Scratched bigger CNC lathe boss just said. AWWW

[evo4wrx]

Ive had a lot of success with a large scratch build CNC lathe I built sometime ago. Ive decided to build a bigger CNC center lathe using a large center lathe as the base.

Ive got some left over equipment from 4 cnc builds now...
Just wondering if anyone knows which cards I need to marry up VSD XE 160 to a MESANET 5I20.

I also have 2 x 7137TA
and 1 x 7147S RS-422 + AOUT.

I also have
2 x FANUC A06B-0128-B175 AC SERVO MOTOR a6/3000
2 x FANUC α22/2000 AC Servo Motor A06B-0147-B075

I realise I will have to change the encoders. I plan to use EMC for this build.
Does anyone have any ideas or comments.

Rev/s speeds required.

250nm torque on Spindle 0 Backlash Im going to couple a conedrive on a 3000RPM redcap

1m/sec on Z and X. Zero Backlash NSK using 20mm lead pitch screws. The entire weight of the bed is only 105kg.

[Al_The_Man]

You can either change the encoders to Hall type commutation tracks or J. Elson makes a convertor board for the existing encoders.
Al.

[evo4wrx]

I thought I could use Renco quadrature differential encoders.
As long as they were incremental the VSD would determin the commutation required.

Are there any further break out boards I require to interface the 5I20 with the VSD's.

[Al_The_Man]

I there any particular reason not to use the Fanuc encoders? Is this a frequency limitation on the VSD?
Al.

[evo4wrx]

Not really. Not sure to be honest.
I know Granite has told me before that these work so I was just going this path.

[evo4wrx]

Has anyone tried a 7176 Step IO and 5I25 with the VSDXE yet?
Running EMC2 of course. It seems to be a far easier way to go.

[Al_The_Man]

I see these B175/B075 type so I believe they are Absolute Incremental type, which could be used, but these are often 1,000,000 counts/rev, so they may be a bit high!.
Too bad as most of the S motors are 2000 incremental.
Al.

[tnimble]

Originally Posted by evo4wrx Has anyone tried a 7176 Step IO and 5I25 with the VSDXE yet? Running EMC2 of course. It seems to be a far easier way to go.

No need for the 7i76. Directly (optio isolated) use the PWM outputs from the Mesa FPGA board.

That gives a far better control response than converting an (semi) analogue (PWM) velocity/torque command, into a position commond which is more or less randomly stretched out over time by the 7i76. which in turn is converted back into a velocity/torque command by the VSD again stretched out over time.

If you need to use step+dir, the HostMot driver can directly generate that from EMC2 without all the time streching going on. But still PWM is better suited for Servo control.

[PATMAC]

evo will you post a pict ??? of lathe also