Re: [CAD_CAM_EDM_DRO] Limit and Homing switches

I'll put the scope on the thing and see if it wiggles. The problem that
I foresee with the X5 is that for every step the software issues, the
motor is going to turn 5 quadrature counts worth of rotation. If the
index pulse only occurs every 4 counts of rotation then it's possible
that index pulse could happen in the middle of those 5 counts and not
be asserted when the step is done. Things would probably be worse if I
was doint X10. I guess I'll just have to try it and see what happens.

I think you'll find the servo stuff a lot of fun. It's neat to see them
spin up pretty fast.

Drew

Alan Marconett KM6VV wrote:

>
> Hi Drew,
>
> Encoder parts (PCB's) are often built so they "could have" an index, but
> the extra parts may not be there. Hang a 'scope on it, and look! If
> TTL, you could probably get by using an LED and 220 resistor to +5V to
> "see" the index (very narrow). Move slow, and see if you can see find
> the index.
>
> I wouldn't think the 5X of the Gecko would come into play, but rather
> the resolution of the encoder. I know, let's ask Mariss!
>
> Sorry I can't be of more help. I'm anxious to get a pair of G340's and
> try out some servo's stuff myself!
>
> Alan KM6VV
>
> Drew Rogge wrote:
> >
> > Hi Alan,
> >
> > I was wondering if you could check me out on something. I'm currently
> > using servo motors with Gecko G340's. The encoders have an index pulse
> > (or at least a pin for one, should check that out I guess) and I was
> > hoping to use some sort of an AND gate to generate the home signal. I
> > think I may have a problem though because I'm using the G340's at a
> > X5 multiplier. For some reason I think this means the index pulse MAY
> > occur between "step pulses" from the computer. In other words it may
> > be the case that the index pulse happens "between" step pulses. Has
> > anyone else tried to use an index pulse with G340s in something other
> > than X1 mode?
> >
> > Drew

--
Drew Rogge
drew@...