The Craftmans Shop > Radio Control Models
Bruder Manitou 2150 - RC conversion
ddmckee54:
Not a lot accomplished on THIS project during the past week.
My home cable modem puked on me sometime Wed. night. The cable repair tech is scheduled for Monday, between 1 and 5PM. This was the earliest I could get scheduled, wonder if I'll get compensated for the time that I've paid for but can't use due to their hardware failure? (Not gonna hold my breath waiting for that to happen.)
Most of my software packages need to phone home to verify the licenses, so until that modem is replaced I'm pretty much screwed. I hope to get the RC receiver patched into the Arduino breadboard and get some more work done on the code for the Nano - time will tell.
Don
WeldingRod:
Are you printing the ring gear for the turntable? How about the bearing system?
I've used geared skewing ring bearings professionally, with a few curses due to me using them for things the manufacturer never intended;-)
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WeldingRod:
Argh. "Slewing" ring bearing.
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ddmckee54:
WeldingRod:
For the gears I'm actually sorta taking the easy way out - maybe.
I ordered an assortment of 0.5 mod plastic "Robot" gears from Fleabay. Or maybe it was Amazon - I don't remember which. The gear assortment came in a variety of nominal bores, 2.0mm, 2.5mm and 3mm - along with a couple of pieces of 2.0mm and 2.5mm shaft stock. I figured that a cheap injection molded gear would probably be better than anything I could print at that size. I started with a 6VDC 100 rpm N20 gearbox and then geared that down so that I should get about 1-2 rpm out of the turret. It's at least a 3 stage reduction, maybe 4, I can't remember - it's a Senior Moment type thing I guess. I have the shell of the gearbox designed and I will be printing that. The gear assortment had a couple of larger gears, 60 and 72 tooth. I'll be using the 72 tooth gear as my final ring drive gear. I have designed and printed the adapter parts the will allow my ring gear to mate up with the modified Bruder turret. This all gets bolted together with M3 button-head bolts - courtesy of my 3D printer repair/modification parts. The model originally had a gear drive steering mechanism that ran down through the turret pivot. I was going to try to use it for the ring gear, but it was just too big. Those gears did wind up in the "I can use this someday" box though.
The ring bearing, well that's kinda the same answer.
This model is made out of nice slippery plastic. It's not styrene since it's not brittle, and I don't think it's ABS since it is somewhat resistant to acetone. (Had to repair a boo-boo with the X-Acto knife while dis-assembling the model.) The model was designed to be turned by a kid - A LOT, and I figured that I'm not going to be slewing it THAT much. Initially I'm just going to use the model's ring bearing as designed by Bruder. If it starts to wear too much, of if there's too much friction for my homebrew gearbox to overcome, then I'll have to come up with a proper ring bearing. One that will work with my ring gear and still accommodate the slip-ring assembly. The slip-ring assembly is about 13-14mm in diameter and its' got 12 circuits that are good for 250mA each.
I'll try to remember to post an update of the 3D PDF either tonight when I get home, or tomorrow.
Don
WeldingRod:
Yeah, gears that small would be a major printing challenge!
Keep us posted!
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