What do you think was going on here

CrossFire ®
1

I was cutting the clock and the CNC kept stopping like in the video. I thought the ground wasn’t solid enough and that it was hardened steel so I clipped the ground to the work. No difference.

Ultimately I recompiled the drawing and it worked but used the same tool library. The second blade worked fine, even clipping the ground to the table it was fine.

I did try the pierce delay adjuster in the CNC software and the torch pierced, and started cutting but then the THC Started to raise up, it looked like it wanted to take off like a rocket. Was this the pierce delay % decrease setting I used in the CNC software? What does that even do? I know sometimes I need to slow the speed down on the fly and I use -10 etc….

When I recompiled and got a new old blade, it worked fine.

2

If pierce delay is an issue, just post new G code with the correct pierce delay.

As for the “rising” while cutting, that always seems to be attributed to EMI.

(Work clamp, not ground).

3 Likes
3

Agree with KwikFab as the rising torch is related to “hunting” for the voltage so possible EMI issues.

It could be the USB port on your computer. If using a laptop, perhaps the computer is shutting down resources.

A thought on THC: Strictly speaking you would not need that with that rigid saw blade. You could turn it off and let IHS find the surface and cut height.

But I realize you want it to work correctly so it is worth fleshing out what could be going on. Did you have any of your cable crossing or coiled up (USB cable, THC cable from VIM to enclosure, work lead and torch lead). Try to separate these cables.

I created an EMI issue simply walking over the USB cable (but I had been holding down the metal on the table with a crowbar and was carrying the crowbar as I moved away from the table).

2 Likes
4

If the IHS switch is triggering during a cut it can also cause the torch to raise up.

Torch raising is not only caused by EMI.

3 Likes
5

Thanks! I’m not sure but it seems to be working normal. I’m thinking it was the NC program compile was bad or something. I’ll check all the connections as well.

1 Like
6

Definitely true. My theory assumed the IHS was working correctly.

So to rule out the IHS as a problem, you would need to watch the FireControl screen when the torch is rising. If the IHS is turning green during the cutting operation, with THC turned off, then it is a mechanical problem with the IHS circuit.

FireControlScreenIHS
FireControlScreenIHS1019×637 151 KB

3 Likes
7

By the way, you may not be having an issue now but this unsupported portion of the torch cable assembly could be a problem.
image

Do you not have the torch wand that follows the torch?

image
image420×519 48.1 KB

3 Likes
8

Thanks for that. I do have the pole but I just have too much slack in the cable . I’ll tighten that up.