So far this is going very well. I just need a good way to disengage.
I'm thinking a 12 point socket on some kind of sliding sleeve.
Anyone have any suggestions?
Mill the motor spindle to 1/2" square, slip on a deep socket, on the feedscrew one short nut to lock, one long (coupling?) nut for the socket to slide over to engage?
Very intriguing project. You have my attention. I like Dave's idea. I wonder if you could use something like a love joy connection, that slides back and forth?
Martin
Some progress, sort of.
I milled the wiper arm that attaches to the shaft into a 21mm hex and sacrificed the hand wheel because I didn't want make something to replace it.
So here's where I am.
Staring at it and waiting for a good idea...
Thanks KD. Some good stuff in that video!I may be going for a more red-neck solution than Lee.
I think for now I've settled on a solution.
I turned down the hand wheel to 20mm and decided against the nut/socket in favor of a 12mm to 20mm 66mm long flexible coupling (thanks Martin) that I'll just loosen with the set screw when I need to go manual.
The motor has three speeds and with the speed control I got, I'll be able to go from barely turning to faster than I'll ever use. So I don't know how often I'll want to go manual.
I also have stop/limit switches that I'm going to attach to the front slot somehow.
No progress until the coupler arrives from China.
I used a 12pt deep socket for my power feed. The motor has a 12t gear and a 3/4" socket fit perfectly. I took some 3/4" hex stock and pined it to the lead screw, cut the square drive from the socket, pressed a disc onto the middle of the socket and used that to manipulate the socket back and forth. I made a quick and dirty nylon forked lever to shift the socket. The gear on the motor has a small stub sticking out and I bored a hole in the one side of the hex stock to engage the stub to keep everything aligned.
For a power knee lift that is internal in my bridgeport knee I used a 24 volt pull solenoid to shift the gearbox of a 1/2 inch cordless drill. I didn't need the high speed side so I ground the gear teeth off on that side and that became neutral. A spring pulls it to the neutral side.
When the power is on for the motor to run the solenoid pulls the gearbox into gear and I can raise and lower the knee with a reversing switch. If I need to move the knee manually it can be done when the power supply is switched off.
It would take some doing but one of those little gearboxes could be installed between your motor and shaft.
I think that you will want to go to manual whenever you are positioning to a gnat's eyebrow. Sneaking up on that last half thousandth with a power feed will be tricky. If you overshoot, you will have to back up to remove the lash and have another go it. Changing from power feed to manual feed by loosening a set screw will get old really fast.
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