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Do the encoders not match any of the Mesa absolute-encoder types?

linuxcnc.org/docs/stable/html/man/man9/h...%20Interface%20(SSI)

The manual turret looks like a prime candidate for motorisation...

Or get an industrial robot arm to operate the manual tool changer for you.

Look at the pins supplied by halui.

linuxcnc.org/docs/html/gui/halui.html

You might need to force home-sw-in high, so that it always thinks it's on the switch, and then it will set the index-enable.

ie, in the HAL file:
sets joint.0.home-sw-in 1

Hi Andy, I've been running a 25,000ns relatively successfully. Which is why I've been scratching my head so much. However, actually thinking out loud on here had me thinking it had to be electrical. So I dug out the oscilloscope and probed the signal. The cheap Chinese sensors had a 20k pull up resistor which was far too strong and was causing the pulse width to be way too long. So at 1900 the signal went from a pulse train to just "on".

I've swapped out the resistor and now getting good clean pulses read by the Pi with a stable speed reading up to 4000rpm.

Thank you for your suggestions as they have pointed me in the right direction. I'm in the process of modelling up a mount so i can mount two sensors to create a encoder that will do direction as you suggested.

I think you are suggesting that you could supply "fake" commutation signals from LinuxCNC to the drive, and that might be enough to persuade the drive to start working?

This is what I'm thinking. I will try it as soon as I have time and report back.

For comparison here is how the plot looks without the patch applied.

 

Hi all, new user long time lurker. My first linuxcnc experience was a sherline and a parallel port some 10 years ago. That turned into a pair of tormachs, now a vf2ssyt, and more if I had the space. Anyway...I picked up this lathe some time ago. It was originally cnc and converted to linuxcnc by the previous owner. I got it in a sort of working state. Everything was hooked up and moving but needed some refinement. At some point the PC died of unknown causes so I decided to start from scratch with trixie, kde and 2.9.6. I've got the servo thread running solid at 0.5ms, the motors all tuned and running well, the spindle drive is now controlled through modbus rather than analog, and I've added a few handy things with pyvcp. It's running fast and holding size.Now it's ready for a turret, and I'm hoping to get a recommendation. I currently have a neat manual turret but... manual is no fun. I've browsed alibaba and seen some affordable options. Also checked ebay and the pickings were slim, ancient and beat to death. I considered a tormach turret since it works so well on my sl15 but it would be nice to beat the $5k price tag.Also searching for an automatic collet closer or some sort of automatic chuck. It would be amazing to have a 16c or a 3j automatic collet... sounds like a huge amount of work if I can't find something to retrofit. Any ideas?

Looks like a fair bit of work has already gone into this. Thanks for sharing.