Adding a DRO and want to integrate with linuxcnc, recommended hardware?

Hello,

I've been a longtime LinuxCNC user, I can't quite recall but definitely since the EMC days.  Always had a lot of fun and a great experience.  Right now I've got a great setup with a desktop manual+CNC machine that can run in either mode.  Everything is working well.

I want to add a DRO, something like this Little Machine Shop DRO package that uses read heads and linear bars to measure positions.  If I got that, it wouldn't integrate with LinuxCNC at all, so obviously that's no good.

I read about the encoder setups folks are using, but I'd rather something that was post-backlash and also I like the idea of never having to home (with an absolute measurement).

Does anyone have a similar setup working well?  What hardware would you recommend?  I'm happy to spend money for the right solution.

The best I've come up with so far (with ChatGPT's help) is:

• Encoders: Heidenhain LC 483 Absolute Linear Encoders on all axes
• Interface Card: Mesa 7i93 FPGA Card with 7i74 RS-422 Breakout Board
• Power Supply: Dedicated 24V DC linear power supply
• Mounting Hardware: Custom brackets and protective enclosures

Thanks!

Andy

Do you plan to use this for CNC closed-loop positioning or just want a DRO for a manual mill?