Was cutting some steel that was warping bad today, and kept having the torch not cut the entire way through (you know, the rooster tail of sparks). After investigation, I found that the torch was too far away from the material when the rooster tail occurred. This lead me to start testing my THC to see if it was behaving as expected as I have had trouble in the past with it.
I generated a 14" straight cut, and blocked up one end of my material to about 3" off the slats. A ramp test.
Starting from the high end of the ramp, I could clearly see the torch was not traveling down to follow the ramp even though the THC lights said “active” and “down” as well as my nominal voltage (roughly 142) and live voltage (varied as the torch traveled along its path and kept getting father from the material). Clearly the software wanted the torch to travel down to equalize the nominal and live voltages, but it just wasn’t keeping up.
My IHS and manually moving the z axis seem fine, so I doubt its a stepper motor issue. Does anyone have any ideas as to what I can do to try and narrow down what is going on here?