Re: Measuring backlash more accurately?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Bob Simon <bsimon@q...> wrote:

> At 12:20 2/19/2003 -0600, you wrote:
>
>
> >justjuha 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.
>
>
> >You are trying to get rid of backlash with a brake? Do you mean

an axis

> >clamp?
>
> I missed most of this thread, but I'll throw in my $.02. The

Cincinnati

> 10VC has a brake on the Z-axis only. It prevents the spindle

carrier from

> sliding into the table when the servo drives and compressed air
> counterbalance are disabled. The brake requires 24VDC power to it's
> armature to disengage. You need to apply the power when your z-axis

drive

> is enabled. (and you have air pressure)
>
> I used a TTL output pin on my servo amplifier to drive a solid

state relay

> in series with the original "master start" relay contacts.(4CR ?)

If the

> drive dies, over travels, or faults, the brake will go on and

prevent the

> spindle carrier from dropping into the work piece.
>
> -Bob

Jon, You can call it as an axis clamp as well, I was just going
through the diagrams and I noticed that there was a contact for the
axis brake. In the diagram it was called brake, not clamp. Bob could
be right, maybe it was for the z-axis only, so you won $.02. There is
a huge heap of papers, so it is a big job to find the right page
again. I am jus beginning with this project and there is lot of
things to go thru. Among other things, one thing will be the tool
changer. I do not have a faintest idea, how to do this with Mach1,
but that is an other case...

Juha