Using Z stop for homing - help

My D-Bot core XY machine s progressing but I have an issue with setting Z0.

In my ormerod, that used dc42's sensor board I used the following:-

G91
G1 Z3 F200
G90
G1 X100 Y105 F12000
G30

In the coreXY the Z0 is at the top of bed travel and will be triggered by the end stop switch. How do I set this out in the homez file?

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appjaws - Core XYUV Duet Ethernet Duex5
firmware 3.1.1 Web Interface 3.1.1
Ormerod 1-converted to laser engraver, Duet wifi
OpenSCAD version 2020.07
slic3r-1.3.0, Simplify3D 4.1.2, Cura-4.4.1

set the z homming to the min endstop. When homming if the bed goes down instead of up, them simply modify your config file to change the z motor direction.

If you want to use a microswitch to home Z, you needs to do three things:

- Change the M574 command to specify that there is a homing switch for the Z axis, and whether it is high end or low end

- Change the M558 command to say that the Z probe is not used for homing the Z axis

- Change the homez.g file to look like the homex.g and homey.g files, but moving the Z motor instead of the X or Y motor

Or you could buy one of my mini differential IR sensors and use it to home Z (and for bed compensation if you want).

Edited 1 time(s). Last edit at 06/03/2016 09:03AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thanks dc42, I want to get the basic machine working properly and then refine it. one of the refinements will be your mini differential IR sensors

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appjaws - Core XYUV Duet Ethernet Duex5
firmware 3.1.1 Web Interface 3.1.1
Ormerod 1-converted to laser engraver, Duet wifi
OpenSCAD version 2020.07
slic3r-1.3.0, Simplify3D 4.1.2, Cura-4.4.1

I forgot to say, you will also need to change the Z homing section of homeall.g.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].