micro switch for Z homing

I love the idea of the IR probe, but I cannot get it to work consistently.
So I have moved temporarily to a micro switch solution for Z homing.
I have "extracted" a micro switch from a dead printer and found its specification online [www.yatelian.com].
I have designed an adjustable enclosure for the switch that clips on the z lower mount (in turned out to be not very adjustable because the bolts hit the z lower mount, however the 2-3 mm travel space is enough).
zmicro.stl
I changed the homez.g and homeall.g files to use the new homing method. Here it is homez.g:

G91
G1 Z5 F200
G90
; IR probe
; G1 X55 Y0
; G30
; G1 Z0 F200
; microswitch
G1 X55 Y35
M558 P0
G92 Z0
G1 Z-100 F200 S1
G92 Z0
G1 Z2
G1 Z-5 F40 S1
G92 Z0
M558 P1

I still hope that the IR probe will improve in the future, specially for bed leveling. I will try dc42's firmware in the next days.

Ciao, Andrea.

Nice and simple. Will be interesting to see if it stays accurate after a bit of use. If so I would be keen to try something similar. I suppose the only downside is that it isnt measuring direct to the bed.

regards
Andy

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Ormerod #318
www.zoomworks.org - Free and Open Source Stuff

Andy

Like the idea, the IR probe inconsistency is driving me nutty, 1 question, what are the electrical connections?

regards

Rickity

Nice mod =)

I believe the original design had a switch for Z home, you can see it on the picture from the build instuctions 'printing' page



Matt

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Limited Edition Red RS Ormerod 1 #144 of 200 - RRP 1.09fw
iamburnys Ormerod Upgrades Github
Follow me on ThingiVerse My Designs

that's X home I think Matt

Ah yeh your right Ray, so many axes, so many switches

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Limited Edition Red RS Ormerod 1 #144 of 200 - RRP 1.09fw
iamburnys Ormerod Upgrades Github
Follow me on ThingiVerse My Designs

you've got an eye for detail though Matt - it took me a few minutes with my pince-nez to find the µswitch in that pic after you'd pointed it out [edit - there's an appreciable lack of atx power cables in there too]

Edited 1 time(s). Last edit at 02/12/2014 05:18PM by rayhicks.

Quote
rickity
Andy

Like the idea, the IR probe inconsistency is driving me nutty, 1 question, what are the electrical connections?

regards

Rickity

It is a normally closed switch that connects to the duet board on the three free pins on the right of the z-motor connector, exactly in the same way of the Y-axis switch.

Could you show how to switch is connected to the board? I am having problem with the IR Z Homing as well. Thanks

Hi mancinism,

I have grabbed the picture from the ormerod assembly instructions from [www.reprappro.com] and I have added the wiring for the z endstop. I hope this answers your question.



Ciao, Andrea.

Many thanks Andrea, all is now very clear.

Thanks Andrea.

Hi Andrea,


i have no your z-micrositch design printed an mounted. Homing via homez.g works perfect.

Can you please post your homeall.g ???

Greetings

Hi muggi,

the following is my homeall.g file, as you can see it is just the concatenation of the homing instructions for the X Y and Z axes.

G91
G1 Z5 F200
G90
G1 X-240 F2000 S1
G92 X0
G1 X3 F200
G1 X-30 S1
G92 X0
G1 X55 F2000
G92 Y0
G1 Y220 F2000 S1
G92 Y200
; IR probe
; G1 Y0
; G30
; G1 Z0 F200
; microswitch
G1 X55 Y35
M558 P0
G92 Z0
G1 Z-100 F200 S1
G92 Z0
G1 Z2
G1 Z-5 F40 S1
G92 Z0
G1 Z0
M558 P1

Hope you don't get annoyed at this, but it's not a good way to do it.
If you re-level the bed, you have to set the switch up again, and constantly use the same glass.
Hence I use the TILT method, which allows for a change in thickness of glass, and doesn't need adjusting after leveling the bed...
The only time it needs setting up is if the HotEnd assembly is removed.... And it takes 2 minutes to edit the HomeZ.g file...

M104 S215
G91
G1 Z15 F1500
G90
G1 X100 Y100 F1500
M109 S215
G1 Z-200 F150 S1
G92 Z-0.6; This is the only line that needs editing to suit your needs
G1 Z0
G90

PS Before any one mentions it, the HotEnd isn't at a crazy angle, the camera was... But it was before I changed the 9mm bearing for a 10mm one, so there was a slight tilt on it...
Normaly I can get the adjustment down to 0.6mm if I ever replace the HotEnd... And it gives me a consistant Z Zero no matter what glass I use. I've found it the best thing since sliced bread......

Edited 2 time(s). Last edit at 06/08/2014 01:28AM by KimBrown.

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Please send me a PM if you have suggestions, or problems with Big Blue 360.
I won't see comments in threads, as I move around to much.
Working Link to Big Blue 360 Complete

PS if you fit the TILT switch then you can either use the Original Probe for homing X, or replace that with a microswitch to......
It stops all the messing about then...


Note the HotEnd Heater wires are swapped over in the diagram above to reflect the wiring of the HotEnd cable connector, as the Manual was wrong.
Yellow is POSITIVE... Not that it matters, unless you wire in a LED to tell you when the Heater is on, like I did.

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Please send me a PM if you have suggestions, or problems with Big Blue 360.
I won't see comments in threads, as I move around to much.
Working Link to Big Blue 360 Complete

Buongiorno Andrea,

and hello dear Sir´s.

So, this was or has been a good idea, but is does not work with Ormerod 2 , I create a new, long platform for Z switch. Hier you can see and download a Picture SYS-.g files and STL for long Platform.

homez.g

G91
G1 Z5 F200
G90
; IR probe
; G1 X55 Y0
; G30
; G1 Z0 F200
; microswitch
G1 X55 Y35
M558 P0
G92 Z0
G1 Z-100 F200 S1
G92 Z0
G1 Z2
G1 Z-5 F40 S1
G92 Z0
M558 P1

homeall.g

G91               ; set movement to relative mode
G1 Z5 F200        ; move Z up 5mm
G90               ; set movement to absolute mode
M558 P1           ; set probe to unmodulated mode
G1 X-240 F2000 S1 ; home X
G92 X0            ; set position to X=0
G1 X3 F200        ; move axis away from X=0
G1 X-5 F200 S1    ; home again, slower
G92 X0            ; set position to X=0
G1 X15 F2000      ; ADJUST the X value to put the nozzle on the edge of the bed
G92 X0            ; set position to X=0
M558 P2           ; set probe to modulated mode
G1 X45 F2000      ; move X, ADJUST the X value to get Z probe over target
G92 Y0            ; set position to Y=0
G1 Y-240 F2000 S1 ; home Y
G92 Y0            ; set position to Y=0
G1 Y3 F200        ; move Y axis out
G1 Y-5 F200 S1    ; home Y, slower
G92 Y0            ; set position to Y=0
G1 Y3 F2000       ; ADJUST the Y value to put the nozzle on the edge of the bed
G92 Y0            ; set position to Y=0
;G1 Y0 F2000       ; move Y, ADJUST the Y value to get Z probe over target
;G30               ; home Z, using values from G31 in config.g
;G1 Z5 F200        ; Move Z up to Z=5
G1 X55 Y35
M558 P0
G92 Z0
G1 Z-100 F200 S1
G92 Z0
G1 Z2
G1 Z-5 F40 S1
G92 Z0
M558 P1
;G1 X0 Y0 F2000    ; Move to X=0 Y=0 
;G1 Z0 F200        ; Move to Z=0