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#1
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pic: VexBot V2
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#2
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Re: pic: VexBot V2
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![]() Dave |
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#3
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Re: pic: VexBot V2
You mentioned building a two speed. I actually don't think it would be that difficult at all. Maybe a little expensive. If you got the pneumatic kit for it, I bet it would be fairly easy to hook up a cylinder to a shaft and have it slide the shaft with the gears on it to make a mesh style shifter. You'd just have to make sure you got two different ratios that have the same number of total teeth between the two meshing gears (same c-c distance). Also, with the relatively slow speeds and loads involved, I bet even those plastic gears could stand up to it.
*Afterthough* Aww heck, now that I think about it, since it is on such a small scale you could probably just use an inexpensive servo and linkage to slide the shaft. QUICK, go buy more gears and frame metal! |
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#4
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Re: pic: VexBot V2
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... A demo video of this robot is coming soon. Stay Tuned. |
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#5
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Re: pic: VexBot V2
[quote=Arefin Bari]There is a way to do it, but not with the parts that is included in 1 vex kit.
QUOTE]What, are you trying to get me to go out and buy one? I was thinking you could just go 36-36 and 12-60 on the gearing. Make the 36-36 shaft slide. But I just remembered, mesh shifters need a wide face gear. Nuts. That means you are right. Because the above arrangement leaves you with only two 12 tooth and two 60 tooth gears left.I bet with an extra set of gears ($13) it could be done. I wonder if the square hole in the gear is consistent with regard to positioning in relation to the teeth. Does anyone know? What I'm getting at is maybe you can just "stack up" a few gears to make a longer gear. Or if you are going for some good customization (presumably non rules compliant) you could just buy some stuff from sdp-si. |
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#6
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Re: pic: VexBot V2
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#8
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Re: pic: VexBot V2
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Awesome job, -- Jaine |
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#9
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Re: pic: VexBot V2
You've really got me interested now. I want to see a shifting Vex bot. Maybe instead of shifting gears, you can shift wheels. I bet you could do that with the parts from one kit. You could maybe slide a gear that either engeages a shaft which a small wheel is on or a shaft which a large wheel is on. For example when the gear is mating with the gear on the large wheel shaft, the small wheel shaft freewheels.
Anyone with a Vex kit willing to try it? I was even thinking of raising and lowering wheels. But you'd have to raise and lower both sets (large and small) which would be hard with one servo. |
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#10
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Re: pic: VexBot V2
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#11
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Re: pic: VexBot V2
You could have a robot with two small wheels and two big wheels and they are geared with the same ratio except when one is engaged, the other is disengaged. All 4 would always be in contact with the ground but yu'd only have 2 wheel drive at any time.
Anyway, I just tried mesh shifting with lego gears and it is flawless. The + shaped holes in the lego gears are extremely consistent with positioning with respect to the teeth. The gears are probably totally molded and it is all the same operation. I don't know if the Vex gears are made that way. Can you confirm or deny if the teeth line up when gears are next to each other? The Lego gears have a good amount of backlash which makes shifting easy; I'm not sure how much Vex gears have. The "gap" in the long gear will not be a problem at all because going over that gap is just like mesh shifting. Now you are really making me want one of these Vex doodads, but although it is an extremely good deal, it is still a good chunk of money. Last edited by sanddrag : 03-07-2005 at 01:33. |
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#12
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Re: pic: VexBot V2
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For the servos, I bet you could do it with one if you keep the two trannies in line. For linkage, I haven't seen all the vex parts but maybe you can use the "wire ties" or "threaded rods" |
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#13
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Re: pic: VexBot V2
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#14
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Re: pic: VexBot V2
Mind if I ask how you are using the limit switch? I see you have it mounted, but to me it appears you dont have it plugged in in your picture.
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#15
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Re: pic: VexBot V2
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