Re: Gecko Faults

Did you say they are "direct drive" ? You will probably have to run
those motors through a 3:1 reduction (or so)if your lead screws are
5 turns per inch. 3 x 5 = 15 rpi. 15 x 1000(ppr) = 15000 pulses per
inch.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "kadeshan" <kader@v...>
wrote:

>
> Motors have 250 cpr encoders. Machine runs very smooth, turcite

ways

> and such, smoother than my mini mill was. I don't have motor

cables

> and encoder cables in the same tube, they are just temporarily

routed

> to machine. They are shielded cables. I don't have a ground

between

> machine and control. I can get them to run if i move them at like
> 1ipm without faulting so the motors leads are correct. Motor run
> fine when the aren't hooked up to mill.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bloy2004"

<jmnotions@c...>

> wrote:
> >
> > to really help you out one would need more information about

your

> > setup. The drive train ratio, the CPR of the encoders, friction
> > factors, etc. Given a full list of your system may enable

someone

> > to locate where or what is causing your drives to fault.
> > Since you said "fault almost immediately", sometimes a simple
> > reversal of motor connections will work, but that is just
> conjecture
> > at this point.
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "kadeshan" <kader@v...>
> > wrote:
> > >
> > > Here is a little background, just got an exact jr bare frame,

and

> > was
> > > going to add my own motors/controls. Here is the mill
> > > http://www.ameritechcnc.com/exact%20jr%20series.htm I asked

them

> > > what servos they use, and they said 16 ft lbs cleveland

servos.

> > > Direct drive. I got some off of ebay. I bought these motors
> > > thinking they would be sufficient
> > > http://cgi.ebay.com/ws/eBayISAPI.dll?
> > > ViewItem&category=42895&item=3849879999&rd=1 . I got

everything

> > > hooked up, I have the accel/velocity turned way down. They

fault

> > > almost immediately. Is there something I am doing wrong, or
> these
> > > motors just not up the the job at hand? Thanks