Centroid Community CNC Support Forum

Posted: **Sat Dec 28, 2024 7:02 am**

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

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

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

I printed some kind of box for the F53055 Mosfet optocoupler to mount it in the cabinet.

PDF of the modified schematic and my home file is attached.

Uwe

Centroid Community CNC Support Forum

Acorn Six ZRI Home from scale Index

Acorn Six ZRI Home from scale Index