Mesh Grid Compensation Trial

[zerspaner_gerd]

Hi Guys,

I wanted to test the mesh grid compound before I buy / install a sensor.

I thought I'd take a Dial Test to drive off the platform (something like this), but I get such results.

The difference between Nozzle and Dial Test is 7.38mm in Z.
I have already tried the following variants:

G31 P-7.38 X14 Y-15 Z-7.38
G31 P7.38 X14 Y-15 Z7.38
G31 P-7.38 X14 Y-15 Z7.38
G31 P7.38 X14 Y-15 Z-7.38
G31 P-7.38 X14 Y-15 Z7.38

Do I do something wrong or does not work if you do not have an active Z-probe?

greetings

[dc42]

To generate a height map without using a Z probe, set probe type P0 in the M558 command. Then set up a mesh using M557, run G29 as normal, and follow the prompts in DWC or on PanelDue (this needs fairly recent PanelDue firmware to work).

[zerspaner_gerd]

@dc42

I did it all so, but I could not adjust the Z offset properly.

Whether negative or positive with G31

[dc42]

@zerspaner_gerd said in Mesh Grid Compensation Trial:

@dc42

I did it all so, but I could not adjust the Z offset properly.

Whether negative or positive with G31

G31 sets the trigger height of the Z probe. So if you generate a height map without using a Z probe, G31 does nothing. The Z offset that you get when you generate a height map without a Z probe is the error in your Z=0 position after Z homing. So you should adjust your Z homing position.

[zerspaner_gerd]

@dc42
This distance, where marked in the picture.

Where do I enter this best.

[dc42]

Are you using that device as a Z probe, or are you setting Z probe type 0 and jogging the head down until you get a certain reading on that device?

[zerspaner_gerd]

@dc42 said in Mesh Grid Compensation Trial:

are you setting Z probe type 0 and jogging the head down until you get a certain reading on that device?

Correct Z probe type is 0,
and I move manually through the menu until the pointer is at 0.

[dc42]

The probeless probing code assumes that you are going to drop the nozzle until it touches the bed. What might work is to select tool 0, use G10 to temporarily set a tool Z offset of that height, then run the procedure, then set the offset back to zero.