Trigger Height and a lot of confusions

[Niels]

@phaedrux should it be stopped @ 0?

[Phaedrux]

Well not necessarily. It should stop at the trigger height.

For nozzle contact probes that would be at 0 or slightly negative as it presses into the bed a bit. For proves that have a switch of some kind mounted above and to the side of the nozzle it would be some positive value.

[Niels]

@phaedrux BUT when i drive to z=0 after g32 i should above the bed?
That isnt working
It drives IN the bed

[Niels]

state: 

M665 R225.5 L450 B185 H410.500	

M558 P8 R0.4 H5 F1200 T6000
G31 P100 X0 Y0 Z0  

Nozzle 210° 
Bed 60°

• Make sure the dynamic test is successful (Z probe stops when it senses the bed) before doing this.
  -> Done. works. Bed stopped after g30

• Use the X and Y jog buttons to position the nozzle over the centre of the bed
  -> Done x0 Y0

• Jog the nozzle down until it is just touching the bed or just gripping a sheet of paper. If the firmware doesn't let you jog it down far enough, send M564 S0 to disable axis limits.
  -> paper scratched @ Z 1.84

• Once you have the nozzle touching the bed, send command G92 Z0 to tell the firmware that the head is at Z=0
  -> Done ... Z=0

• Jog the head up by 5 to 10mm
  -> Done M120
  G91
  G1 Z5 F6000
  M121

• Send command G30 S-1. The nozzle will descend or the bed rise until the probe triggers and the Z height at which the probe stopped will be reported.
  -> G30 S-1
  Stopped at height -0.029 mm
  Z=-0.03

• Repeat from step 5 two or three times to make sure that the trigger height is consistent.
  -> -0.022 -0.029 -0.022 -0.029

• In Duet Web Control, go to Settings -> System Editor and edit the config.g file. Set the Z parameter in the G31 command to the trigger height that was reported. Save the file.
  -> G31 P100 X0 Y0 Z-0.025
  saved

• Open config-override.g and check that there are no G31 commands in it. If you find any, delete those lines and save the file.
  -> done . Only PID tuning Stuff in the override

• To apply the new trigger height, restart the Duet by sending M999 or pressing Emergency Stop.
  -> Restarted

After All:

• G32 (look at pastebin)

• After that it stops at Z=5

• when i drive to Z=0 or start the print ---- the nozzle crashes in the bed.

G30 S-1 Stopped at height 0.797 mm

So annoying ... whats my mistake?

[Niels]

After all:
When i do a G30 i got the correct height ....
Why does the g32 (bed.g) does not this?

[Niels]

i realized that there are not compensation in use.... this is exactly what the g32 should to right?

[Phaedrux]

@niels g32 will only run the commands in bed.g

Do enable the compensation there must be a g29 S1 at some point to load the saved heightmap or G29 to run a probing cycle.

Usually best put in the slicer start gcode. Or at the end of bed.g which ever makes best sense.

[Niels]

Yes. i know ..

in my bed.g i do alot of g30 and the last one with s6.

--> fail

when i do a single s30.. it sets the height correctly....

this is what i didnt understand

[Niels]

[Phaedrux]

Being that this is on a delta all I can recommend is to recheck your calibration routine. Not my area of expertise unfortunately.

[dc42]

Try running G32 twice after power up before you drive to Z=0. If the M665 parameters in config.g are a long way from the true values, then there can still be a height error after running G32 once. This is especially true in firmware 2.03, and there will be a 2.03.1 release to fix this.