Re: [CAD_CAM_EDM_DRO] Re: Measuring backlash more accurately?

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