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got the Yaskawa encoder to work
www.youtube.com/shorts/YpUjbus9lQc

It's from LY CNC, which you can find on Alibaba. This is the 3040 model. I watched Stephan Gotteswinter's video about his new micro mill, and was inspired to do something similar. It was going to be difficult to get the same epoxy-granite frame he started with, here in the states. This cast-iron frame was a similar design, so I decided to try it out. There was a fair amount of waiting involved but the machine seems fairly sound.

With the spindle half-way down, I'm getting 0.000,5 in (13 microns) deflection with 20 lbf (88 N) pressing against the spindle nose. I think those are similar numbers to Gotteswinter's thumb test.

I got out the master square to check the perpendicularity of the X and Y axes. They're very square--within a few tenths (0.000,1 inch = 3 microns) over 10 inches (250 mm). The YZ plane leans back about 0.002" over the 7 inch travel of Z. In the XZ plane, there's 0.003" deviation over the same distance. I might eventually try to correct that but the parts I'm making are fairly small, so maybe it won't be a problem.

Do you have a thread about your retrofit?

Thanks! I'll give it a try tomorrow. I just got back from a wedding so I haven't tried your updated file yet.