Z axis home and moving issue

tecno

G91 ; relative positioning
G1 H2 Z-5 F6000 - moves bed down

Phaedrux

H2 will force a move regardless of where it thinks the Z position is on the axis.

If Z-5 moves the bed down, you have either not followed the settings from my post, or the M569 for the Z axis needs to change the direction of rotation.

Perhaps post your current config.g and homeall.g so we can see what it is now.

tecno

@Phaedrux

homez.g homeall.g config.g

Phaedrux

You still need to add M569 P4 for the Z axis since you're using driver 4

; Drives
M569 P0 S1                                     				; physical drive 0 goes forwards using default driver timings
M569 P1 S1                                     				; physical drive 1 goes forwards using default driver timings
M569 P2 S1                                     				; physical drive 2 goes forwards using default driver timings
M569 P3 S1                                    				; physical drive 3 goes backwards using default driver timings
M584 X0 Y1 Z4 E2                               				; set drive mapping

Phaedrux

G1 H1 Z125 F360 ; move Z up stopping at the endstop

Your homing move must be negative if the endstop is at zmin.

Positive Z moves should move the bed down away from the nozzle. If that homing move is going to the endstop, you need to change the direction of rotation for driver 4.

M569 P4 S0

tecno

@Phaedrux

G1 H1 Z125 F360  moves bed up to endswitch with Z set to 0

+25 bed wants to move UP from home pos with M569 P4 S1
-25 nothing happens

M569 P4 S0 homeing goes wrong way = Z is movíng away from from endswitch

Phaedrux

@tecno said in Z axis home and moving issue:

M569 P4 S0 homeing goes wrong way = Z is movíng away from from endswitch

Your homing move MUST be negative.

G1 H1 Z-150 F360

tecno

@Phaedrux

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.3.15 on Sat Jan 07 2023 12:09:54 GMT+0100 (centraleuropeisk normaltid)
G91                   ; relative positioning
G1 H2 Z-5 F6000       ; lift Z relative to current position
G1 H1 X125 Y125 F8000 ; move quickly to X or Y endstop and stop there (first pass)
G1 H1 X125            ; home X axis
G1 H1 Y125            ; home Y axis
G1 X-5 Y-5 F6000      ; go back a few mm
G1 H1 X125 F360       ; move slowly to X axis endstop once more (second pass)
G1 H1 Y125            ; then move slowly to Y axis endstop
G1 H1 Z-150 F360       ; move Z up stopping at the endstop
G90                   ; absolute positioning

And bed moves DOWN

Phaedrux

@tecno said in Z axis home and moving issue:

And bed moves DOWN

With M569 P4 S0 or S1 ? Whichever it is, change it so that Z- moves make the bed go up.

tecno

@Phaedrux

THANK YOU !!!

Now it works OK

homez.g homey.g homex.g homeall.g config.g