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By: KohKohPuffs
New: 02-07-2016 21:13
Updated: 02-07-2016 21:13
Views: 1124 times
One of my older gearboxes I made a few months ago. This is... the 5th inverted I made? Anyways, the main difference between the other ones is the shifting system: this time I'm using two smaller pistons to push against a plate, which moves the rod (unfinished, but should be where the small bearing on that plate is.).
Speeds work out very decently for a 6in wheel drivetrain, and I'm pretty satisfied with its weight (8.34 lbs). I'm not sure if this two-piston method would be the best way to this; I wanted to make this as compact as possible to allow for everything else inside the frame perimeter, so I thought this design would do that best. In addition, I've seen 254's take at this, but with this design I wanted to find out if there's a different way to approach this.
Thoughts?
Discussion
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02-07-2016 22:57
ratdude747
Re: pic: Inverted Gearbox Concept
Maybe this isn't an issue, but the exposed 1st stage looks like an accident waiting to happen. If it were used one would want to be careful with the chassis design to make sure nothing (wires, etc.) would be in danger of getting nailed.
02-07-2016 23:11
KohKohPuffs
Re: pic: Inverted Gearbox Concept
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Originally Posted by ratdude747
Maybe this isn't an issue, but the exposed 1st stage looks like an accident waiting to happen. If it were used one would want to be careful with the chassis design to make sure nothing (wires, etc.) would be in danger of getting nailed.
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03-07-2016 10:31
ThaddeusMaximus
Re: pic: Inverted Gearbox Concept
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Originally Posted by KohKohPuffs
With every design like this, the first stage will be exposed. Of course, people should be careful about this, but perhaps a case can be made to go over the first stage. I can kind of imagine that happening with a 3d printer.
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04-07-2016 00:23
ratdude747
Re: pic: Inverted Gearbox Concept
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Originally Posted by ThaddeusMaximus
Why spend the time printing something heavy and fragile (and doesn't let you see inside) when you could run a thin sheet plastic shield? I know some teams were using lexan for this but that seems overkill... scrap plastic like out of a 2L bottle seems all that would be necessary here.
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Part of it is my new job as an engineer in an automotive body component plant where I'm always having to take such precautions when designing/modifying machinery. Unguarded pinch points cause me to raise an eyebrow... which maybe isn't bad?
04-07-2016 00:33
cad321
Re: pic: Inverted Gearbox Concept
Out of curiosity, what size gears are you using on your first reduction?
04-07-2016 01:00
mman1506
Re: pic: Inverted Gearbox Concept
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Originally Posted by ratdude747
Maybe this isn't an issue, but the exposed 1st stage looks like an accident waiting to happen. If it were used one would want to be careful with the chassis design to make sure nothing (wires, etc.) would be in danger of getting nailed.
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I wouldn't be worried unless your 1678.
04-07-2016 01:27
GeeTwo
Re: pic: Inverted Gearbox Concept
The outboard placement of the CIMs looks good, but the high CoG is disconcerting. Rotating the whole assembly about 60 degrees about the output shaft (pick your direction) and moving the then-higher CIM closer to the then-lower CIM would result in a much lower center of gravity and a shorter foundation for the manipulators, without much affecting the shift and other capabilities.
04-07-2016 09:34
ratdude747
Re: pic: Inverted Gearbox Concept
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Originally Posted by mman1506
I wouldn't be worried unless your 1678.
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