Cincinnati Lathe-new project

Ive had this Cincinnati for about 7 years,of which it ran for about 45 minutes!! A few years ago I put a Delta Tau windows control on it ,shortly thereafter the Siemens axis drive stating acting up.The machine was parked for two years.




I fixed the drives last week and decided the DT was more trouble then it was worth. The machine is very similar to another lathe I did with Emc,so I ordered a 5i25 and 7i77 and its gettn Emc'd. Its a modern machine so its really plug into the existing wiring.

Nice lathe ! I look forward to more posts with the details of your retrofit. The info would be helpfull to many I am sure.

Thank you,Ill post pics and some video as I get things up and run'n. I replaced the Siemens spindle drive awhile back and hopefully got the axis drive fixed.The machine uses 25 pin connectors for axis signals,so it is plug and go.The i/o was wired to opto racks(originally to the acramatic plc), it is being replaced with a 7i77 and a 16 space opto rack for out puts.The turret plc is already written,this machine is very similar to my Hardinge,so most of the work was done.
I ordered a 7i84 for the operator panel(which isnt in the pic). As soon as it does something ,Ill post it!!

On this lathe I used a Hitachi SJ300, 20 hp model. Hitachi doesnt make the SJ300 any more,they make an SJ700 (which can be run in vector flux mode)and a WJ200. The WJ is a neat drive,I recently put one in my Fadal with a permanent magnet Fanuc motor. It will run either induction or Pm motors. With the encoder card,you can have feedback to the drive( not on pm motors though). According to Hitachi,it has 150 % torque at 5 hz!!. I got it thru Ebay,7.5 hp model,about $700. I had to add an external braking resistor,as the regen from the motor gave me a MAJOR overvoltage alarm on decel. They are definately worth checking out. Your BP has a yaskawa drive? Check the caps in the DC link and on the main board,notorious trouble makers....

interesting retrofit seems to be afew poping up

do you guys know what the max RPM in vector you can do,?

as the vector drive i have has a max speed when worked out to be 4000rpm,
which does not help when your spindle motor does 8000rpm

not sure on the Uni drive from CT
but if your friend andy is getting 6000rpm in Vector mode that sounds good option. as i know motor in CHNC 1 at least is 5.5KW and 6000rpm , (5000rpm max on head stock due to gearing)

rob

Here is the wj200 manual for any one interested. This drive will run an induction motor to top speed with full torque and with encoder feedback. Also runs synchronous ac motors(think giant stepper).


I tried to make it an attachment,but it seems it is too, large. Email me if you would like it. I thnk it is also online.