M98 not working as described or user error

jsinicro

Hi,

Continuing on my learning, I've decided to use the concept of splitting and rejoining axis during homing I've customized my homingall.g to use the M98 command and call each individual axis to be homed nothing different on the X, and U axis these use endstops. However the Z axis seem to work a bit different with the bltouches. I have 2 tools one on the X axis and one on the U axis each tool has an associated bltouch. This is the original M584 cmd.

M584 R0 S0 X1.0 U3.0 Y0.2:0.3 Z0.0:0.5:1:0.4 E1.1:3.1 P4

this is the home all file:

; homeall.g
; called to home all axes
;
 M98 P"homex.g"
 M98 P"homey.g"
 M98 P"homeu.g"
 M98 P"homez.g"
 M98 P"homev.g"
 
M18 Z                           ; disable Z motors before reassigning them
M584 Z0.0:0.5:0.1:0.4 ; join both Z together
M350 Z16 I1                     ; Z reassign microstepping
M906 Z800 I30                   ; Z reassing currents (mA) and motor idle factor in per cent

G90

Homex, homey, homeu, homez and homev they all do as commanded, however after homingv it repeats homingz and never comes back to rejoing the Z motor mappings as defined in the homeall file. Not sure why this doesn't work.

this is the homingv file:

; homev.g
; called to home the Z axis
;
G91
M18 Z                           ; disable Z motors before reassigning them
M584 Z0.1:0.4                   ; Split the 2 Z towers for independent control. this will move right tower only
M350 Z16 I1                     ; Z reassign microstepping
M906 Z800 I30                   ; Z reassing currents (mA) and motor idle factor in per cent
;T0 P0                        ; Select Tool 1 and run tfree0 only to park T0
G1 H1 X250 Y250 Z5 F6000    ; lift Z relative to current position
G30 K0                       ; this will home and probe the left Z tower

and this is the homingz file:

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Sun Apr 18 2021 23:08:10 GMT-0400 (Eastern Daylight Time)

; Back to absolute positioning
M18 Z   ; disable Z motors before reassigning them
G91
;G92 Z0 ; Momentarily set Z to 0 position so tool change can be executed

M584 Z0.0:0.5               ; Split the 2 Z towers for independent control. this will move left tower only
M350 Z16 I1                 ; Z reassign microstepping
M906 Z800 I30               ; Z reassing currents (mA) and motor idle factor in per cent
;T1 P1                       ; Select Tool 0 without running tfree tpre tpost
G1 H1 U250 Y250 Z5 F6000    ; lift Z relative to current position
G30 K1                      ; this will home and probe the left Z tower

G90

Why does it call homingz twice, because I think the homeall gets executed completely, but the second call to homez leaves the Z axis unjoined.

jsinicro

@jsinicro Wow, It helped me type this, the error is in the config.g file in the

M584 R0 S0 X1.0 U3.0 Y0.2:0.3 Z0.0:0.5:1:0.4 E1.1:3.1 P4

the Z part should be Z0.0:0.5:0.1:0.4 , however the above should work as Z1:0.4 is the same as Z0.1:0.4 so I guess this is not it, but I will fix it and see if it makes any difference.

Phaedrux

@jsinicro said in M98 not working as described or user error:

                                                                                                                                                                        M18 Z                           ; disable Z motors before reassigning them

As soon as you disable a motor, it becomes unhomed. In homeall.z if it reaches the end of the file and an axis isn't yet homed it will call the associated homeing files for that axis. So you home everything, disable the Z motors and unhome Z, so it then tries to homez again for you.

There's no need to disable the motors with M18.

dc42

@jsinicro which RRF version are you using, and what are you trying to achieve splitting the Z axis?

jsinicro

@dc42 OK, I saw this in the Zidex config or homing files. as a way to switch axis and probably it would be used to print with 2 different filament on 2 separate axis. Yes what Phaedrux said makes sense that's probably why it calls the homez twice. Basically doing this it gets both Z towers homed using the bltouch on each tool carriage, thus switching Z axis from tower 1 to tower 2. I've been trying to use the 38.2 command to run homing on the second Z axis called V however even if the bltouch deploys and retracts once it hits the workpeace and the axis stops moving I still get an error message of homing failed. I've upgraded everything including the touch screen and boards to RRF3.3RC2 I have not tried doing any prints yet as I am still waiting for the heated bed silicon to arrive, however both extruders work filament flows pretty good, just have to tweak the flow rates motors steps and the next thing to work on is the bed leveling, one for each tool thus I should be able to switch between the two towers.

Phaedrux

Could you show some photos of the printer to show how it's laid out? It's a little confusing to understand.