optical ABL for 6HC OPB 880T51

oliof

@Phaedrux think of a bistable mechanism that is triggered by hitting those tabs. So the deployprobe should be a series of moves in front and then to touch the tab, and the retract probe should be a similar series of moves, just to the other tab.

BoA

https://hotends.dozuki.com/Wiki/TouchMI_Sensor(EN)

rexx

@oliof

exactly!
any chance you have an example for me i am new with codes by far and could use a hand

oliof

@rexx

Here is how I envision it, with a lot of assumptions you need to double and triple check on your machine. All distances are for the sake of the example and since I know nothing about your machine are just to make maths easier to explain the process.

Assuming you have left handed coordinate system with the coordinate origin at the front left, and a 250x250mm bed, with the "deploy tab" 10mm behind the bed on the left hand side, and the "retract tab" 10mm behind the bed on the right hand side. The tabs are inset 5mm from the edge of the bed on the left hand side, and 30mm from the edge of the bed on the right hand side, and the mechanism is to the left hand side of your nozzle with an X offset of 25mm and the probe actuator in line with the probe.

I assume you have a z endstop and the tab activation height is 10mm.

your deployprobe.g would look somewhat like this.

G28                         ; home all axes before deploying
M400                        ; clear movement queue
M913 X30 Y30                ; reduce motor current for safety 
M208 Y0:262                 ; extend Y axis for probe actuation
G0 X125 Y125 Z10 F600       ; move toolhead to safe position 
G0 X30                      ; move  toolhead to trigger position X-- tab position (5) plus probe offset (25)
G0 Y260                     ; move  toolhead to trigger position Y 
G0 Y220                     ; back off from trigger tab
G0 X150 Y125                ; move toolhead so deployed probe is at center of bed
M400                        ; clear movement queue 
M208 Y0:250                 ; reset Y axis for printing
M913 X100 Y100              ; reset motor currents to standard

your retractprobe.g would look somewhat like this

M400                        ; clear movement queue 
M913 X30 Y30                ; reduce motor current for safety 
M208 Y0:262                 ; extend Y axis for probe actuation
G0 Y125 X245 Z10   F600     ; move toolhead to trigger position X -- tab position (220) plus probe offset (25)  
G0 Y260                     ; move toolhead to trigger position Y
G0 Y220                     ; back off from trigger tab
G0 X150  Y125               ; move toolhead to center of bed
M400                        ; clear movement queue
M208 Y0:250                 ; reset Y axis for printing
M913 X100 Y100              ; reset motor currents to standard

Again, this is completely hypothetical and may or may not work for your machine.

The whole thing could be made smarter with metacommands (for example only homing if an axis is not homed), and if you have a way to check whether actuation works (for example by closing a contact that is set up as a trigger, setting a global variable depending on whether it is set or not) this could be made relatively safe. Before you blindly add code snippets, run them line by line and have a hand on the emergency stop button on every step.

A Former User

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A Former User

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rexx

@oliof
exactly what i was looking for thank you! and i understand to check my work and is only for example only so i can read backwards saving me decent time catching on faster
its not rocket science i get that but overwhelming at first and ever changing so this in is much appreciated!

Cheers

oliof

@rexx we all started out somewhere (-:

rexx

@arnold_r_clark
Reguars thank you for that

this is perfect
the new guys(me) love the little things and your help is appreciated here

should you be interested in helping remote for compensation i would be interested in that sould you be.

and if i am stepping over the rules here i applogize and will retract if found inappropriate (DC42 and friends)

i feel i will be able to hash it out but its gonna be a long curve i would like it a bit straighter..

thank you Arnold

rexx

@arnold_r_clark

here is the abl i am using

the bar on this ABL is hit with tabs deploying the pin another tab is hit to return the probe
at the top you can see the pin to switch intersection is fixed an PCB OPTICAL will not fit this part unless i modifiy but not sure that is ideal the mounting is tiny tiny.... of course and would not fit unless i sepetate the pcb out board....hummmm

thanks for your efforts

Cheers

rexx

@arnold_r_clark

i just re read your post to "correlation" missed that part my bad i understand to implement this and i am good....

