Mesa LinuxCNC supported boards + other hardwares

I am new to the LinuxCNC environment. I want to set up 3 axes high-speed Micro Milling Machine setup using LinuxCNC. I have made my Linear stage which is ball screw driven and currently using with commercial CNC controls. But now I want to shift towards the LinuxCNC platform. Please suggests to me all the list of Hardware requirements that are currently used by major of the groups???
Your Valuable suggestions help me a lot.

What type of motors stepper or servo?
What kind of spindle control are you using?
How much I/O do you need for other stuff like coolant etc?
Do you wish to rigid tap eventually?
Will you want to add a 4th axis in the future?
What kind of PC interface would you like to: use printer port, PCI/PCIe or Ethernet ?

The majority of people use MESA boards but there are other options.

Chris

Motors: AC Servo (200W), In future BLDC
Feedback Device: Currently using Glass scale linear encoder with 1 Micron Accuracy...But for LinuxCNC, would like to go with a rotary encoders
Spindle Control: currently using Ibag spindle (max. speed 1,20,000 RPM)
And of course, we will plan to extend to 5 axis setup in the future but no need for rigid tapping required as of now.
PC interface: Ethernet

kindly suggest better options available currently with sufficient documentation.

Doesn't really matter what mechanical parts you are controlling. With Mesa cards you can control just about anything.

You need to be more specific in terms of interfaces.
What inputs do the AC servo drivers support? Step/dir? +/-10V analog? CANBUS? Why would you want to downgrade AC servos to BLDC servos ( actually is there really a difference?
I take it the servos are closed loop back to the drivers. Why would you what to downgrade from linear encoders to rotary encoders for closing the position back to Linuxcnc ? Mesa cards and Linuxcnc don't care, but linear encoders remove a bunch of error sources.
What is that spindle drive interface? Step/Dir? PWM?
How many lines of I/O do you need? Count the various coolant, spindle on/off, End and home switches, drive enable, drive fault, tool height setter, probes etc.
Mark

If your servos have +10,-10 volt control input then one solution is the 7I92M together with the (very popular) 7i77
store.mesanet.com/index.php?route=produc...oduct&product_id=302
store.mesanet.com/index.php?route=produc...oduct&product_id=120