Re: [CAD_CAM_EDM_DRO] Thanks - was: Things to check? is now: RUNNING~!

On Thursday 18 September 2003 01:38 am, Tim Goldstein spake:

> High over voltages (like you have) yield hot motors even if the current
> is set within limits.

No, no... we're down to 75VDC now, thanks to Mr. Variac.
(...and what a kewl little thing he is, too...)

> Good explanation and graphs in the Gecko stepper
> white paper (a must read).

Printing now...

> So, if you are sure the current is set
> correctly (you can always reduce it just to try) and you are still
> getting hot fast then you know it is because you pushed the upper limit
> on the over voltage.

Well, these are 7.5A motors according to the paperwork, but I might
just try and drop them down to 6A on the Geckos to see what happens.
(resistors are cheap)

> > Motors *SEEMED* a bit slow for my likes...
> > Is there a way to speed them up?
>
> No. You are already at the voltage limit of the drive. This is assuming
> that you are not running out of pulse from the computer. If you have not
> yet pushed them to the limit step wise where they are stalling then you
> may be able to speed them up by feeding them more pulses.

800Mhz PIII - how do I speed it up? (the pulses)

> > Also, the Z axis motor seemed to be "hunting" all the time.
> > (do steppers need "tuning" also?)
>
> Geckos have a pot for adjusting the midband stabilization. Other than
> that there is not tuning. The motors should lock in at rest and not hunt
> at all.

I'll look at that...

> > What is the "recommended" setting for "steps" in the Geckos?
> > Full, half, or less?
>
> Depends on your machine and computer. 10X multiplied will give you the
> smoothest running as you are the least dependent on the smoothness of
> the controller program pulse stream. But, it also gives the worst
> resolution. 1X gives the highest resolution, but requires the highest
> pulse stream from the computer. You will need to pick a setting such
> that your computer can put out a sufficient pulse stream to drive your
> motors at the speed you want. Depending upon the software and the
> mechanical reduction you sometimes have to balance the setting between
> resolution and speed.

I think this might be where I'm getting confused...
I'm looking at the G210 guide that came with the Geckos, but only
see the "full step", "half step", "5u step", & "10u step" jumper selections.

Would the "full step" be 1X, and the "10u step" be 10X?
Is this resolution you speak of related to encoder feedback?
In other words, if I get the encoders wired up and the DRO board
in place, will this help with this resolution, or is that something different?

And why would multiplying the steps give me poor resoltion?

I'm confused again...

Weyland