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We just made the Toughbox even smaller! Now why would we do that?
Discussion
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19-01-2010 18:02
craigboez
Re: pic: AndyMark has the Nano; we have the Shuffle!
I was thinking about a Toughbox Shuffle as well, for the purpose of direct driving a 6" Mecanum wheel. Looks like you may be doing something similar? If so I'd be interested in what gear ratio you're expecting to use.
19-01-2010 18:12
mathman05
Re: pic: AndyMark has the Nano; we have the Shuffle!
I'm sure this will be the same gear ratio as the AM Toughboxes. It looks like they're using the same gears, they're just using a different housing.
19-01-2010 18:22
Chris is me
Re: pic: AndyMark has the Nano; we have the Shuffle!
Neat gearbox. What I like about the Nano is that it's narrow and very strong. Like, Battlebots strong. This gearbox seems to be a bit wider in exchange for a narrower box, though one of the gears protudes. It's probably optimized for its intended use, so i'm going to guess mecanum drive.
19-01-2010 19:59
Fe_Will
Re: pic: AndyMark has the Nano; we have the Shuffle!
Why not use a Banebots P80 gear box? It would be smaller, more compact, and more efficient.
19-01-2010 20:30
Chris is me
Re: pic: AndyMark has the Nano; we have the Shuffle!
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Originally Posted by Fe_Will
Why not use a Banebots P80 gear box? It would be smaller, more compact, and more efficient.
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19-01-2010 20:41
craigboez
Re: pic: AndyMark has the Nano; we have the Shuffle!
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Originally Posted by Fe_Will
Why not use a Banebots P80 gear box? It would be smaller, more compact, and more efficient.
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Also, aren't planetary gears less efficient than spur gears? I couldn't find anything too official, but this
website seems to agree.
19-01-2010 20:45
craigboez
Re: pic: AndyMark has the Nano; we have the Shuffle!
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Originally Posted by mathman05
I'm sure this will be the same gear ratio as the AM Toughboxes. It looks like they're using the same gears, they're just using a different housing.
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19-01-2010 21:04
Fe_Will
Re: pic: AndyMark has the Nano; we have the Shuffle!
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Originally Posted by craigboez
Also, aren't planetary gears less efficient than spur gears? I couldn't find anything too official, but this
website seems to agree. |
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Originally Posted by Wikipedia
Advantages of planetary gears over parallel axis gears include high power density, large reduction in a small volume, multiple kinematic combinations, pure torsional reactions, and coaxial shafting. Disadvantages include high bearing loads, inaccessibility, and design complexity. The planetary gearbox arrangement is an engineering design that offers many advantages over traditional gearbox arrangements. One advantage is its unique combination of both compactness and outstanding power transmission efficiencies. A typical efficiency loss in a planetary gearbox arrangement is only 3% per stage. This type of efficiency ensures that a high proportion of the energy being input into the gearbox is multiplied and transmitted into torque, rather than being wasted on mechanical losses inside the gearbox.
Another advantage of the planetary gearbox arrangement is load distribution. Because the load being transmitted is shared between multiple planets, torque capability is greatly increased. The more planets in the system, the greater load ability and the higher the torque density. The planetary gearbox arrangement also creates greater stability (it's a balanced system) and increased rotational stiffness. |
19-01-2010 21:56
JesseK
Re: pic: AndyMark has the Nano; we have the Shuffle!
What I like about the Nano is that you can support the weight of the drive train through it since it's an enclosed box extrusion. This allows for very compact direct-drive designs which are particularly useful for omni and mecanum drive trains. This one looks perfect for an arm though.
19-01-2010 22:30
Mr. Ivey
Re: pic: AndyMark has the Nano; we have the Shuffle!
The Shuffle is an AndyMark ToughBox, but configured differently. This year we are in somewhat of a budget crunch, and Rob was looking for a way to save some money. After going through our shelves of parts and finding a bin full of random gears, and a bin of AM ToughBox cases, we realized we had about 6 ToughBoxes. Not being able to use the full size TB this year we were going for the Nano, but that was an expensive investment this year. So we took some 3/8 lexan, found all the bearings and bits to the original ToughBox systems, and a few hours later we had the Shuffle! Amazingly the prototype we build was all by hand, and it works unsettlingly well for a hand built gear box. Hopefully Rob and the rest of the team will be posting more soon.
Ivey
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