Acorn Six ZRI Home from scale Index

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suntravel
Posts: 3141
Joined: Thu Sep 23, 2021 3:49 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 6433DB0446C1-08115074
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
Location: Germany

Acorn Six ZRI Home from scale Index

Post by suntravel »

Here is how I setup ZRI Home on Acorn Six from Index pulse of an Aikron scale.

At the moment if an encoder input is used for a scale, it is not possible to read out the index pulse with CNC12 (Version 5.22)

But it is possible to use Z /Z from the scale to trigger an input with a F53055 Mosfet optocoupler:

https://www.amazon.de/dp/B09SWRF88D?psc ... ct_details

Since this one will only switch +DC you have to setup 4 inputs to PNP
EPlan.jpg
To test if it is working MDI:

Code: Select all

M105 /X P-9 F254 ; move to ZRI
Then readout the Abs Pos of the axis in the PID screen
PID.jpg
In this case 44492

Now in the Wizard select to create your own home file, so it will not be overwritten after modification.

Code: Select all

M92/X L1
M26/X
M105 /X P-9 F254 ; move to ZRI
M26/X L44500     ; set HomeX at 44500 encoder counts
G53 X0 L300      ; move to X0 in machine coordinates with F300
After the normal home on the sensor move to the ZRI index
set x Home again but with L44500 or a value close to the PID readout
This ensures 0 is in almost the same position as before, but with perfect ZRI precision.

On my lathe it repeats the home position within +-0.001mm
20241228_082143.jpg
20241228_082135.jpg
I printed some kind of box for the F53055 Mosfet optocoupler to mount it in the cabinet.
Box.jpg
20241228_095620.jpg
20241228_095555.jpg
20241228_095540.jpg
PDF of the modified schematic and my home file is attached.

Uwe
Attachments
S15235ZRI.pdf
(106.87 KiB) Downloaded 1 time
cnct.hom
(2.7 KiB) Not downloaded yet


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