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For the other discussion it boils down to me realizing that I don't measure 0 to 200 Volts, but instead 0 to -200 Volts.
It works because it is truly floating, but it's not desirable the way I made it.
A quick test made me realize I am not an electronics engineer, but I'll get there. It will be put on the slow burner. I mean it works as is and it works good.

As for the grounding, it works fine so no change needed. All signals are by designed isolated, no ground loops I can think of. But if any noise problem develops, I know what you all do.

yea i have thanks but now have to clean up my ini dos corruptions i did not realise that notepad from wine was used to open my ini file.
Just up graded from 18.04 to 20.04 Ubuntu hoping to get better speed from my machine and it has become a bit of s doze machine.

Hi,

Precision of the entire machine and resolution of commands are two very very different things.

The setup and build of the machine itself are not the topic of this discussion. Please keep it that way.

PLEASE stay on topic.

Thank you

Back to the centre home position, you touch off using G54 offsets to achieve this in the work piece
linuxcnc.org/docs/2.4/html/gcode_coordinates.html
Here is an example part where you would touch off on the centre of the part as everything needs to be concentric of the centre bore.
 
This does not affect the machine home position
 

@phillc54 What's the boiled down theory of that? Disconnect electrode lead and a new voltage sensor path?
Edit: looked again, no its not that. I don't get it.

Can someone point me to the documentation on how to setup/use "Opt Block" and "Opt Stop" in QtDragon?

I tried putting a slash at the beginning of a block of code, and all the combinations of Opt Block on/off and Opt Stop on/off before clicking "Cycle Stop," but I couldn't see any change in behavior.

Also, I noticed that I can't turn them on or off while in Auto Mode, but that seems like it should be the mode I would want to do that in. ??

I searched for "Opt Block" and "Opt Stop" on the following two pages:
linuxcnc.org/docs/html/gui/qtdragon.html 
linuxcnc.org/docs/html/gui/qtvcp.html
and generally in google, but couldn't find any love.

Are there .hal pins?

This is not a priority, but I'm curious.

Thanks!

tommylight wrote:

It is not possible to use the same pin for tandem axis homing, but you can use one pin for home_all and the second for home Y2 as in the attached example from a working machine.

Also note how Tommy has used HOME_SEQUENCE to home the Z axis first.

This approach from Toast is also worth considering. As used by Swift Cut commercially (And also by Les from Sheetcam)