Re: [CAD_CAM_EDM_DRO] hydraulics with CNC

Todd W. Syssa wrote:

>My hydrualic application is a tube bending
>machine...not a milling or turning application...
>
>I have a rotary encoder hooked up to the bending
>spindle...it has 4000 pulses per revolution. This
>spindle is pulled (by leaf chain wrapped around a
>drum) by a relatively large hydraulic cylinder.
>
>The kind of force needed in this application will not
>allow me to run stepper motors as it is 40,000 lbs of
>pulling force...but the system runs smoothly and
>accuracy can be low (compared to a milling machine).
>The machine bends the tube until you let go of the
>electric pushbutton.
>
>I realize mach 2 only allows you to control steppers
>(I think) and does not have any provisions for closed
>loop feedback but I have to believe there is some way
>to do it maybe with maybe Turbo CNC?
>
>

The only software I know how to do this on is EMC. It is designed
from the ground up as a closed-loop (in the PC) servo system.

I have an analog servo interface for it, and I could give you
instructions on how to build an interface/amplifier for a
bidirectional proportional servo valve.

Jon