LCD Set to Origin

Cyber_One

Hello,

Running RAMPS1.4 with RepRap Discount Full Graphic display.

System is currently configured in CNC Milling Mode on a home built unit running 0.92.8

this may seem like a silly question, 

but,

When navigating the quick settings menu, there is a function "Set to Origin"

What does this do?

The position indicators do not change.

G-code commands still go to the same positions after Set to Origin and they do after Home All in the position menu.

The vales in the set printer offset do not appear to change either?

So what does it do?

Repetier

That function executes G92 X0 Y0 Z0.

Coordinates you see are global coordinates and not the mapped one in shifted coordinate system. So Gx moves use new system/origin but shown coordinates are global.

Cyber_One

May be a bug somewhere,

When running from an SD Card, the Set to Origin doesn't change the print off set at all.

The G-code was created the easel program on the inventables site and references the work material as Z=0 on the top.

Engraving is then done into the Z=-x range depending on how deep it has to engrave.

If I set to origin with the z axis at 100mm from the bed then execute the code, the z axis move down to the 0 end stop where the stepper stops (the Z in limit is enabled) but the display shows the negative positions.

Here is the first few lines of the G-Code:

G21

G90

G1 Z3.810 F228.6

M3 S14000

G0 X21.034 Y36.741

G1 Z-1.587 F228.6

G1 X21.034 Y36.741 F1016.0

G1 X22.023 Y36.792 F1016.0

G1 X22.978 Y36.934 F1016.0

G1 X24.111 Y37.232 F1016.0

I'm still building this so haven't damaged anything yet, not from lake of trying ;-)

FYI the work area available is 750mm x 750mm x 300mm

All axis have both max and min limits and these have been tested.

Next major challenge is setting up a Z-probe, should be fun, then I mount a router to the head :-)