Threading with A B phase only?

how many teeth did you choose for the driven pulley and the driving pulley?

60 tooth for both

Many thanks for that. I have now ordered a 60 tooth 5mm pitch pulley for the driven end. However I was thinking that in order to get maximum stepping accuracy for cutter movements significantly below 0.05mm (the graduation collar division on the cross slide hand wheel), it would be good to lower the driving pulley to 40 teeth or even 30 teeth. Ideally I would like to step accurately in increments of 0.025mm (1/1000 inch) which is the graduation division on the top slide hand wheel. What do you think? What minimum movements are you able to accurately achieve with 60:60 gearing?

Hi
I'm new to the forum and also new with Linuxcnc. But I managed to install a MESA 7i76e in Linuxcnc 2.7. My question now concerns exactly what I read above: A 24V 3-wire NPN Prox can be connected directly to 5V logic . Is this really true that I can connect the output signal directly to the encoder connection (index) on TB3 with an OMRON EE-SX670A (NPN)? No risk to destroy the 7i76e? And can I also use the output signal of a second NPN Omron EE-SX670A with the encoder connector A? The signal of a perforated disc with 12 holes is read off. - Thank you very much for your help!

As long as it is connected as described with a voltage divider.

You can connect a 24V _NPN_ proximity switch directly to 5V inputs since
the output of the NPN switch is switched to ground (not 24V). This does require a pullup resistor
to 5V (the 7I76E encoder inputs have a 2K pullup resistor built in)

The disadvantage of this (24V power) is that a wiring error(like a missing ground)
could damage the 7I76Es encoder inputs.

However, if you look at its specifications, the OMRON EE-SX670A will run on 5V so why not
just run it on 5V?

Hi
Thank you very much for the very fast response. The situation is that I have already made - for Mach3 with ESS Smoothstepper - the wiring with 24VDC. - Is there any other way to install the index signal on the 7I76E? For example, on a port on TB5 or TB6? A and B signal I could refer directly from the servo inverter. The index signal however not, since I have the engine 1: 2. So I would then get 2 index signals per revolution. And that probably can not be entered into a LinuxCNC config file?
Regards
Daniel

Thanks a lot! I think that I will run the Omron on 5V. So there will be no problem!

Daniel