Z axis cuts in the air - not plunging

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05 Sep 2020 18:33 #180832 by Mike_Eitel
How do you generate gcode. Which program do you use.?

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05 Sep 2020 18:40 #180833 by Jeff65
Thanks for your help anyway.
regards

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05 Sep 2020 18:42 #180834 by Jeff65
Code generator I use is JSCUT
It operates in the browser.

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05 Sep 2020 18:50 #180836 by Mike_Eitel
I had just a small look on that page.
Down below i think is the possibility to set your zero point.
The propose a simpel set 0 to low left corner. I think you used that and get "positive" oriented code. So generated your "problem".
Make the effort an place the origin to the top (left or right) corner. And you are done with yourrunning config.
Mike

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05 Sep 2020 18:55 - 05 Sep 2020 18:58 #180837 by Jeff65
OK - thanks for that

So I need to know if I should undo everything I've just tried to solve things.

I changed over 2 wires on the stepper motor.
I changed HOME_offset to -1 from -64
I corrected the spelling mistake which was obviously needed.

Before I did all that the motion of the Z axis was not matching what was on the screen - jogging up was displayed on linuxcnc as going down and vice versa

Everything seems to match now but i can't home the axis as it moves away from the switch
Last edit: 05 Sep 2020 18:58 by Jeff65.

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05 Sep 2020 19:08 #180840 by Mike_Eitel
Sorry i'm not aware of your actual status. But actually its not so complicated.
1. Make sure that your screen and your machine make the same moves.
2. If homing does not work : read this very good document
linuxcnc.org/docs/2.8/html/config/ini-homing.html
3. Adjust gcode

My personal taste is to stay in positive configuration numbers for scaling etc.. If motor turns wrong, i swap two wires. Negative values confuse sometimes when coming to homing..

For scut i propose you to fiddle around with that starting point.

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05 Sep 2020 19:10 #180841 by Mike_Eitel

Sorry i'm not aware of your actual status. But actually its not so complicated.
1. Make sure that your screen and your machine make the same moves.
Test in jogging modus. Give a midi g0 X0 and then g0 X1. See if itdoes what you expect. Repeat for Y and Z.
2. If homing does not work : read this very good document
linuxcnc.org/docs/2.8/html/config/ini-homing.html
3. Adjust gcode

My personal taste is to stay in positive configuration numbers for scaling etc.. If motor turns wrong, i swap two wires. Negative values confuse sometimes when coming to homing..

For scut i propose you to fiddle around with that starting point.

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05 Sep 2020 19:13 #180843 by Jeff65
OK thanks for your help.
One last question -
So its best for a Z axis to be positive as its raising or positive as its descending?

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05 Sep 2020 19:30 #180846 by Clive S

OK thanks for your help.
One last question -
So its best for a Z axis to be positive as its raising or positive as its descending?


Are you in the UK by any chance?

For a milling machine it is general for the z axis to move down going negative so 0 is at the top

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05 Sep 2020 20:19 #180847 by Jeff65
In the uk I am indeed.

Ok thanks for that clarification

I will do some more tweeks on the CNC tomorrow - and see if I can finalise things

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