAM_EDM_DRO] Re: Treadmill motors as Servos

Hi John,

If they run smoothly in both directions then you are on to a winner. I
know these motors are cheaply made but they work surprisingly well. My
lathe has proper brushed servos on it and I can't say I have noticed any
real difference in performance.

As you are using a fairly low resolution encoder you don't need a step
multiplier. With a 200 line encoder you will have a top speed of 1875
RPM at 25kHz. If you need more speed, Mach will go up to 45kHz.

Les


kz1927 wrote:

> Hi Les,
>
> Yes, they run smooth in both directions on a AA camera battery
> that's about half dead (it won't work in the camera).
> I hooked them up to an 18V. Dewalt battery, look to be running
> around 800 rpm (wild guess), and hard to stop by hand.
> Fine in both directions.
>
> I'm not after high speed or super power as much as reliability.
> All I want to do is cut out the same shapes in MDF or plastics
> as exact as is possible from one to the next.
>
> I don't generally leave it unattended, except to run and get
> a cold drink in the next room. But with the way it is now, I
> have to watch it like a hawk.
>
> I have 2 desktop routers for engraving pictures that use Dave's
> Hobbycnc board. Those things are so reliable (I can't recall even
> a concern about missing steps) that I'd probably take my wife
> shopping while it runs unattended. Wonder how long That could take??
>
> I think I have to at least try this.
> I'll use the Gecko's like you suggest.
> If I had to get better motors at least I'd be that far along.
>
> It'll be Monday before I can order the stuff, but what I'll
> do is keep a running file of how and what for the next guy who wants
> to try this.
>
> Do you think a step-multiplier in the G340 would be to any
> advantage(as opposed to the G320)..(Gecko)?
>
> I'm very grateful to you for your time and very clear answers.
>
> Thanks again Les,
>
> John
>
>
>