Homing issue with Dual endstop

[YYCSparks]

Hey guys,

I have a Dual end stop setup for my MPCNC and I think I have my config setup right to have the system auto square but I have an issue specifically on my X axis when it homes that sometimes one of the X rails does not travel all the way to the limit switch and the motor stalls.
My understanding and perhaps its wrong is that both of X motors should drive to the end stops and both stop once they reach the end stop.

Here is my config and a video of what happens:

Video:
https://youtu.be/F8xYpFpeYBk

Config:

; Configuration file for Duet 3 Mini 5+ (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Thu Mar 24 2022 08:01:33 GMT-0600 (Mountain Daylight Time)

; General preferences
M453                                            ; Set CNC Mode
M550 P"MPCNC01"                                 ; set printer name
G90                                             ; send absolute coordinates...
G21												; Set units to mm

; Network
M552 S1                                         ; enable network
M586 P0 S1                                      ; enable HTTP
M586 P1 S0                                      ; disable FTP
M586 P2 S1                                      ; enable Telnet

; Configure Drives
M669 K0                                         ; explicitly set Cartesian kinematics, even if I should not need to
M569 P0.0 S1                                    ; physical drive 0.0 goes forwards
M569 P0.1 S0                                    ; physical drive 0.1 goes forwards
M569 P0.2 S1                                    ; physical drive 0.2 goes forwards
M569 P0.3 S0                                    ; physical drive 0.3 goes forwards
M569 P0.4 S0                                    ; physical drive 0.4 goes forwards
M584 X0.0:0.1 Y0.2:0.3 Z0.4                     ; set drive mapping, dual X axis and dual Y axis

; Configure Axis
M92 X100.00 Y100.00 Z400.00				        ; set steps per mm
M350 X16 Y16 Z16 I1                             ; configure microstepping with interpolation
M566 X900.00 Y900.00 Z60.00				        ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 					; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00					    ; set accelerations (mm/s^2)
M906 X900 Y900 Z900 I70							; set motor currents (mA) and motor idle factor in per cent
M84 S240                                        ; Set idle timeout

; Configure Axis Limits
M208 X0 Y0 Z-92 S1								; set axis minima
M208 X636 Y501 Z92 S0							; set axis maxima

; Configure Endstops
M574 X1 S1 P"io5.in+io6.in"						; configure switch-type (e.g. microswitch) endstop for low end on X via pin io5.in and io6.in on X axis
M574 Y1 S1 P"io3.in+io4.in"						; configure switch-type (e.g. microswitch) endstop for low end on X via pin io3.in and io4.in on Y axis
M574 Z2 S1 P"io2.in"

; Configure Z-Probe
;M558 K1 P8 C"!io1.in" H5 F100 T3000 			; XYZ Workpeice probe connected to io1 input
M558 P5 C"!^io1.in" H5 F200:75 T6000            ; set Z probe type to switch and the dive height + speeds
G31 P850 X0 Y0 Z14.5                             ; set Z probe trigger value, offset and trigger height

; Configure Heaters
M140 H-1										; Disable heated bed
M564 S1 H1 										; Disable jog commands when not homed
M308 S2 Y"drivers" A"DRIVERS"              		; configure sensor 2 as temperature warning and overheat flags on the TMC2660 on Duet
M308 S3 Y"mcu-temp" A"MCU"                      ; configure sensor 3 as thermistor on pin e1temp for left stepper

; Configure Fans

; Configure Tools
M950 R0 C"out6" L10000							; Spindle 0 uses exp.heater1 as RPM pin and has a max RPM of 10000
M563 P0 S"Spindle 1" R0                         ; Define the router as tool 0

; Custom settings
;M575 P1 S1 B57600                              ; Enable PanelDUE
M911 S21.0 R23 P"G91 G1 Z3 F1000" 				; Configure power loss resume
M501											; Load Stored Parameters 
G54                                             ; Select Workspace Coordinate 1

[fcwilt]

@yycsparks

Is something preventing movement all the way to the end stop before the endstop is triggered?

There was a thump suggesting that.

Frederick

[YYCSparks]

@fcwilt hey thanks for the reply, so based on your thoughts you think its more mechanical than software based? I will go back over the rails tonight and see what I can find.

[fcwilt]

@yycsparks

I have a printer with dual Y steppers and dual Y endstops.

That same printer has triple Z steppers with triple Z endstops.

They all home smoothly with no "thumps".

Here is a quick-and-dirty video. I have purposely put the bed way out of level to demonstrate auto bed leveling.

Homing video

Frederick

[YYCSparks]

@fcwilt said in Homing issue with Dual endstop:

Here is a quick-and-dirty video. I have purposely put the bed way out of level to demonstrate auto bed level

Thank you for sharing the video that is really slick, and my config should result in the same result I assume?
I will check that the rails will allow for the required movement.

On a side note what printer is that?

[fcwilt]

@yycsparks said in Homing issue with Dual endstop:

Thank you for sharing the video that is really slick, and my config should result in the same result I assume?

Well if your printer has two Y steppers and three Z steppers you should see much that same.

On a side note what printer is that?

Something I designed myself. I was reading about different types of printers and was intrigued with the "MarkForged" kinematics. So I set out to build one. I also chose to try belt drive for the Z axis - very pleased with the result.

Frederick