question: does a 222 resistor and 101 come in an inline form how do you find the impedances to replicate or do you know what the values are for them OR do you think mounting this board remote is a better route

either way i get the set up now after looking at the 4 wires switch to 3 wire outs but I only thought there was one resistor needed so that 90%

thanks

rexx

@rexx use a meter dummy....

rexx

@oliof

under your deployprobe.g lines 4 and 11 have : full colon yet 8 does not what does this difference mean?

if i set the reduce motor current for probing does it mean X30 y30 in the M906 means 30=300 mA each?
i have 3 nema 23 and 1 nema 17 so i think i will start at 800mA for the 17 and 1800 mA for the 23... for normal current how does the current reduction work by % or individual axis current set points?

here is the 2 wire optical for xy stops they trigger with no power and a contact multi-metre setting just fine could i possibly use them like a micro switch? IO in and ground

they are hamlin 0404 (59085-040)

also noticed i think but can you momentarily go outside my X stop to deploy or do i need to move the stop so its with in the stops to deploy?

i am getting closer i can smell it and i haven't even plugged in yet

oliof

@rexx said in optical ABL for 6HC OPB 880T51:

under your deployprobe.g lines 4 and 11 have : full colon yet 8 does not what does this difference mean?

Lines 4 and 11 are M208 commands. I prefer the syntax variant where I set minima and maxima separated by a colon. Line 8 is a G0 command and the space in the example between Y and 220 is wrong. It should be G0 Y220.

if i set the reduce motor current for probing does it mean X30 y30 in the M906 means 30=300 mA each?

Good catch, that should have been M913. Sorry for this mistake! I will fix my mistakes now.

i have 3 nema 23 and 1 nema 17 so i think i will start at 800mA for the 17 and 1800 mA for the 23... for normal current how does the current reduction work by % or individual axis current set points?

With the M913 command as mentioned above.

rexx

@oliof

so with M208 can i go outside the stops momentarily? like 10mm to deploy me ABL?
or must i have the abl inside the stops?
its a hit to deploy and stow and the stow is like 5-10mm past the stop but i could move the trigger tab to accommodate but don't want to if i dont need to.and can pass the stop slightly

my home pos is on the back right
my bed is 235x235x300
is it typical to use 0 for home or better to use closest bed corner from home as 0?

reason is my home pos to the start of the bed is a bit like x30y180 if 0 is home
or am i better to use x-30y-180 for home
or should i just use ocotoprint and forget all this and baby step the numbers that way??and record...
i think my duet 2 is set home 0 bed +##
just trying to get an insight on the best approach here

rexx

@oliof no applozies needed

oliof

@rexx it depends where the endstops are and if you can physically pass them by. also depends on the length of you trigger leg if you actually need to pass them by. Without more detailed photos of your printer I'll probably give misleading answers.

rexx

@oliof
good day,
the travel is there the oem setup allowed bump past the stop i have about an inch and only need .5" to tap the abl retract away but at the stop switch its not enough to complete the retract probe tap completely the printer was duel material and nozzzles and now only one so i have extra room

it also may make more simplicity to simply chop the trigger tab down .5" where any home would retract the probe if it was deployed when homing then i only need deploy.g i think...
and i would need to home in a way it goes to the back center (outside the bed) then x's homed as the tabs and slider are to be hit from the side to side not back to front

for deploy similar just the other sides tab but first must be somewhere in the middle of x then to the back not to catch on an angle but side to side for the ABL use only.

when just the x stop is hit can it go 13mm more in that direction being told in the code for only x stop?

rexx

@oliof

i will snap a pic soon for you getting close with the wiring

for my abl optical switch if i use a 10k resistor across 5v and gnd guys said series resistor is that diffrent or just the way its wired?

are they directional a typical resistor?

sorry for all the school questions...

the head is back in the machine and its not gonna ever print single wall print with only supports at 2000% (the oem limitations no wall line counts 1 only no turning off supports N/A no raft N/A to revome either the sparse or 100% infil option only is pure sponcership)
now just dont crash it... stay tuned

rexx

@rexx said in optical ABL for 6HC OPB 880T51:

hamlin 0404 (59085-040)
hey good day
the two wire hamlin switchs are magnetic so A.picture is how they will go correct?

does my opto 4 wire need to be wired like B pic or C picture for use as probe trigger