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Re: AcornSix - Zri Homing with linear scales
Posted: Tue Apr 09, 2024 3:23 pm
by tblough
Those variables will only change when the encoder is sitting on the index mark. You will need to check the variable when the asterisk is showing on the PID screen.
Re: AcornSix - Zri Homing with linear scales
Posted: Tue Apr 09, 2024 5:12 pm
by RC-Lights
Hi Tom,
Is that really true? the lathe Operation manual says, that These variable will contain the number of counts of the last index pulse.
Michael
Re: AcornSix - Zri Homing with linear scales
Posted: Thu Apr 11, 2024 10:14 am
by RC-Lights
no idea ?
i saw, that in the latest manual for PLC programming these variables are not listet. Are they kind of new and is there maybe a bug ?
Michael
Re: AcornSix - Zri Homing with linear scales
Posted: Thu Apr 11, 2024 1:49 pm
by cncsnw
Tom was probably thinking you meant #23401-#23408.
Just out of curiosity, do #23401 and #23402 change state on your system, corresponding to whether or not the asterisk is showing?
Yes, I think #25101-#25108 are relatively new. Presumably they were added to avoid the awkward timing issues you get when you try to use #23401-#23408. Perhaps the new variables have not been fully implemented on Acorn.
Re: AcornSix - Zri Homing with linear scales
Posted: Thu Apr 11, 2024 4:14 pm
by tblough
Just one point I'm sure you are aware of. The X-axis will not have an index pulse. The index pulse will be on whatever axis the SCALE is attached to.
Re: AcornSix - Zri Homing with linear scales
Posted: Thu Apr 11, 2024 4:45 pm
by RC-Lights
cncsnw wrote: ↑Thu Apr 11, 2024 1:49 pm
Tom was probably thinking you meant #23401-#23408.
Just out of curiosity, do #23401 and #23402 change state on your system, corresponding to whether or not the asterisk is showing?
Yes, I think #25101-#25108 are relatively new. Presumably they were added to avoid the awkward timing issues you get when you try to use #23401-#23408. Perhaps the new variables have not been fully implemented on Acorn.
Yes, probably He means #23401-#23408
I have to Check, if These variable changes, good idea. But from my understanding it World be really difficult to built a precise Homing macro with it.
tblough wrote: ↑Thu Apr 11, 2024 4:14 pm
Just one point I'm sure you are aware of. The X-axis will not have an index pulse. The index pulse will be on whatever axis the SCALE is attached to.
Of course i have scales on Z and X Axis and they are configured in the Wizard and the closed loop System works well. To avoid a mistake i checked All of the variables from 25101 - 25108 and they are all -1.
Re: AcornSix - Zri Homing with linear scales
Posted: Thu Apr 25, 2024 3:41 am
by RC-Lights
hi all, i want do give a small update:
the ZRI Homing process is working now ! very happy about it.
but i need to use a workaround. since the RS422 Signal cannot switch an Input and the variable in Acorn is not written from the INdex pulse, i use an little Optocoupler transistor from 5V to 24V to switch an Input on and off when reaching the Index Pulse.
this is working great and i wrote a homing makro and everything is fine now. thank you for your support.
Re: AcornSix - Zri Homing with linear scales
Posted: Thu Apr 25, 2024 5:16 am
by killacam
RC-Lights wrote: ↑Thu Apr 25, 2024 3:41 am
hi all, i want do give a small update:
the ZRI Homing process is working now ! very happy about it.
but i need to use a workaround. since the RS422 Signal cannot switch an Input and the variable in Acorn is not written from the INdex pulse, i use an little Optocoupler transistor from 5V to 24V to switch an Input on and off when reaching the Index Pulse.
this is working great and i wrote a homing makro and everything is fine now. thank you for your support.
Thanks or posting this & the amazon link - I am going down a similar path but with a closed loop stepper motor that has a 3 pole encoder without a drive that supports Zri homing signals - I am looking at the CNC4PC C87 Encoder Index Homing Board to help integrate the Z signal - not sure if you looked at that option or if that board will do what i think it will do
Re: AcornSix - Zri Homing with linear scales
Posted: Fri Apr 26, 2024 3:52 pm
by cnckeith
thanks for reporting back
Re: AcornSix - Zri Homing with linear scales
Posted: Mon Apr 29, 2024 2:10 am
by RC-Lights
https://youtube.com/shorts/wuulF71HwA4? ... 6oRPEjjFni
Here a short Video how accurate the Homing process is now