Dragline Rebuild

[modelman]

I have some work done on the swing assembly. I got the holes drilled and reamed so that is the critical part. I still have a little milling to do on the plates and another set-up on the other-6-bushings.-

I probably didn't save any work by using the square drive parts. I tried running the square shafts in nylon and brass bushings but the drag was way to much and caused the motor to lag and draw to much current. I had to get a 4-jaw chuck and turn round ends on the .125" shafts and now they work really smooth. This is the gears I have to pack into these frames to get the pinion speed down to 9-RPM.-

I am still waiting on the pinion and swing gear and also a 1/4" shaft for the pinion. I'm getting closer.

[Rvjimd]

That is a bunch of gears, huh? I'm sure you have already considered a low rpm gear motor? Going to be cool getting all those gears turning!

Jim

[modelman]

Originally Posted by Rvjimd

That is a bunch of gears, huh? I'm sure you have already considered a low rpm gear motor? Going to be cool getting all those gears turning!

Jim

Your right jim-it took awhile to work this out but I think I got it. Here is a couple of pictures showing all the gears in place-



The 1/4" bushing is for the pinion shaft and that will be another reduction. I would consider this a low rpm motor -5000 rpm-12v. but a gear-motor will not work. It would start & stop instantly and that would cause the bucket to swing side to side. That is why I use a flywheel. It starts slowly and smoothly and does the same when stopping. I probably would not need the flywheel with an electronic speed controller but for now this will work.