Okay, drive details. The full lathe with its ugly headstock tray:
The two motors. I’ll add an open belt spindle brake someday, but it’s a low priority. The bike brake has plenty of strength to lock the spindle when changing chucks. The waterjet aluminum plates below the brake are just to shim it into alignment because the mount wasn’t quite right the first time:
The VFD visible thru the front door. The plugs go to the motors. In the back behind those plugs is the box to convert the VFD analog output from 0-10V to 0-28V. Braking resistors below the VFD, very carefully mounted:
Under the cover at the back of the headstock. Note my open belt shifter dog is something I made from scrap cast iron to replace the original, worn out unit (the lathe had been run in some stupid ways before I got it and had drive problems). The microswitch to sense gearbox state is behind this custom dog. Also if you ever want to make custom end gears for the rivett, they’re 16dp 20deg PA, noted in this photo: the splines are a pain:
Showing more detail on the microswitch. The aluminum block between the headstock casting and shifter dog is something I added to carry the microswitch. The microswitch is actuated by an adjustable setscrew in the shifter dog. (Second photo is looking forward from the back of the lathe, headstock is at left).
Anyways I hope this is interesting to some. Maybe I should’ve just made my own thread, but this project was like 5yrs ago so I kindof stopped thinking about it since the lathe just works.
On edit: I forgot to snap a photo of the controls but you can see them in the first photo. The top switch is FWD/REV, the second down is the speed potentiometer, 3 is E-stop (triggers e-stop on VFD), 4 is an intermittent jog FWD/REV switch (useful for threading and power tapping), and 5 is unused, but used to be the open belt/back gear selector switch before I wired in the microswitch for automating this shifting. It’s kindof satisfying to hear the clunk of the contractor shift every time you shift the gearbox.
I didn’t snap a photo of the controls cabinet because if memory serves it’s a little uglier than I would like it to be, and there’s nothing special going on other than some changes to the wiring. I reused as much of the original control relays as possible, which was surprisingly easy. The ELSR function works like normal, and has been a pleasure to use on this.