I know there are some of you out there that wish they had a full 4th axis on their Fusion 640M controlled machine. I just finished installing mine on my VTC-200 and it was pretty easy. It works perfect.
you need the factory mazak 4th axis add on parameters sheet to even have a chance to pull this of. I have this document and am willing to share it. gotta get it converted over to PDF file.

To date i have Installed a Renishaw MP700 Probing system, 4th axis, and switched my machine over to run from compact flash drives instead of hard drive. Your control will boot 33% faster running
a CF drive in place of the HD. The control runs faster with less lag.

What you will need.

-Rotary table with correct servo

I bought a rotary table off another mazak that had the correct servo but you can really use anything as long as you
have the correct servo on it.

-correct MDS drive for your servo and daisy chain cable.

I used MDS-C1-V1-10 drive (1KW)

-Mazak or Homemade cable
The cable is kinda expensive to make. It was going to cost 800 in parts to do it right. I just opted to buy one from mazak for $1200 shipped. It had to
be made and only took 4 days to get! gotta love mazak for that.

Pictures and info to follow soon. Just letting you guys know you can do this yourself and the machine is setup to support it.