Hey Lee, I found a 12 volt power supply in my shop. A few years back I replaced the "converter/charger" in my old 5th wheel trailer. It puts out 12 volts DC @ 50 amps total max. That should power the Z if I do get a 727. LOL...
Very nice job Lee. I just wanted to mention one thing. Some of those Bodine gear motors are sensitive to mounting position. Make sure the gears are getting adequate contact with the gear lube. (but you probably already knew that !)
After I got my new lathe up and running I made a coupler and installed a geared power window motor for the Z Lift. The power window motor needs a few more pounds of torque to raise the head. No problems lowering it.
Lee any idea what the torque specs are for that motor?
I follow most of the threads here, and feel that I may be able to add something to this one.
A few years ago, while still living in Alaska, I acquired a Green Mill. It was close in size to the PM932. It did not have powered Z axis. I soon tired of that game, & decided to fix it. So, I started an extensive search for suitable "stuff" to create a lifting device for it. I eventually stumbled onto Burden Surplus Center--- http://www.surpluscenter.com/. Next, I spent a lot of time studying their selection of gear motors. I finally settled on one (no longer listed on their site) that operated on 230VAC. Unfortunately, I cannot remember the specs (torque & RPM) for it. I believe it cost about $79 + shipping to Alaska. I also purchased a "Lovejoy type) coupling. As you can see in the included pics, it is pretty beefy. It lifted the head with no problems. If I were to guess, I would estimate 4-6 inches per minute--not smoking fast. Being that it was 230 volts, I just wired it in from the line-in side of the VFD. I placed an up/down switch next to the VFD, & it served me very well till I sold it & moved out of Alaska.
Hopefully the pics & link to Burden will be of some value to you.
I'm using a Ford Windstar (or whatever) wiper motor, 12 volt coupled to the head crank shaft, at the top of the column to raise and lower the head. No problems, the motor never gets hot, but it only runs a bit at a time.
Hello gang. I wish to add a power lift for my "about to be delivered PM727 w/DRO". (Hopefully Monday ). I would like to know the specs of a successful conversion. Perhaps RPM/ torque specs??? Is there a specific wiper motor that gets the job done??? I see wiper motors are very reasonable on Fleabay, just wondering if they have enough umph and whether they are happy turning in reverse.
Thank you in advance
Robert in Milwaukee
hey jer, thanks for the response. (yep, I should of stated 115v or 12v). looking at the specs of your linked gear-motor...its rated at 28rpm. is 28 sufficient??? I don't have the mill in front of me (as its now sitting in a Milwaukee shipping terminal. yaaaaa!), but I was guessing 75-100ish rpm was necessary. thoughts please.
I think it might be a bit slow, but that lends it to more power for the lift and slow to be able to fine adjust--if necessary. The one I had in Alaska was also slow, but unless in a hurry, it worked very well.
This is the motor I used. A few things I don't like about it.. even at 100 RPM it is still too slow for my liking. Second it draws a lot of current (16A), which was not a problem for me as I had a supply available, but I had to use a bigger supply than I wanted to. Also it works but could have a bit more torque... a 10 N-M motor would be better.
It does work well. But it doesn't need the good controller as i just run it at max speed. I think a gear ratio of 100: 1 for direct drive would be ideal. But i had this stuff laying around, so the price was right.