Yes, Steve, I was talking about the Bridgeport right angle head attachment.
Regarding the backlash in rigid tapping, compensating it in software should work great. I do rigid tapping on a lathe that has about 0.1mm backlash on the Z and compensate it in Mach and it works very well.
Have a question for you. I know you usually use PLCs on your machines. So it made me wonder why were you after a controller with lots of I/O and being 24V? Wouldn't an ESS/PLC combination make up a much cheaper solution? And possibly lots more I/O?