7i90hd with 7i40 for lathe

Considering changing from mach-3 with 2 x geko 320's "driving 1/3 hp 80v dc brushed pacific science servos" the encoders are working, i think 2000-ppr quadrature if I am not mistaken.

A laptop configuration, with an Ethernet fpga, would be first prize.

1) Will this hardware be suitable for my Myford super 7 lathe.
2) will a four slot disk, hall effect sensor, pickup be appropriate for spindle feedback. I would like to do thread-cutting on the machine.
3) what other daughter boards would best suit for Spindle pwm, coolant relay, limit switches etc. Perhaps auto tool changer in the future.

I don't know for sure, it looks like it should not be too bad of a fit. What is the peak current rating and torque constant of the motors?

A 7i37TA is a nice addition.

Thanks Todd, group, could you please advise or elaborate on the following:

Looked into the motor spec, and the way I read it as follows.
1750 rpm at 120v dc armature, therefore my max rpm would be 1200 odd. at 80v.
Gearing on the X and Z axis would be 2mm per rev therefore 2,4m per minute rapid, ok? on a small lathe.
Encodres are 500 cpr 2000 counts in quadrature therefore 1000 counts per mm?
92oz-in torque per amp, enough at 7amps (640oz-in)? Back EMF Ke=68v/kRPM

Thinking of the 7i80hd opposed to the 7i90, the way I understand, is that Linux CNC dose all the calcs PC side.
The FPGA dose not do any math? so with the encoder count rather high the 7i90 could run out of steam on the interface to PC side.(Can also get a 7i80hd locally and a 7i37 ''one with common ground'')

Can the 7i37 outputs be configured for some step/dir for a toolchanger driven by a stepper in the future?

Regards Zack

With Mesa hardware, the encoder count has little if anything to do with the speed of the connection between the Mesa hardware and the PC (parallel port, PCI, ethernet). The encoder is counted in the Mesa hardware and it then reports the position to Linuxcnc every servo period (Linuxcnc never sees the individual encoder counts)
1000counts/mm isn't all that high, definitely not too high for any Mesa card, and your motors max rpm of 2400mm/min (about 90ips) is far from blazing fast. The encoder count will be what, 40kHz at that speed, not a problem.

Yes, some of the outputs of a 7i37 can be configured as stepgens.