Z Axis home speed varies.

Karim

Hey guys I notice my Z axis when homing, the speed varies sometimes it normal speed and sometimes it's very slow. Another thing when I hit the emergency stop it look like the Z homing is speed ok.

; Z probes
M558 P5 C"^zprobe.in" H5 F300 T6000            ; set Z probe type to switch and the dive height + speeds
G31 P500 X0 Y0 Z.74                       ; set Z probe trigger value, offset and trigger height
M557 X0:282 Y0:275 S40                        ; define mesh grid

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.3.14 on Sat Oct 29 2022 11:08:05 GMT-0400 (Eastern Daylight Time)
G1 X140 Y150 F6000  ; go Center of bed
G91                ; relative positioning
G1 H2 Z5 F6000     ; lift Z relative to current position
G90                ; absolute positioning
G1 X140 Y150 F6000 ; go to first probe point
G30                ; home Z by probing the bed

Phaedrux

Is it always only homez that you are calling? Are there any other macros in between that could be altering the speed of the probe dive, (m558 F) or the speed limit of the Z axis itself?

Karim

@Phaedrux No I don't have any macros, only bed.g have the 558 but that's after home z.

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.3.14 on Sat Oct 29 2022 11:08:05 GMT-0400 (Eastern Daylight Time)
G1 X140 Y150 F6000  ; go Center of bed
G91                ; relative positioning
G1 H2 Z5 F6000     ; lift Z relative to current position
G90                ; absolute positioning
G1 X140 Y150 F6000 ; go to first probe point
G30                ; home Z by probing the bed

; bed.g
; Called to align the gantry to the bed plane via G32
  
M561                    ; Clear any bed transform
M84 E0                  ; Turn off noisy Extruder motor
;G28                     ; Home all axes

; Probe the bed at 4 points, x3 for more precision
M558 K0 H10 F1200                ; increase the depth range, gets the gantry mostly level immediately
M98 P"/sys/bed_probe_points.g"
M558 K0 H4 F240                  ; reduce depth range, probe slower for better repeatability
M98 P"/sys/bed_probe_points.g"
M558 K0 H1 F60                   ; reduce depth range, probe slower for better repeatability
M98 P"/sys/bed_probe_points.g"


G90                     ; absolute positioning
G1 X140 Y150 F6000      ; go Center of bed
G30                     ; home Z by probing the bed
G1 F9000 X140 Y150 Z150

dc42

@Karim if you home Z after you have already run G32 then the Z homing speed will be 60mm/min because that was set in line 13 of bed.g.

To avoid this, use M558 in homez.g to reset the probing speed before the G30 command.

Karim

@dc42 ok like this

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.3.14 on Sat Oct 29 2022 11:08:05 GMT-0400 (Eastern Daylight Time)
G1 X140 Y150 F6000  ; go Center of bed
G91                ; relative positioning
G1 H2 Z5 F6000     ; lift Z relative to current position
G90                ; absolute positioning
G1 X140 Y150 F6000 ; go to first probe point
G30                ; home Z by probing the bed

M558 P5 C"^zprobe.in" H5 F300 T6000            ; set Z probe type to switch and the dive height + speeds

Phaedrux

Don't use the full line, just M558 F300. If you use the full line things can get reset in G31.

Karim

@Phaedrux said in Z Axis home speed varies.:

M558 F300

This does not work. The only way it goes to normal speed (F300) is by emergency stop or power off then power on.

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.3.14 on Sat Oct 29 2022 11:08:05 GMT-0400 (Eastern Daylight Time)
G1 X140 Y150 F6000  ; go Center of bed
G91                ; relative positioning
G1 H2 Z5 F6000     ; lift Z relative to current position
G90                ; absolute positioning
G1 X140 Y150 F6000 ; go to first probe point
G30                ; home Z by probing the bed
M558 F300          ; Reset Probe Speed.

infiniteloop

@Karim said in Z Axis home speed varies.:

This does not work.

I bet against: just home Z twice - the second time, it should run at normal speed.

I think you should move the line

M558 F300          ; Reset Probe Speed.

from the very end of home.g to its beginning - else, the intended speed change can't affect the G30 in the line above …

Karim

@infiniteloop Still does not work.

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.3.14 on Sat Oct 29 2022 11:08:05 GMT-0400 (Eastern Daylight Time)
M558 F300          ; Reset Probe Speed.
G1 X140 Y150 F6000  ; go Center of bed
G91                ; relative positioning
G1 H2 Z5 F6000     ; lift Z relative to current position
G90                ; absolute positioning
G1 X140 Y150 F6000 ; go to first probe point
G30                ; home Z by probing the bed

infiniteloop

@Karim said in Z Axis home speed varies.:

Still does not work.

Bet lost … So, I have no clue …

Karim

@infiniteloop , ok I think I got it, It's working now, I add the M558 F300 after G32 in the homeall.g

infiniteloop

@Karim said in Z Axis home speed varies.:

It's working now

Glad to hear that

Karim

Thanks guys.