Hardinge CHNC retrofit- Another one on the way!

Yes I did mean 7i37, posting at 11:00 pm can be hazardous to your posts, lol. Anyway, both axis drives have ben tested and work well, and I beleive the spindle drive may work, I just cant get the feed hold disabled. If anybody with could take a look at the circuit diagram I posted and give me their 2 cents on whats going on on the feed holds that would be helpfull. If I need to replace any of the servo drives I will be going the route of a full conversion. I have newer yaskawa and panasonic servo drives and motors sitting in my office as I was originally going for a full conversion.

As for the MPG, I dont have any avaliable pins left on the 2 7i37's they are all going to be used for IO, in fact I think I may be short pins if I want the vertical slide and parts chute to function. I think I will need another way to connect the MPG. Do you know if anybody sells a encoder to resolver conversion board? If they did I could feed the mpg into the 7i49 since I have extra pins there.

I do have an extra arduino from a old project, however I think the programming would be over my head.



The motherboard I am using is a industrial variety type and has a parallel port avaliable, it also has a digital IO port with assignable addresses, however now sure how it works, need to play with is more.

here is the mfg link

www.aaeonusa.com/products/details/?item_id=1171

You could also use a resolver as an mpg and save the par port for your spindle encoder. Using a 7i33 for the two encoder inputs and spi i/o is also an option or a 7i33 and an opto 22 pb 24. I belive mesa has a 72 point i/o card that uses spi,it aint real cheap though.

Attached is the motor spec sheet for the electrocraft servo.

I scanned the hiack book,but it is 62 megs and I cant attach it.If you want a copy,email me at This email address is being protected from spambots. You need JavaScript enabled to view it. will make ur life alot easier.

Thanks Andy, I will try that when I can, however I have to admit I have linux cnc installed and have run it a couple times but that’s about it. I am having trouble understanding the file structure of linux, I’m so used to windows, navigating is a little difficult for me right now. I need to play with it more to get a feel for it. Anyway, right now I am still trying to sort out the spindle drive. I purchased a copy of the Ge hi-ak manual and am chasing down a fault signal from the main legs of the servo drive power switching circuit. I think a transistor may be shorted somewhere but that’s just a guess right now. I was really hoping that I wouldn’t have to dive into the boards but that’s the only cheap option I have at this point. Luckily the manual has all the board schematics so tracing the fault is possible with enough patience. While I was waiting for my Hi-ak manual to arrive my Mesa cards showed up. I found a temporary junk enclosure in the back and bolted everything in. I have attached photos of my test rig that I will be using until I get a proper panel pc with operator interface built. The panel will be a 19 inch chi mei monitor with a elo surface acoustic wave touch screen. Not as desirable as a 5 wire resistive but the price was right. The connections to the old control go through 8 panel mounted db25 connectors, I reused the transition panel from the old hardinge cabinet I have. I cut all the wires behind the panel long enough so that I could plug them directly into the mesa cards. This should make things fairly simple because I will have to do very little wiring on the machine itself. Most of the wiring will be inside the operator panel. I think I need to install the mesa software to set the cards up but I am still having trouble figuring out how to install stuff in linux?








Everything looks like a rats nest right now, but should suffice for testing purposes.