Help with BLTouch

Mike McG

@bpislife
; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool on Mon Apr 16 2018 20:44:39 GMT+0200 (CEST)
G91 ; relative positioning
G1 Z5 F7200 S2 ; lift Z relative to current position
G1 S1 X-255 Y-215 F3600 ; move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-255 ; home X axis
G1 S1 Y-215 ; home Y axis
G1 X5 Y5 F7200 ; go back a few mm
G1 S1 X-255 F360 ; move slowly to X axis endstop once more (second pass)
G1 S1 Y-215 ; then move slowly to Y axis endstop
G90 ; absolute positioning
G1 X42.25 Y15 F7200 ; go to first bed probe point and home Z
G30 ; home Z by probing the bed
G1 Z5 F120 S2 ; uncomment this line to lift the nozzle after homing

G1 Z-200 S1 F400 ; move Z down until the switch triggers
G1 Z2 F400
G1 Z-200 S1 F40 ; move Z down until the switch triggers
G90 ; back to absolute mode
G92 Z0.0 S2 ; tell the firmware that we are at Z=0.3mm
; homez.g
; called to home the Z axis
G91 ; relative mode
G1 Z4 F200 S2 ; raise head 4mm to ensure it is above the switch trigger height
G90 ; back to absolute mode
;G1 X-5 Y-5 S2 F2000 ; put the head wherever you want it to be when you home Z (omit this line if it doesn't matter)
G91 ; relative mode
G1 Z-200 S1 F400 ; move Z down until the switch triggers
G1 Z2 F400
G1 Z-200 S1 F40
G90 ; back to absolute mode
G92 Z0.0 S2 ; tell the firmware that we are at Z=0.3mm

BPisLife

@mike-mcg can you confirm question 2, which was does the macros work?

Not sure why you are moving Z down to a switch trigger after you probe. This is my homez.g and I recommend you try it. Comment out everything by putting a semicolon in front of each line.

homez.g
G1 Z10 F6000 S2 ; lift Z relative to current position
G1 X42.25 Y15 F7200 ; Move probe to middle of bed
G30 ; Do a single probe to home our Z axis
G1 Z10 F500 ; Rapidly move the Z axis to Z=10.

homeall.g
G91 ; relative positioning
G1 Z5 F7200 S2 ; lift Z relative to current position
G1 S1 X-255 Y-215 F3600 ; move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-255 ; home X axis
G1 S1 Y-215 ; home Y axis
G1 X5 Y5 F7200 ; go back a few mm
G1 S1 X-255 F360 ; move slowly to X axis endstop once more (second pass)
G1 S1 Y-215 ; then move slowly to Y axis endstop
G90 ; absolute positioning
G1 Z10 F6000 S2 ; lift Z relative to current position
G1 X42.25 Y15 F7200 ; Move probe to middle of bed
G30 ; Do a single probe to home our Z axis
G1 Z10 F500 ; Rapidly move the Z axis to Z=10.

Mike McG

@bpislife thanks for your help quick question it looks like when the G30 command is issued the bed moves down until it crashes any ideas

BPisLife

@mike-mcg I think it is as easy as changing the motor direction "M569 P2 S0 to M569 P2 S1" and since you have two motors for z, M569 P4 S0 to M569 P4 S1.

Try that and let me know.

dc42

@bpislife said in Help with BLTouch:

@mike-mcg I think it is as easy as changing the motor direction "M569 P2 S0 to M569 P2 S1" and since you have two motors for z, M569 P4 S0 to M569 P4 S1.

Try that and let me know.

@Mike-McG, just to be clear: if it is the bed that moves in the Z direction (not the nozzle), then +Z should move the bed down and -Z should move the bed up. This is because the Z coordinate is the distance between the nozzle and the bed.

Mike McG

@dc42 thanks I figured that out the motor Direction was wrong but the BL touch is not deploying when the G30 command is issued does the G30 command automatically call to the deployprobe.g file?

dc42

@mike-mcg said in Help with BLTouch:

@dc42 thanks I figured that out the motor Direction was wrong but the BL touch is not deploying when the G30 command is issued does the G30 command automatically call to the deployprobe.g file?

Yes (unless you are using very old firmware), unless you have previously sent M401 to deploy the probe yourself and not used M402 to retract it.

Mike McG

I'm using 2.01 but it's still not deploying or retracting at G30 command

dc42

Try sending M401 and M402 from the command line. If they don't deploy and retract the probe, check the wiring, the config.g file, and the deployprobe.g and retractprobe.g files.

Qdeathstar

Did you cut the trace to make it 3.3v and not 5v? Also, is the bl-touch blinking red or steady red or off?

pro3d

Sorry if i missed it and I am late to this but did you post the deploy.g and retract.g? Did you do self test M280 Px S120? and M280 Px S160?

Mike McG

Well after very close examination of the trace on the back of the BL touch the trace was almost cut through but not enough it works thank you very much for all your help

Mike McG

@qdeathstar it was the 3. 3 volt logic Trace and now everything seems to be fine go figure something as small as a little Trace thanks for your help

dc42

I'm surprised that it didn't work without the trace cut.

Mike McG

I was thinking this morning I had to unplug The BLTouch To get toThe logic trace I don't think it was the trace Although the trace wasn't fully cut I think it was plugging it back in Afterwards Sounds more logical
The probe deploys And retracts When I do a homeall or homez But I can't get G 29 Were mesh Bed leveling To work Says something aboutIt must be home first Even if it has already ZYX all Show 0 I know that I'm missing something right?
Any ideas On today's Problem lol Thanks guys I really mean it I'am new to this board and the firmware So I'm in the learning curve
Thanks again

Phaedrux

What do your homing files look like now?