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Z-axis tricks

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orrs.welding.inc
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Joined: Sat Oct 06, 2018 10:06 am

Z-axis tricks

Postby orrs.welding.inc » Sat Oct 06, 2018 10:23 am

Hello group! New member but long time reader over last several years as I built my first candcnc based table with great success! Decided to try a new build with the gecko540 and different table design. I have my programs all working and calibrated (inkscape, sheetcam and mach3). I can import my test drawing of a 2 inch circle into Mach3, zero my x,y and z.. hit cycle start and it moves to start the cut & the z comes down. However, as soon as the torch is approximately 1 inch from my steel it changes direction and the z axis begins to go back up without touching off? I'm sure it's a simple setting in my software. Any insight would be awesome as I feel like I could be cutting again in no time! :)

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acourtjester
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Re: Z-axis tricks

Postby acourtjester » Mon Oct 08, 2018 10:32 am

I think there is a value in the Z command that limits the amount of travel down that is not enough and that is why this is happening. I think you hit the limit before the metal, one thing to change is the height of the torch at the start of the down movement in the g-code and the rapid clearance in SheetCam Job option I use 1". Plunge safety clearance may also have an effect.
DIY 4X4 Plasma/Router Table
CandCNC DTHC-IV & Feather Touch
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orrs.welding.inc
Posts: 3
Joined: Sat Oct 06, 2018 10:06 am

Re: Z-axis tricks

Postby orrs.welding.inc » Mon Oct 08, 2018 6:04 pm

Ok I'll check into that right now thanks!

orrs.welding.inc
Posts: 3
Joined: Sat Oct 06, 2018 10:06 am

Re: Z-axis tricks

Postby orrs.welding.inc » Tue Oct 09, 2018 9:14 am

I worked at adjusting the values in sheetcams
Job options and still continues to do the same movements. It will go to touch down, almost touch down and then retracts before the z micro switch hits

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acourtjester
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Re: Z-axis tricks

Postby acourtjester » Tue Oct 09, 2018 11:22 am

You can look at these 2 areas and see what the value is for the Z down movement. One is in the Post processor and the other is in a tap file, try editing your g-code (tap file) to find a value that works and then edit it in the post processor so it will be all of the new g-codes you plan.
Now if you are using a floating head switch the command may be a G28 and for a ohmic sensor it may be a G31 (probe being used).
Now at the start of an operation I always zero all the axis and then out the DROs for the X, Y, and Z, if Z is not zeroed and is to high that may cause your problem.
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DIY 4X4 Plasma/Router Table
CandCNC DTHC-IV & Feather Touch
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PM 256 tig


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