CSMIO/IP-M and PM752 Drivers

[JAZZCNC]

I'm assuming that "a" is default, so I probably need "b" (or vice versa depending on what I find in there and assuming I don't set it in MACH4)?

Yes that's the drive setting for switching leading edge but just do it in mach4 it's easier.

Regards the noise then I wasn't meaning the sound of the spindle, it sounded clunky in its movement as if a coupler or pulley something was loose, possibly dodgy bearing. I'd be checking out the Z axis as well. You would get the same problem if something was slipping.