I decided to finally have a look at all these nice looking camera bodies I've been buying. Sure enough, motor problems abounded. So it seemed like a good weekend to get my hands greasy, and I learned a lot of things along the way:
-- I've been trying all these space-age lubes so the motors would run when cold...but with those, they don't run right when warm! This is 1900's technology, it appears what it requires is GREASE. Something slick that will stay put. I pulled out a similarly-low-tech grease I have called Phonolube (for turntables) which actually does claim to stay the same viscosity over a wide temperature range, and that perked these motors right up! Even 3-in-one oil was too thin, it's got to be something that sticks and slicks. On a couple of the motors I didn't even bother stripping them down, I just put a dab on all the little axles poking through the bottom plate, then smooshed it in with my finger...then smooshed it in some more while the motor was running...then wiped the excess off the plate. The motor starts running up to speed but there will likely still be a HOWLLLL at top speed. In all cases that was fixed by smooshing the Phonolube in around the TOP spindle/plate interface of the second gear in the train (the one right next to the governor.) Its spindle pokes through right next to the governor frame mounted to the top plate, which you can easily reach from inside the camera box once you remove the governor cover. No more howl. Full speed ahead! (Howl would definitely translate into banding too, so one fewer of the myriad of causes for that now.)
-- A note about "full speed" - all 3 of the motors I played with this weekend run almost perfectly identically slow. About 1/9.5-1/10 when set to 1/12, and about 1/1.5-1/1.75 when set to 1/2. But that is only when assembled with the governor speed control in place. When allowed to run free, with the governor unconstrained, they'll run up to about 1/13.5. So the problem is the governor stop leather thingy effectively sitting a bit too low, but there isn't that kind of fine adjustment on the gear for the governor pawl, so it must be a change in the shape or texture of the leather thingy over time. I suspect I could either replace it, or file it down a bit or something to pull all these things up to the right speed, but you have to pull the entire motor out to re-insert that pawl (I tried for an hour to do it inside the camera, it's just not possible in that confined space) and I was tired of having my hands greasy, so an experiment for some other day (or month, or year, or person!)
-- When pulling the motor, you don't have to pull the set screw at the top of the spring housing that connects it to the rod inside the takeup reel. That's very tricky to get back in again through the slot in the takeup reel. Instead, just pull the knobs off the top and pull the motor complete with foot long skinny shaft sticking up from the spring housing! Then you can remove and reinsert that fiddly setscrew easily. Just be careful not to break the shaft off or bend it while removing it or reinserting it because you could put a lot of leverage on that skinny shaft if you're not careful. I had one shaft that, despite being in a camera that looked nice and clean, had a LOT of surface rust on the middle portion of the shaft that is hidden inside the takeup reel, preventing it from sliding through the bushings. So I had to take it off the spring to get the motor out, then work it in and out with careful application of oil along the way, using the in and out motions with the oil to slowly carve off the surface rust - then once it was out I could clean it up properly.
No, I still can't shoot proper tests with these. My 220 adapter was causing too many problems, and I'm still working on the darkroom which will allow me to handle full sized film. And yes I should go work on that instead of fiddling with these, but I was getting tired of them just sitting there uninvestigated. I'm starting to install the heater in the garage this weekend, now that I have the permit and all the parts. THEN I can legally install plumbing in the garage. THEN I can build the darkroom. It's a process.
Duncan