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Unread 09-22-2003, 08:42 PM
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Unread 09-22-2003, 08:44 PM
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:)

That's a great idea, but would you use it on a robot?
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Unread 09-22-2003, 09:18 PM
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I have to admit I have NEVER seen that combo before.
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Unread 09-22-2003, 09:44 PM
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Tytus,

I deffinatly give you a A+ for creativity.

Some problems that i see, your robot "chassis" is going to be very small, becaus those suspension stuts are going to take up a big chunck of space. also how are you going to rotate each pod? i noticed that each drive module is powered by one shaft out the top. are you going to attach 1 drive motor to run all those pods or are you going to have individual wheel w/ a motor?


Thats a really good idea, run with that
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Unread 09-22-2003, 10:00 PM
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You need for the wheels in each module to be pointing in the same direction to work, obviously. It appears as if you planned on using belting that's common to two or more modules to achieve that.

I hope you've considered timing belt as an option or something else than won't slip. Slipping, over time, will throw off the alignment of your modules relative to one another.

More importantly, I don't understand how that belting is supposed to remain attached to a crab module that's going up and down on a suspension. Perhaps a better explanation of how the belting would interact with the frame and other modules would reveal how this works?
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Unread 09-22-2003, 10:08 PM
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Why do you need a suspension? For more tire contact at all times? Surface area doesn't affect traction.
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Unread 09-22-2003, 10:12 PM
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im thinking of going in the Half-shaft direction instead of the Kevlar for Propultion, the steering could be all linked for simplicity or all indivdual steeper-motors for some crab,Quadrosteer,and other wikid cool tricks. Please Feel free to throw your own ideas in there, it would look kinda like a starfish with 4 points, i know Its dard to Keep track of the scale of things in 3DS-MAX
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Unread 09-22-2003, 10:19 PM
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Quote:
Originally posted by Kevin A
Why do you need a suspension? For more tire contact at all times? Surface area doesn't affect traction.
Yes, it does. Search around CD for a bit and you'll see that we've beaten this into the ground. In fact, there's a whitepaper that shares some experimental results that were ascertained by a SPAM member (or family member, if I recall correctly.)

Don't ignore deformation.
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Unread 09-23-2003, 12:38 AM
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mmkay, here goes:

Originaly posted by you, M:
If your wheel is a smooth surface (i.e., aluminum, two wheel chair wheels), double the area will do nothing to aid your traction at all. It will increase by a factor of 1.

So you are saying that on a smooth regular surface, the surface area doesn't matter.

Ok, so how about an irregular surface where the tire and and surface can intermesh, say on carpet?

From the whitepaper,: When the surface area went down the friction increased

Wait, is this saying that not only did the traction not go down, it went up?

Hmmm....
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Unread 09-23-2003, 12:43 AM
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Quote:
Originally posted by Kevin A
From the whitepaper,: When the surface area went down the friction increased

Wait, is this saying that not only did the traction not go down, it went up?
I'm sorry, but didn't you just establish a correlation between surface area and traction? It seems to me that you did. Never did I say that increasing your surface area increases your traction because that's simply not true in all cases.

However, it can be true and has been true in FIRST in the past. How do I know? I designed a drivetrain that was, apparently, stronger than 250 or so others and it was based entirely on deformation and the meshing of irregular surfaces.
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Unread 09-23-2003, 12:58 AM
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Traction can go both ways with surface area. Rock crawler 4x4s (and sand vehicles) air down their tires for a bigger footprint. More suface area and more traction. But some 4x4 mudders (and snow vehicles) use really skinny tires so they can sink into it and get a bit on what's on the bottom rather than float over on top. I know this isn't really about traction on FIRST robots but it was the first example I could think of. There are just so many variables involved that it really depends on the exact materials and the exact situation.

Traction is such a complex issue that it's really not worth debating about because everyone is right and wrong, just in different ways. There are so many factors involved: tread, interlocking surfaces, surface area, friction, composition of both tractive surfaces, stickyness, softness of both surfaces, gravity, and that's just the beginning of them. Nascars have smooth tires on a very smooth surface but get incredibly good traction. 4x4s have very aggressively treaded tires on very uneven surfaces but get incredibly good traction. There is a different kind of tractive surface that works best for every terrain. And it being the best is only in the eyes of the operator. There are way too many things that make up traction for any one person to be right about what works the best for everyone. Just do what you think works good and let everybody else do what they think works good.

Problem solved.
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Unread 09-23-2003, 07:31 PM
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Very impressive Tytus.

Only downside I see is it's size. If you wanted to put that on a FIRST bot you might want to shrink it down, so that you have more room available for electronics and any other mechanisms.

Keep up the good work
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Unread 09-23-2003, 07:46 PM
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Quote:
Originally posted by Ryan Foley
Very impressive Tytus.

Only downside I see is it's size. If you wanted to put that on a FIRST bot you might want to shrink it down, so that you have more room available for electronics and any other mechanisms.
Its very hard to keep track of scale with 3ds-max its not in measuring units, its in standard numbers with no realitivty
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Unread 09-23-2003, 08:09 PM
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The reason I think it looks big is because I'm imagining a wheel the size of the wheels in the kit as the wheel in your design, which is what, 6 or 8in diameter?

Hopefully you can build one sometime, I'd love to see a bot with that on it.
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Unread 09-23-2003, 08:40 PM
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the skyway wheels are about 9.5 inches in diamater, I know itS WAY off scale
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