SZP in touch mode

CaiJonas

@gloomyandy

Thank you very much for your help.

Unfortunately I cannot open the link. Could you please share again?

Best Regards,
Cai

jay_s_uk

@CaiJonas you may need to join our discord channel before being able to open the link
https://discord.gg/uS97Qs7

CaiJonas

@jay_s_uk great now it works. thank you very much

dc42

@CaiJonas 2mm sounds like a very small window, I would expect more. I presume you have tried using different drive levels (M558.2). If you set the minimum drive level that doesn't give a 999999 reading with the nozzle touching the bed, how high can you raise the nozzle before you get a 999999 reading?

The RC1+2 firmware at https://www.dropbox.com/scl/fo/y03luwmbypirbxncla3rk/AAJFLPFsVdFylemyhkXsAac?rlkey=7cq4svp4rzl2ztdffpzq2ghjk&dl=0 may provide a larger window than RC1 does.

CaiJonas

@dc42 this firmware is not making a difference.

May I ask some general question.

I calibrated the szp when the printer was preheated, otherwise it will not work
for what do I have to calibrate the probe: M558.1 K0. Is this needed before calbritating z = 0 with this command: G30 K0 S-2 Z-99999 ?
is there aother explanation for triggert hight and offset?

Best Regards
Cai

dc42

@CaiJonas the M558.1 calibration is needed (a) to set up the probe for use in scanning mode, and (b) to calibrate the trigger height and value if you execute a G30 command using the probe without putting it in touch mode. The calibration is not used when executing G30 in touch mode.

CaiJonas

@dc42
thanks for the fast answer. As I understood now, M558.1 calibration is needed if I would home z with the SZP and it is needed for the scanning.

I have an end switch at z limit to home and I use SZP in touch mode for z = 0 adjust.

I have played today after going back to 3.6.0 Release Candidate 1.

I recalibrate and have now M558.2 K0 S16 R133143.

Now I have a much bigger reading window/corridore. I don't know why not before.

In addition to that I do not need any more the turn around to adjust Z = 0.

My files now look like that:

; bed.g
T0                              ; se3lect tool1
M561 							; clear any bed transform
G90								; absolute postioning
G28                             ; home
G1 X60 Y5 Z3 F20000 			;
M558.3 K0 S1 V0.6 F100        	;
G30 K0 S-2 Z-99999              ;
M558.3 K0 S0                	;
G91								; absoluterelative postioning
G1 Z0.00                        ;
G92 Z0                          ;
G90								; absolute postioning
G29								; probe the bed and enable compensation

; mesh.g
T0                              ;
G90								; absolute postioning
G29 S2                          ; clear hight map
M557 X20:100 Y20:100 P10        ; Define grid for mesh bed compensation, origin in bed centre
G31 K0 Z2 Y15.5			    ; define probe 1 offsets and trigger height
M558.1 K0 S0.3                  ; Calibrate probe
G1 Z5                           ; Move up at end of calibration
G29 S0 K0                       ; Scan bed and create mesh

If needed where can I adjust the z offset after probing in touch mode?

best regards
Cai

dc42

@CaiJonas said in SZP in touch mode:

If needed where can I adjust the z offset after probing in touch mode?

M558.3 H parameter.

CaiJonas

@dc42

it's getting clearer. Thanks alot.

in which order do I have to put it

a)
M558.3 K0 S1 V0.6 F100 HXXX
G30 K0 S-2 Z-99999

or

b)
M558.3 K0 S1 V0.6 F100
G30 K0 S-2 Z-99999
M558.3 HXXX

and what about the S parameter in G30, do I need S-3 or S-2?

Best Regards
Cai

dc42

@CaiJonas both (a) and (b) will work. If you are using G30 to set Z=0 then don't use S-2 or S-3 in the G30 command. See https://docs.duet3d.com/en/User_manual/Reference/Gcodes#description-3.