Quote:
Originally Posted by RC-Monster Mike
Cool looking tranny. I understand that some people want the gearbox enclosed, but there really is no need to do it - and any lube you think you may put on the gears will fly off regardless of if there is an enclosure or not. One huge advantage of an open gearbox when using the slipperential is the ability to adjust the slipper without taking it all apart to get to the adjustment nut. Another possible advantage I can think of is the occasional situation where the pinion set screw loosens. It can loosen to the point of actually coming out of the pinion - in an open design, it just flies away. In the closed box, it is likely to get into the gear mesh and cause carnage.
Also, I think the prototype will be fine with the rapid prototyping, but the motor has some weight, and there will be a substantial amount of torque on the assembly as the motor generates the needed power - aluminum is probably the best bet for a rigid tranny and sound gear mesh. Looks to be a cool project and I am excited to see it completed. :)
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About the pinion getting loose, generally, the set screw gets loose enought that the pinion doesn't spin with the motor, and then still has to back out quite a few turns before coming loose. I don't see how it would go flying out. ALso, I was going to have holes on the final version for adjustments.
Secondly, I called the shop today, and found out they charge $50 per cubic inch printed, so its much too expensive. Im getting quotes for cnc milling 6061-t6 alum from some other places.
You guys have a lot of custom made stuff, but i wasn't sure if you did machining in house. If you do, let me know, maybe I can get a quote?
EDIT: Also about the lube flying off. I made the circle around the spur only 1 mm from the spur itself, so once could put a bunch of low viscosity lubricant at the bottom , so even if it flies off, it will pick more up at the bottom. Kinda lke the oil pan in a car. I kept assembly in mind as well, so you can add oil without dissassembling it. ALso, if you look at the other thread, you will notice there is a removable cover over the pinion for setting the mesh easily.
I don't like open for bashing because if you are jsut drifting around in dirt i think soem of the rock could damage the gears. I konw there is dirt on the gears on my kershaw gearbox, and even if it doens't shred immediately, it definately wears the gears.