| THCUD(9) | HAL Component | THCUD(9) |
thcud - Torch Height Control Up/Down Input
loadrt thcud
Torch Height Control This THC takes either an up or a down input from a THC
If enabled and torch is on and X + Y velocity is within tolerance of set speed allow the THC to offset the Z axis as needed to maintain voltage.
If enabled and torch is off and the Z axis is moving up remove any correction at a rate not to exceed the rate of movement of the Z axis.
If enabled and torch is off and there is no correction pass the Z position and feed back untouched.
If not enabled pass the Z position and feed back untouched.
Typical Physical Connections using a Parallel Port
Parallel Pin 12 <= THC controller Plasma Up
Parallel Pin 13 <= THC controller Plasma Down
Parallel Pin 15 <= Plasma Torch Arc Ok Signal
Parallel Pin 16 => Plasma Torch Start Arc Contacts
HAL Plasma Connections
net torch-up thcud.torch-up <= parport.0.pin-12-in
net torch-down thcud.torch-down <= parport.0.pin-13-in
net torch-on spindle.0.on => parport.0.pin-16-out (start the arc)
net arc-ok thcud.arc-ok <= motion.digital-in-00 <= parport.0.pin-15-in
(arc ok signal)
HAL Motion Connections
net requested-vel thcud.requested-vel <= motion.requested-vel
net current-vel thcud.current-vel <= motion.current-vel
PyVCP Connections In the XML file you need something like:
<pyvcp>
<checkbutton>
<text>"THC Enable"</text>
<halpin>"thc-enable"</halpin>
</checkbutton>
</pyvcp>
Connect the PyVCP pins in the postgui.hal file like this:
net thc-enable thcud.enable <= pyvcp.thc-enable
John Thornton
GPLv2 or greater
| 2023-02-10 | LinuxCNC Documentation |