Hurco Hawk 5M Retrofit w/ existing motors

Okay, in that case, I am looking at the www.servodynamics.com/wp-content/uploads...0/1525brs_manual.pdf manual. It indicated two modes, both of which accept a +-10vdc control voltage to control the speed and direction of the motor. So the control loop would involve tapping into the encoder signal to count pulses and stop the motor when the commanded position has been reached? And I'd need an i/o card capable of multiple +-10vdc signals and inputs to accept each of the encoder outputs. As I'm typing all this out it sounds a lot more complex than a simple step/direction system that I'm used to.

Yes, this is a standard analog velocity mode servo, something that
LinuxCNC is well suited to control (and has advantages over step/dir systems)
including the ability to disable the drives without losing position and homing to index
(index is the Z pin on the encoder)

Well, you have interest peaked when you mentioned the advantage over the step/direction systems. Is there is write-up or guide somewhere I can read over so that I am not taking up so much of your time answering my ignorant questions? Mainly I want to get my hardware all ordered and on its way, just want to make sure I order what I need is all. Don't want to waste time/money messing with things I don't need or the wrong hardware altogether.

I received the requested information from Servo Dynamics. They are hand drawn schematics/wiring diagrams from 1992. This set of drives was custom made for Hurco and doesn't correlate with any of the other drives they have on their site. They did, however, send me a manual with a plethora of information about this one. Also, I've been reading through linuxcnc.org/docs/html/config/pncconf.html and see that it allows me to configure all of my PID settings on the servos. I've also been reading a few guides on how to properly tune the PID settings once you get everything set up. I must admit though I'm still at a loss as to which mesa card would be best for me. This is a 3 axis mill with a power drawbar, no atc (right now anyway) 6 limit switches, automatic lube, and the spindle motor is running on a 3phase rotary converter. Any suggestion on the best card to get without going way overboard?

EDIT: I believe this is the one I need: store.mesanet.com/index.php?route=produc..._id=218&search=+7I77
please correct me or offer any input if this isn't the best/correct choice.

Yes, the 5i25/7i77, 6i25/7i77 or 7i92/7i77 combinations (PCI/PCIE/Ethernet)
are Mesa's most common analog servo interface card sets and usually the
best choice if you choose Mesa cards for a analog servo+quadrature encoder
retrofit.

Thank you for confirming that detail for me. I'm servo ignorant and trying to read up on what ever information I can find. As a side note I ordered a oscilloscope that will be here Sunday just so I can test the motors and encoders before spending the $300 on the Mesa cards. Are there any other pitfalls I should look out for or am I on the right track?