BL Touch probe input not working
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home.g
G91
G1 Z5 F800 S2
M401
G90
G1 X120 Y125 F2400
G30
M402
G1 Z2 F200 -
Your M558 command should look something like this to get decent repeatability out of the BLTouch.
[c]M558 P9 X0 Y0 Z1 H5 F100 T4000 A10 R0.5 S0.008 ; P9 for BLTouch, dive height 5mm, probe at 100mm/s, travel 4000mm/s, probe until 2 consecutive probe results are to within S up to 10 probes, pause 0.5s, Reprobe until 0.008 repeatability[/c]
Here's what I'm using for HomeZ on my CoreXY.
[c]
; homez.g
; called to home the Z axis
;; BLTouch prep so we don't catch the probe pin on the edge of the bed
;
M280 P3 S160 I1 ; Alarm Release and Push-Pin UP just in case it's in alarm and deployed
G4 S1
M402 ; Retract probe just in case it's down
G4 S0.5; Drop the bed for travel
;
G91 ; Relative positioning
G1 Z5 F200 S2 ; Lower bed 5mm to ensure it is below the switch trigger height; Move probe into position
;
G90 ; absolute positioning
G1 X200 Y140 F4000 ; Move x and Y axis over to bed center so probe is on top of bed; Set lower speeds for homing
M566 Z10 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z400 ; Set maximum speeds (mm/min)
M201 Z100 ; Set maximum accelerations (mm/s^2); Probe the bed
;
M558 A1 F400 ; Set single probing at faster feed rate
G30 ; Do a single probe to home our Z axis
M558 A10 F100 ; Set more accurate probing at slower feed rate
G30 ; Probe again to get a more accurate position; Set normal speeds again
M566 Z15 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z500 ; Set maximum speeds (mm/min)
M201 Z300 ; Set maximum accelerations (mm/s^2); Move X and Y back Home
;
G1 X0 Y285[/c]I also use this as a macro to calibrate the probe trigger height
[c]; Clear compensation map and Zprobe trigger height
;
M291 P"Grid bed compensation map and ZProbe trigger height will be cleared. Ok or Cancel?" R"WARNING" S3 ; User must click OK or cancel.
M561 ; Disable any current bed compensation
G29 S2 ; Clear mesh bed compensation perameters
G31 Z0 ; Reset zprobe trigger height; home all axis
;
G28 ; Home all axis
G90 ; Absolute positioning
T0 ; Activate first tool; Set lower speeds for Z homing and lower Z motor current
;
M566 Z10 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z400 ; Set maximum speeds (mm/min)
M201 Z100 ; Set maximum accelerations (mm/s^2)
M906 Z900 ; Drop motor current to prevent damage in case of head crash; Preheat to probing temps
;
M291 P"Preheating to bed to 60 and nozzle to 210 for accurate probing"
M104 S210 ; Set nozzle to 210 and release
M190 S60 ; Set bed to 60 and wait
M109 S210 ; Set nozzle to 210 and wait; Move nozzle to center of bed at z10
;
M291 P"Nozzle will now move to center of bed to reset Z0 and calibrate probe" S3
G1 Z1 ; Drop bed for nozzle clearance
G1 X155 Y140 Z2 F4000 ; Move to bed center; Reset z to 5 to allow jogging up to touch bed to nozzle
;
G92 Z5; Dialog to allow user to jog z to touch nozzle to bed gently and then move Z down 10
;
M291 P"Jog the Z Axis until the bed and nozzle are touching and click OK" R"Setting Z=0" Z1 S3
G92 Z0 ; Set z = 0; Move probe to center of bed and get probe trigger heights
;
M291 P"Probe will now move to center of bed and measure trigger height 10 times" R"ZProbe Trigger Height Calibration" S3
G1 Z1 ; Drop bed for nozzle clearance
G1 X200 Y140 F4000 ; Move to bed centerM291 P"Heights will be found in gcode console if logging successful gcode is enabled" R"Did you remember to enabled gcode logging?" S3
; G30 S-1 10 times
;
; 1
G1 Z10
G30 S-1; 2
G1 Z10
G30 S-1; 3
G1 Z10
G30 S-1; 4
G1 Z10
G30 S-1; 5
G1 Z10
G30 S-1; 6
G1 Z10
G30 S-1; 7
G1 Z10
G30 S-1; 8
G1 Z10
G30 S-1; 9
G1 Z10
G30 S-1; 10
G1 Z10
G30 S-1M291 P"Probing complete. Turning off heaters and homing axis. Check log for trigger heights and enter into config.g" S2
; Turn off heaters
;
M104 S0 ; Set nozzle to 0 and release
M140 S0 ; Set bed to 0 and release
M906 Z1500 ; Return Z motor current to normal
G28 ; Home all; Tone to get user attention
;
M400 ; Clear movement buffer so tones play reliably
M300 S666 P500
G4 P501
M300 S1111 P300
G4 P301[/c] -
Ok, probing working and Z offset calibrated.
