Sensorless homing

chris

homeall.g

M98 Phomex.g
M98 Phomey.g
M98 Phomez.g

homey.g

M400 ; wait til stuff stops
M574 X1 Y1 S3 ; use stall guard for endstops
M913 X30 Y30 ; drop motor currents to 30%
M201 X1000 Y1000 ; reduce acceleration on X/Y to stop false triggers
M915 P0:1 S3 R0 F0 H400; both motors because corexy; Sensitivity 4, don’t take action, don’t filter, 400steps/sec
G91 ; set relative
G1 Z5 F1200 S2
G1 S2 Y-350 F4000 ; move forward 250mm, stopping at the endstop
G1 Y10 F1200; move away from end
G1 Z-5 F1200 S2
G90 ; back to absolute positioning
M400 ; wait again
M913 X100 Y100 ; motor currents back to 100%
M201 X3000 Y3000 ; accel back to original
M574 X1 Y1 Z0 S0 ; set endstops back

chris

This post is deleted!

chris

video of motor issue

oliof

increase sensitivity until you get wrong readings from the motor starting, then slowly reduce it again.

chris

cheers i am guessing the sensitivity is this line...

M915 P0:1 S3 R0 F0 H400;

chris

M915 P0:1 S-5 R0 F0 H400;

even with s-5 motor keeps trying and not triggering

baird1fa

I do believe you can go all the way to -63. Speed, and motor current are also a factor when using the stall detection. it took me quite a bit to find the sweet spot where the stall detection wouldn't detect the ball screw but would detect it hitting the nozzle. I have also read that it works better at higher speeds but lower current settings. Best of luck.

baird1fa

The issue you might be having is that you are moving quite slowly at 1200mm/min compared to the number of steps you have set to be reliable. I think many corexy system will move 20mm in 1 full rotation of the motor which would be 400 steps with a 0.9degree motor so that might be your issue. Try lowering that number of steps its your H value in the M915. also try moving faster.

chris

sorry is a Cartesian cr-10 belt driven

Phaedrux

IF sensitivity still isn't getting you to stall detect, decrease current and increase speed.

Also review your H value in M915 as @baird1fa has said. Default values aren't going to work most likely, you will need to tune it.

https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing