THC dive

[mckee ironworks]

This is an interment Issue that I have had since new.
hypertherm powermax65 .
candcnc bladerunner
sheetcam
In cam i set my THC to 3 inches.
Every now and then on cuts over 3 inches (1 out of 10)
The torch moves to position touches off and starts to move then dives into the sheet drags for about the first .250 then jumps up into thc control. My cut is fine it works. but that drag just isn't right.

[djreiswig]

Sounds like your pierce and cut height are wrong. Does your z move the correct distance that it is commanded to? Maybe your steps are off on your z and it is moving more than it is supposed to. Physically measure what your pierce and cut heights are and confirm that they are correct. Sounds like the THC is working correctly since it raises the torch up after it turns on.

[weldguy]

Does your torch fully pierce the material before the XY motion begins on these random occasions? If the arc has not transferred to, and pierced the material before the XY motion begins this could happen. THC could be seeing high voltage, lowering the torch to resolve that, then the arc transfers properly resulting in accurate arc voltage for the current height which is too close the material so the THC raises the torch to your preset cutting height.

[mckee ironworks]

Weld guy yes everything works like it should. Except that dive.
I caught a video of it. I will post a video on youtube. I will reply back with the link.

[mckee ironworks]

this is the link on youtube of the dive .

[djreiswig]

Can't see the video.

[mckee ironworks]

Sorry new at this.

https://youtube.com/shorts/hz1X3KGy0Ag?feature=share

[adbuch]

I really can't tell anything from your video. If possible, take a higher resolution video to upload to Youtube so we can see it full screen with a better view of your torch head.
David

[weldguy]

I can see the dive your talking about, hard to see if your looking at the torch but look at the v bearing David you will clearly see z axis drop a signifigant amount. Can you determine what line of gcode is causing this and let us know what that line of code contains?

[Burner8669]

So I’m having somewhat of a similar issue but I can’t seem to find out if it’s in the nesting program or in the thc but when I’m cutting the pierce point and lead in are causing a torch collision when the part is exiting the cut. It dives into the cut line any tips on how to get it to stop?

[Burner8669]

So my issue was coming from the nesting software it was going over previous cut to end the cut did some editing in the program for the starts and stops and now we’re running smooth.

[weldguy]

So my issue was coming from the nesting software it was going over previous cut to end the cut did some editing in the program for the starts and stops and now we’re running smooth.

That will certainly do it. Thanks for posting back with your solution