Servo deployed probe on Duet Maestro
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@Veti said in Servo deployed probe on Duet Maestro:
G4 P500
Probe deploys okay now with no error however the bed goes down not up towards the print head. have to hit stop
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Home is where the endstop is. You have a Z min endstop defined, so to trigger it, the nozzle must go to the bed.
Most basically G30 is how the probe is used to find the bed surface. It lets the firmware know where the bed is in relation to the nozzle, much the same way as the endstop, except that it's mobile in X and Y, so it can be used for other things as well such as creating a heightmap of the bed surface to adjust for.
Usually when you have a probe you don't use a Z endstop at all unless you want to use a Z max endstop for trying to recover after a power loss.
@Blacksheep99 said in Servo deployed probe on Duet Maestro:
however the bed goes down not up towards the print head. have to hit stop
I think your z axis is backwards. Your conception of homing away from the bed has confused you.
Can you post a photo of your bed?
Where is the Z endstop located?
Z- should make the bed and nozzle move closer together
Z+ should make them go farther apart. -
@Blacksheep99 said in Servo deployed probe on Duet Maestro:
Probe deploys okay now with no error however the bed goes down not up towards the print head. have to hit stop
have you made sure that you z movement is correct?
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@Phaedrux said in Servo deployed probe on Duet Maestro:
Home is where the endstop is. You have a Z min endstop defined, so to trigger it, the nozzle must go to the bed.
Most basically G30 is how the probe is used to find the bed surface. It lets the firmware know where the bed is in relation to the nozzle, much the same way as the endstop, except that it's mobile in X and Y, so it can be used for other things as well such as creating a heightmap of the bed surface to adjust for.
Usually when you have a probe you don't use a Z endstop at all unless you want to use a Z max endstop for trying to recover after a power loss.
@Blacksheep99 said in Servo deployed probe on Duet Maestro:
however the bed goes down not up towards the print head. have to hit stop
I think your z axis is backwards. Your conception of homing away from the bed has confused you.
Can you post a photo of your bed?
Where is the Z endstop located?
Z- should make the bed and nozzle move closer together
Z+ should make them go farther apart.Okay I think the problem is between the printer and the PC! I had it in my head that +Z should move the bed towards the head not the other way around.
I'm using the Z switch for home as that is how the printer was built. I'm trying to repair it.
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@Blacksheep99 said in Servo deployed probe on Duet Maestro:
I'm using the Z switch for home as that is how the printer was built. I'm trying to repair it.
with a z probe you dont need the switch anymore
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@Veti said in Servo deployed probe on Duet Maestro:
@Blacksheep99 said in Servo deployed probe on Duet Maestro:
I'm using the Z switch for home as that is how the printer was built. I'm trying to repair it.
with a z probe you dont need the switch anymore
Okay, great so disconnect it and redefine things in my config.g? I noticed the first line of your zprobe commands had a line to define Z Endstops by zprobe, this is what you are referring to then?
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Ok, that should help things a bit. Change the direction of rotation for the Z axis driver in your config.g with the M569 command
The endstop switch could be repurposed for a Z max endstop switch for using in power loss recovery. See what I mean here:
https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+5:+Upgrades/54#s212
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you dont need to disconnect it. you can leave it conected if you want.
just you need to adjust your homeall and homez to use the probe instead of the endstop.
like you have done in the homeall. -
@Phaedrux said in Servo deployed probe on Duet Maestro:
Your homeall isn't using the probe at all at this point, still just the endstop. Trying to control the probing manually isn't going to work very well. Better to script it out in the homing file at this point.
If you want to continue to use the Z endstop, that's fine. Here's what I would add.
M402 ; retract the pin just incase G91 ; relative positioning G1 H2 Z5 F6000 ; lift Z relative to current position G1 H1 X-285 Y-155 F1800 ; move quickly to X and Y axis endstops and stop there (first pass) G1 X5 Y5 F6000 ; go back a few mm G1 H1 X-285 Y-155 F360 ; move slowly to X and Y axis endstops once more (second pass) G1 H1 Z-155 F360 ; move Z down stopping at the endstop G90 ; absolute positioning G1 X105 Y150 Z5 F6000 ; move probe into position at bed center M401 ; deploy the probe G30 ; probe the bed M402 ; retract probe G1 X10 Y10 Z10 ; return to parked positionThe homeall I showed uses both the endstop and the probe. You could use the endstop as a first fast pass followed by the probe. It's totally up to you how you want to use it.
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Thanks to you both.
So my plan of attack now is to revert the homeall and home z such that they just use the zprobe.
I also need to modify the config.g to reverse the motor on Z
Agree?
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yes that is correct
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@Veti Do I take the Z endstop out?
; Endstops M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop M574 Z1 S1 P"zstop" ; configure active-high endstop for low end on Z via pin zstop -
@Blacksheep99 said in Servo deployed probe on Duet Maestro:
M574 Z1 S1 P"zstop" ; configure active-high endstop for low end on Z via pin zstop
change this to
M574 Z1 S2 ; configure Z-probe endstop for low end on Z -
@Veti said in Servo deployed probe on Duet Maestro:
M574 Z1 S2 ; configure Z-probe endstop for low end on Z
Same on the zprobe?
; Z-Probe M574 Z1 S1 ; Set endstops controlled by probe M950 S0 C"^zprobe.mod" ; create servo pin 0 for BLTouch M558 P8 C"^!zprobe.in" H150 F900 T6000 ; Set Z probe type to switch and the dive height + speeds G31 P50 X-50 Y-8 Z1.5 ;Set Z probe trigger value, offset and trigger height M557 X15:265 Y15:135 S20 ; define mesh grid -
@Veti said in Servo deployed probe on Duet Maestro:
M574 Z1 S2
You only need the M574 for Z once. Delete the other instance using S1.
Unless you wanted to use it as a z max endstop, in which case you physically move the endstop to the high end of Z travel, and set M574 Z2 S1. Then you can create a separate homing macro for the times when you want to home Z at the high end. This is useful when you have a print on the bed after a power loss.
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Thanks.
I think i've changed the config.g now.
The homeall is similar to how you modified it however when I home all it would need the probe in position prior to the bed moving.
This is as it is now.
M402 ; retract the pin just incase G91 ; relative positioning G1 H2 Z5 F6000 ; lift Z relative to current position G1 H1 X-285 Y-155 F1800 ; move quickly to X and Y axis endstops and stop there (first pass) G1 X5 Y5 F6000 ; go back a few mm G1 H1 X-285 Y-155 F360 ; move slowly to X and Y axis endstops once more (second pass) G1 H1 Z-155 F360 ; move Z down stopping at the endstop G90 ; absolute positioning G1 X140 Y75 Z5 F6000 ; move probe into position at bed center M401 ; deploy the probe G4 P500 G30 ; probe the bed M402 ; retract probe G1 X10 Y10 Z10 ; return to parked position -
@Blacksheep99 said in Servo deployed probe on Duet Maestro:
G1 H1 Z-155 F360 ; move Z down stopping at the endstop
remove that line
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G1 X140 Y75 Z5 F6000 ; move probe into position at bed center
remove the Z5 from that line as well
My example expected the Z axis to be homed at that point, but since that isn't happening the Z move is causing an error. But since it's not being homed, it's already been raised 5mm and doesn't need that move again.
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it would have been a lot easier if you had used the homeall that i posted at the beginning
