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Torch height is off.. how to fix it?

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Pat4rd
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Joined: Thu Apr 06, 2017 6:32 pm

Torch height is off.. how to fix it?

Postby Pat4rd » Mon Jul 10, 2017 2:09 am

I've really been burning through some hypertherm consumables, went to check my torch height and it appears to be pretty high. I did this by turning the torch off, running a simple line file and sticking a .06" shim under it. There was a big gap between the torch and the shim. I went back to sheet cam, plugged in .008 and now I can fit my shim under it with no gap. What's the best way to correct this? I've got a proma thc 150, Mach 3, 45xp with a machine torch. I would rather fix this the right way instead of putting .008 in the computer.. Thanks for any help!

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Millermatic 252
Hypertherm 45xp machine torch
Eagle 4x4
Mach3, sheetcam, adobe il, inkscape
Proma 150 floating head, Quincy 5hp 60gal, 3 stage dryer.

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acourtjester
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Re: Torch height is off.. how to fix it?

Postby acourtjester » Mon Jul 10, 2017 8:46 am

Cleaning the nozzle first, are you using a floating head switch or a ohmic sensor to set Z zero for your pierce height?
DIY 4X4 Plasma/Router Table
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Simko
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Re: Torch height is off.. how to fix it?

Postby Simko » Mon Jul 10, 2017 9:13 am

Have you calibrated your z-axis steps? Pick a stationary point on the z-axis and a moveable point and measure between with calipers. Manually move the z-axis a known amount and re measure to verify it moved the distance you told it to move. If it is off, use the MACH procedure for calibrating steps per unit measurement.

If your steps are correct, then it has to be your switch offset that is wrong.
Steve

Homebrewed plasma table in the works, NSK linear rails, 3.2:1 belt reduction, CandCNC Plazpak 1A with DTHCIV Ethercut, Hypertherm 85, Linux CNC and SheetCAM
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tcaudle
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Re: Torch height is off.. how to fix it?

Postby tcaudle » Mon Jul 10, 2017 11:36 am

The THC has no idea where the Z DRO is nor does it care. It simply moves to make the arc volts correct. Assuming the THC is working it moves the Z to whatever height it takes to maintain the Arc Volts during the cut. In the conventional parallel port setup MACH takes the UP and DOWN is as a Z jog and simple moves the motor the distance to hold the volts and tracks how far that is. In short Height = Arc volts (all other things set according to the chart). The touch off needs to be accurate to get a correct pierce. Too low and you get blow back. Too high and you get upper slag or a bad pierce.

The PROMO is a very basic UP- Down sending unit and there is no communication between the THC and MACH or vice versa..

You Z can be out of calibration and the DRO will read different from the actual height but the actual gap is wat counts

Pat4rd
Posts: 68
Joined: Thu Apr 06, 2017 6:32 pm

Re: Torch height is off.. how to fix it?

Postby Pat4rd » Tue Jul 11, 2017 2:41 am

Thank you all! I will check that.. I'm just learning all of this new stuff.
Millermatic 252
Hypertherm 45xp machine torch
Eagle 4x4
Mach3, sheetcam, adobe il, inkscape
Proma 150 floating head, Quincy 5hp 60gal, 3 stage dryer.

bloftin
Posts: 5
Joined: Mon Aug 07, 2017 3:09 pm

Re: Torch height is off.. how to fix it?

Postby bloftin » Mon Aug 07, 2017 8:52 pm

This post was very beneficial to me thanks all that have contributed to it


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