I'm a delta guy and this is my first Core XY and first BL Touch. I use FSRs on my 7 deltas and IR on a couple of other printers.
The whole "homing" thing is more complicated on the Core XY. I'll look over your home.g - thanks.
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I'm pretty new to CoreXY as well coming from cartesian. I just finished commisioning, that's why it's all fresh.
Here's my home all and Home X and Y for completeness.
[c]
; homeall.g
; called to home all axes
;; BLTouch prep so we don't catch the probe pin on the edge of the bed
;
M280 P3 S160 I1 ; Alarm Release and Push-Pin UP just in case it's in alarm and deployed
G4 S1
M402 ; Retract probe just in case it's down
G4 S0.5; Home XY for Z homing
;
G91 ; relative positioning
G1 Z5 F200 S2 ; Lower bed 5mm to ensure it is below the switch trigger height
M913 X50 Y50 ; set X Y motors to 50% of their normal current for homing
G1 S1 X-375 Y305 F4000 ; course home X or Y
G1 S1 X-375 F4000 ; course home X
G1 S1 Y305 F4000 ; course home Y
G1 X2 Y-2 F1000 ; move away from the endstops
G1 S1 X-10 F200 ; fine home X
G1 S1 Y10 F200 ; fine home Y
M913 X100 Y100 ; set X Y motors to 100% of their normal current; Z homing section follows
;
G90 ; absolute positioning
G1 X200 Y140 F4000 ; Move x and Y axis over to bed center so probe is on top of bed; Set lower speeds for homing
M566 Z10 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z400 ; Set maximum speeds (mm/min)
M201 Z100 ; Set maximum accelerations (mm/s^2); Probe the bed
;
M558 A1 F400 ; Set single probing at faster feed rate
G30 ; Do a single probe to home our Z axis
M558 A5 F100 ; Set tripple probing at slower feed rate
G30 ; Probe again to get a more accurate position; Set normal speeds again
M566 Z15 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z500 ; Set maximum speeds (mm/min)
M201 Z300 ; Set maximum accelerations (mm/s^2); Move X and Y back Home
;
G1 X0 Y285[/c][c]; homex.g
; called to home the X axis
;; BLTouch prep so we don't catch the probe pin on the edge of the bed
;
M280 P3 S160 I1 ; Alarm Release and Push-Pin UP just in case it's in alarm and deployed
M402 ; Retract probe just in case it's downG91 ; relative positioning
M913 X50 ; set X motors to 50% of their normal current for homing
G1 S1 X-375 F4000 ; move quickly to X axis endstop and stop there (first pass)
G1 X2 F1000 ; go back a few mm
G1 S1 X-10 F200 ; move slowly to X axis endstop once more (second pass)
G90 ; absolute positioning
M913 X100 ; set X motors to 100% of their normal current for homing[/c][c]; homey.g
; called to home the Y axis
;; BLTouch prep so we don't catch the probe pin on the edge of the bed
;
M280 P3 S160 I1 ; Alarm Release and Push-Pin UP just in case it's in alarm and deployed
M402 ; Retract probe just in case it's downG91 ; relative positioning
M913 Y50 ; set Y motors to 50% of their normal current for homing
G1 S1 Y305 F4000 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y-2 F1000 ; go back a few mm
G1 S1 Y10 F200 ; move slowly to Y axis endstop once more (second pass)
G90 ; absolute positioning
M913 Y100 ; set Y motors to 100% of their normal current for homing[/c] -
Great thanks. I updated my homez. makes sense. I'll do the update to all, x and y too.
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Ok, mesh grid compensation run complete with inexplicable results:
In 100s of probes on deltas I've never seen anything like this. How is this possible or what is the issue?
My z offset is dialed in pretty nicely. I tested it in 9 spots on the bed. But the mesh grid is completely off.
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What does your M558, M557 and G31 command look like in config.g?
What did you get for your probe height and how did you calibrate it?
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Michael, please post your homeall.g, homez.g and config.g files. If you are using either bed.g or a macro to do mesh probing instead of just G29, post that macro too.
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I'm in the process of commissioning a new corexy using 1.21 and I'm getting the grid compensation results with a large shift in the z height also. I assumed it would have found some average zero itself.
I've corrected the offset using a single probe in the center of the bed prior to grid compensation.
[[language]] M561 ; clear any bed transform G1 X200 Y200 ; Move to center of the bed G30 ; Simple probe of the bed to set z=0 G29 ; Detailed probe of the bed -
One cause of a large offset is that you are homing Z using an endstop switch, and the endstop position assumed when the switch is triggered is not accurate.
If the switch is a Z Max switch, the M208 S0 Z parameter should be set to the height at which it triggers. If the switch is a Z Min switch, use a G92 Znnn command in homez.g and homeall.g to define that position.
