Struggling with the z-axis

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martinwh99
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16 Nov 2013 03:31 #40843 by martinwh99

Struggling with the z-axis was created by martinwh99

Hello

I just got my cnc mill ready and the axix are running. But i do have problem with the z axis. I have the following defined in Steppconf.

x form 0 to 540
y from 0 to 940
z from -110 to 0

and my 0,0,0 is in the left upper corner.

so fare i read and understood what is written in the wicki. although i do not understand why the z axis must be defined like that.

when i try to run the linuxcnc example it tells my that the z-axis is out of limit.

in linux.ini i have set the following values

5221 0.00000
5222 0.00000
5223 -110.00000

When starting my machine is on 0,0,0 than i do the reference and set home to the axis.

But the error i get is that my z axis is out of the lower limit.

can someone please help me, thank's

regards
Martin

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andypugh
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16 Nov 2013 07:18 #40847 by andypugh

Replied by andypugh on topic Struggling with the z-axis

martinwh99 wrote:
when i try to run the linuxcnc example it tells my that the z-axis is out of limit.

You probably need to "touch off" the Z-axis. This means telling the system what you want to call the current position.

The sample files are set up with Z=0 at the surface of the work, then the rapid moves are clear of the work at + something, and the cuts are to - something.

In the non-offset machine coordinates, anything +Z is out of bounds. This is perfectly normal, you pretty much _never_ work in machine reference coordinates.

So you need to jog to somewhere inside the machine limits, and say _this_ is where I want Z=0 to be.

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