how to get Mesa THC values

setp thc.scale-offset 119000 = frequency 0V ?

setp thc.vel-scale 0.00037866834 = 300v/(916100Hz - 119100Hz) = 0.000376411 aprox.

setp thc.correction-vel 0.0001 ??

echesortux wrote: setp thc.scale-offset 119000 = frequency 0V ?

setp thc.vel-scale 0.00037866834 = 300v/(916100Hz - 119100Hz) = 0.000376411 aprox.

setp thc.correction-vel 0.0001 ??

1- yes, is the measured freq at 0v
2- slope of the line, I prefer to make some measurements and calc a trend line on excel to get the slope value.
3- I use a modified THC comp, so I cant help you on this one.

setp thc.correction-vel 0.0001 ??

This is by how much the value will change while correcting the height, to high and the torch will bounce like a bunny, to little and it will be to slow at going up or down, so you have to test some values there to get smooth movement. That is dependant on your setup, speed of Z axis, delay on the motor drives, etc.

echesortux wrote: Hi John, how do you get this values? I am trying to understand your plasma.hal to using with my machine.

setp thc.scale-offset 119000
setp thc.vel-scale 0.00037866834

# this might need to be increased
setp thc.correction-vel 0.0001

thanks

The THCAD manual tells you where to get the scale offset number, it's different for each card a bit I think.

JT

Thanks John.

BigJohnT wrote:
The THCAD manual tells you where to get the scale offset number, it's different for each card a bit I think.

JT

The manual will tell you to look for a sticker on the back of the THCAD card. I forgot to write it down before mounting the card too so when I pull the card up I am going to make my own sticker and attach it beside the THCAD in the enclosure.