axis clamping was Re: Measuring backlash more accurately?

Juha,

Calmping the axis is easy. A "missing pulse" detector circuit on the
step input line would easily allow for automatic clamping of any axis
which is not moving. BUT...

Getting that axis UNclamped when the pulses start again would be
problematic using this approach. I CAN think of ways, but they are
not trivial to implement...

However, the G code standard has codes for clamping and unclamping
axes. Although Art's plate is pretty full right now, I think you
might be able to do something in a macro (with only a "bit" of help
from Art). AIRC, the nist interpreter that Art has based Mach1 upon,
included at least one axis clamp; included for an older machine they
were retrofitting (Ray or Matt would likely know). So I'm pretty sure
the "guts" are already there, but Art may not have it "turned on" in
HIS code.

Anyway, you'd still need to hand code the clamping, as I don't think
any of the "hobby" post processors are savvy enough to do this for
you. Fred? VM?

Hope this helps,

Ballendo


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "justjuha
<juha.keisala@n...>" <juha.keisala@n...> wrote:

> One thing more for the backlash discussion.
> I'm rebuilding the Cincinnati 10VC-1000 milling machine. There is a
> possibility to brake the movement of an axis when it is not moving
> (original arrangement). I'm going to fit the machine with the

Rutex's

> drives and control it with Mach1.
> Is there any chance to implement such feature into the drive such
> Rutex R90 or R997, that it would be possible to enable the brake

when

> the servo drive does not drive the servo motor. What I would need

is

> just one change-over contact. Any ideas??
> I've asked this from the Rutex without responce.
> As you can see, I am also trying to get rid of the backlash

broblems.

>
> Rgds,
> Juha