THC config that works.

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11 years 7 months ago #57416 by groblerjf@gmail.com
Hi,

For some reason on the config that I did install, the values for the step increments for the THC, the travel height, pierce height and switch travel does not seem to always take effect immediately after I have changed them. For example, at first when I adjusted the switch travel it did work somewhat, but usually when I did change it, it had no effect on the movement of the torch after the plate was sensed.
With the step increments I slowly increased the value once because the torch was not moving up fast enough, I then change the value to something ridiculous like 2 mm and the effect seem to have took place but when I changed it back to a much smaller value, the torch still moved as if the value was 2. It was only fixed once I restarted LinuxCNC.

I did however 'fix' the problem by changing the default values to the values that I desired, and that works perfectly now.

Regards

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11 years 2 months ago #61139 by Ziggy
Replied by Ziggy on topic THC config that works.
All works fine, thanks for the hard work and effort. I like the simplicity, but is there a way to adjust the velocity of the Z-axis when probing the plate. I use a z-axis with rack and pinion.
Ziggy

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11 years 2 months ago #61150 by BigJohnT

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11 years 2 months ago #61209 by tommylight
Replied by tommylight on topic THC config that works.
The F for feed rate does not work when probing for material, so you need to set the correct speed in the .ini file for AXIS 2 under max_velocity.

Regards,
Tom

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11 years 2 months ago - 11 years 2 months ago #61220 by BigJohnT
Replied by BigJohnT on topic THC config that works.
The F feed speed works for everything except G0, G33, G33.1 and G76. There is no ini setting for probe speed.

For example my plasma touchoff subroutine:
Code:
o<touchoff> sub (#1 pierce height, #2 pierce delay, #3 cut height) F10 G38.2 Z-1.75 (Probe to find the surface) G0 Z[#5063 + 0.07] (Move to Probe Trip point + switch hysteresis) G92 Z0 (Set Z zero) G1 Z#1 M3 S1 M66 P0 L1 Q5 (Wait for Arc OK from Torch) G4 P#2 (Pause for pierce delay) F25 Z#3 (goto cut height) o<touchoff> endsub M2

JT
Last edit: 11 years 2 months ago by BigJohnT.

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11 years 2 months ago - 11 years 2 months ago #61290 by Ziggy
Replied by Ziggy on topic THC config that works.
Hi, Tom/JT.

I changed the max-velocity in the .ini file and also as per an earlier post by bubels I uncommented a line. (the Z-axis is controlled by thc.hal and not via G-code in the case of the Toma THC)

linuxcnc.org/index.php/english/forum/49-...works?start=20#50427

The Z-axis is probing correctly now.

I also cut a warped plate and it appears that the THC is working correctly.

A further question I have is if there is a way to switch off the THC when cutting small holes and arcs (via an M command?), or is this handled in the thc.hal?

Regards,
Ziggy
Last edit: 11 years 2 months ago by Ziggy. Reason: Signature change

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