7i97 + 7i76D with Mesa Configuration Tool

Best place to get these big schematics scanned ?? They are 18x26 by rough measurements, big paper  but getting frail. It's the full set of schematics afaict.

pasteboard.co/asyyXi4JY7pz.jpg

There is no inherit advantage to encoders vs resolvers. Resolvers are a bit more robust . They are also more susceptible to noise. It occurred to me , as I used a 7177 /5i25 and a 7i84( for my pendent) , that you will need more then 16 outputs. The 1212 is a more complicated machine then a Talon. As you read they the schematics, consider all the ins and outs. Also consider the age of the machine and technology available at the time. I wouldn’t waste my time trying to plug into the original cinci I/o racks. The inputs are probably 24vdc and the outputs 110vac. I used an opto 22 rack for the out puts. A 7i77 uses inverted out puts so you will need the opto rack that works with them, which I can’t remember right this second. I used a terminal block model.
If you have Getty’s motors and drives, and the drives are N350 scr drives, consider replacing them. They a old as dirt, Gettys doesn’t like supporting them , hard to troubleshoot and troublesome. Gettys motors are insanely robust. Motors with the open tach have a 7v tach, the small enclosed Electrocraft tach is 3v .

There exists a IO rack to rs485 system , and I am enquiring about it.

If I wind up doing a retrofit, the IO rack is coming out for sure and I am going to use at least 2 7i77 or something of that sort.

I will look into all of the finer details shortly, once the rigger drop the machine tomorrow. Actually they are dropping 4 machines tomorrow. The mills I have in hand, those aren't complicated outside of the tool changer. This lathe though, she's a whole other animal. 

the lathe landed today, and the controls are 

Arca 900 real to real punch tape. So, it's a fully custom retrofit now. Definitely looks like resolvers for positioning. All DC controls, Reliance VS spindle drive and the only info I have on the servo control is that the say ArcaDrive. 

I will be heading to office max to get the schematics scanned and I will get them uploaded tonight

1st set of schematics, I have another set that looks slightly worse for wear, I am not sure if I should unroll them yet.

I am certain someone somewhere needs these

drive.google.com/file/d/1FgP3BYVFzbULthE...H-Q/view?usp=sharing

I just found the original source code on printed sheets in assembler, and it is surprisingly well commented. I will have to find a way to input all of it, it is on old school ruled lined printer paper I think 16 inches wide.

I'm calling Mesa electronics tomorrow, fairly sure I'm sticking with resolvers. They are durable and are capable of the precision i need.


I could definitely use some help on this retrofit, the tool changer looks challenging.

I'm slowly flattening the second set of schematics gently, should be able to scan those tomorrow.

second set of schematics scanned, I am removing almost all of the wiring back to the relay cabinet. won't apply to me as much now, but figured maybe someone in the repair world might appreciate having a set of cinturn 12 schematics for a 1980 model machine with acramatic 900 controls

drive.google.com/file/d/1BGFrK_5f8lrwg6d..._5T/view?usp=sharing

If you are gonna keep the resolvers, I have a Mesa resolver board with about 80 hours on it, I’ll sell it to ya for $120 and give you a hal file and ini for resolvers to get you started. A 7i49( I think ) needs a 5i23 to hold the resolver software. Keep in mind you will still have an encoder if you have a hand wheel and probably an encoder on the spindle. They could be run thru a parallel port, possibility thru I/o. I’m sure there are folks on the forum who have more experience then I in this aspect.