Offset after G53 X0 ang G92 X0 ?

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21 Feb 2011 16:06 #7349 by nursum
Hi,

I have the following problem with my maschining centre: I home all axis X,Y,Z and A, then for sure I go with G00 G53 to X0 Y0 Z0 and A0 after that I set with G92 all axes to zero but in the display always is X= 0.025 Y=0.027 Z=-0.043 and A= 359.995. I tried out several things like setting all values in the .var file to zero and many other things (like driving a small way with the axes at the homing). The behavior of the machine is like there is an offset in the G53 values! When I program for example G00 X20 the machine goes to X20.025. Everything works well but the display shows me a litte added offset.

How can I solve this foult?

Ingo

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21 Feb 2011 16:30 #7350 by BigJohnT
By removing the offset you have in the G54 coordinate system which I assume your in. In View check machine position to see the G53 position.

A short read on this is here:

www.linuxcnc.org/docview/html/common_User_Concepts.html#r1_5_3

John

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21 Feb 2011 16:51 #7351 by nursum
Hi John,
that is the problem, I tried to explain, I have already made the procedure with G53, then elect G54, then clear any offset with G92.1 ... and so on! But after that my display shows me X0.025 y 0.027..... there is an offset only shown in the display! When I program G01 X100 Y20 the machine goes to X100.025 Y20.027. For the accurancy it doesent matter because when I define my zero point it has also the offset! But the display shows the wrong value..

Ingo

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21 Feb 2011 18:36 #7355 by BigJohnT
G92.1 does not clear all offsets only the G92 offsets.

John

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21 Feb 2011 20:20 #7358 by nursum
I deleted also all values in the .var file! I can't find any value with that little offset, and normally when I program G92 X0 for example the value which should be shown is 0 but in my case it is shown 0.025 ...
It really seems that the display or the internal zero has a little offset, maybe there is a problem while homing...

Ingo

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21 Feb 2011 21:39 #7360 by BigJohnT
Did you try the things in the link I gave you earlier?

John

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22 Feb 2011 07:35 #7366 by nursum
Yes shure! I made that also before I opened a new thread but I tried it again.

Ingo

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22 Feb 2011 10:54 #7369 by BigJohnT
If your not using any pci hardware like a Mesa can you zip or tar up your config files and attach them to the reply. I'll run them here and try and reproduce your symptoms.

John

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22 Feb 2011 20:40 #7389 by nursum
Hi John, I'am using a mesa cards, exacly a lot of them because I have six axis an about one hundred digital inputs and fifty digital outputs....

Ingo

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22 Feb 2011 21:04 #7390 by BigJohnT
Just another thought in the View menu are you looking at commanded position or actual position?

John

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