Cut Height Problem

[Patriot Steel]

Hi Guy's
I've been getting some bad and incomplete cuts lately Hypertherm 45 amp sync cartridge 3/16" plate 45 amps cut height didn't look right in my cut file i have it set at book settings .125 so with the plasma off I ran the program again and then stopped it and measured the height and it at .140 I use sheet Cam what am i missing did something change and how do i fix this.
Thanks Dean

[adbuch]

It sounds like you need to calibrate your Crossfire Pro THC so that your torch is zeroed to the material surface. If you set it to 0.125" in SheetCam and it is cutting at 0.140" - then either calibrate your THC or subtract the difference of 0.015" to the cut height value you input to SheetCam.
I would hope that the Langmuir manual for their THC would tell you how to calibrate it. My table is a Plasmacam, so I am not familiar with the Langmuir system.

Have you reached out to Langmuir tech support?

David

[weldguy]

Slop in the lifter among other things can cause the actual torch height to be different from what you set it to. AS David said most systems have a way to compensate for this, almost like backlash compensation on a lathe or mill. If there is no way to calibrate it then as David said just fudge the number in Sheetcam so you get the correct height.

[tcaudle]

That method of touch off does it use? Ohmic? Mechanical? you can get a variance between where the software thinks zero is and where the touch off (IHS) found it. Usually there is a way to put in an offset amount to compensate for that error
Instead of stopping in the cut, stop it right after it moves to cut height (.125) form pierce height ans see where it is then

Also if the THC is on it adjusts to voltage not the arc gap. So .140 over .125 may be a THC voltage setting you need to address. Usually each volt is about .005 " of vertical lift. Do to lower it to .125 under THC subtract 3 volts from the target voltage.

[adbuch]

Tom offers some great advise here! I will look forward to seeing if you can successfully resolve your problem.
David

[Phillipw]

Hey there guys!

First time posting to this forum. I look around here from time to time. Always nice to get different prospective and such.

I see this thread is a little old. No resolve reported and some questions asked that wasn't answered.

I have ran a langmuir table for a few years now. The cut height has been a ongoing issue.

The questions I seen asked that wasn't answered. The only way to compensate height is to adjust the cut height in your cam software. Langmuir uses a mechanical type of touch off.

My experience with this is I created a program that cycles the z axis to a cut height of 0.063 and doest fire the torch so it is easily measured. I had to program a 0.049 or use nominal voltage to get 0.063 cut height. With time I noticed a friend changed his computer and his cut quality deteriorated. He ran this program and found that he no longer needed to compensate the cut height. I eventually went to a mini PC dedicated to my machine. I found out the same thing was true for me.

I am not sure the voodoo behind all of the interference. It seems to me that the langmuir THC works better with certain computer configurations.

Hopefully this information may help someone.

[adbuch]

Hey there guys!

First time posting to this forum. I look around here from time to time. Always nice to get different prospective and such.

I see this thread is a little old. No resolve reported and some questions asked that wasn't answered.

I have ran a langmuir table for a few years now. The cut height has been a ongoing issue.

The questions I seen asked that wasn't answered. The only way to compensate height is to adjust the cut height in your cam software. Langmuir uses a mechanical type of touch off.

My experience with this is I created a program that cycles the z axis to a cut height of 0.063 and doest fire the torch so it is easily measured. I had to program a 0.049 or use nominal voltage to get 0.063 cut height. With time I noticed a friend changed his computer and his cut quality deteriorated. He ran this program and found that he no longer needed to compensate the cut height. I eventually went to a mini PC dedicated to my machine. I found out the same thing was true for me.

I am not sure the voodoo behind all of the interference. It seems to me that the langmuir THC works better with certain computer configurations.

Hopefully this information may help someone.

Phillip - thanks for the updated information. I expect that other Langmuir owners will find this useful.
David

[Phillipw]

You are welcome!

This is a topic that comes up frequently on the langmuir forum. I am actually surprised these questions get asked here.

[adbuch]

You are welcome!

This is a topic that comes up frequently on the langmuir forum. I am actually surprised these questions get asked here.