Fanuc retrofit retaining original AC servo motors and drives

I have a Kitamura MyCenter 1 with a Fanuc 10M control that I would like to convert to LinuxCNC. This is a fully functioning machine, the only problem is that limited memory, and maximum 9600 Baud DNC make it difficult to do 3D surfacing, and modern constant load tool paths without pausing for the data to catch up. I would also like to add a 4th axis.

This has A06B-6057-H004 (X and Y axis) and A06B-6057-H005 (Z axis) digital drives that get the commutation from the control. The encoders are not serial, and have the 4 commutation channels.

I have found several threads discussing this type of retrofit, but I have not found any conclusion if anyone has successfully completed one. Is this possible?

It looks like the bldc component in LinuxCNC has the ability to interpret the Fanuc gray scale encoder commutation, and provide 6 PWM outputs for the drives, but in a previous post PWM, mentioned that it would take a custom daughter card.

I could swap the drives out for older A06B-6050 analog drives, but I would like to know if someone has successfully done this.

there are Fanuc Retrofits in the Forum Discussed

IF You are able to get some Electronic Modification Meaning Wirering up
I Gues the /I77 will be best to go for as you can reatch full 3D serfacing at a upp to 20m/min speed
your Center is constructed to a max of 5m/min at 7KW

The Encoders will fit the Mesa Stuff

There is a Mesa module for the Fanuc digital encoders.
linuxcnc.org/docs/2.7/html/man/man9/hostmot2.9.html#BiSS

Thanks for the replies.

pl7i92,
The 7i77 is an analog output board. Are you suggesting that I need to replace my drives with the older analog ones? Will the control be faster with the analog drives as it does not require the 6 channels of pwm per axis? Also is it possible to get the feeds beyond the current 5m/min? How much of this limit was due to the old Fanuc control speed? The rapids are limited to 12 m/min, so the max would be somewhere below that.

Andy,
That encoder module looks it is for the serial encoders. Does it require custom firmware? Does it handle the absolute encoders? Would a backup battery need to be added? Most of my encoders are not serial, but the 4th axis I have has an absolute AA64 serial encoder. I was going to swap out the motor for an older one to get the quadrature encoder, but it would be nice to have an absolute on the 4th axis as depending on what is mounted, it may not be possible to do a full rotation to home.
Also if I use this mesa module, I assume I would need to stick with the digital drives and pwm output, as the analog drives get commutation directly from the older encoders.

It would be possible to run both sorts of servo. This would need a custom firmware, but I am fairly sure you would need that anyway.

I would be looking at the Mesa 5i24 as the FPGA card, just as it has the most pins for the pound (or bits for the buck, IO for the Euro, whatever)

Thanks. I used a 6i24 for my lathe retrofit, so that or a 5i24 will be a good place to start.
I would like to stick with the 6057 digital drives, as I already have them, and I know they are functioning. I just would need to buy one additional drive for the 4th axis. I would feel more confident about that route if I knew someone else had successfully got that going.