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a few of us 229ers have been talking about a new wheel design, allowing the chain to run between the tread so i modeled this up quickly, not sure about bearings, or exact spacing yet, but you get the idea.
Discussion
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12-02-2007 10:33 PM
Lil' Lavery
Re: pic: Wheel Design Idea
What benefit do you get from running the chain between the treads?
What difference would this be from just having two wheels on either side of a sprocket?
12-02-2007 10:41 PM
Mike Schroeder
Re: pic: Wheel Design Idea
1923 did this in 2006 i don't know what benefit it would be but it looked really cool 
12-02-2007 11:13 PM
Akash Rastogi
Re: pic: Wheel Design Idea
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Originally Posted by Lil' Lavery
What benefit do you get from running the chain between the treads?
What difference would this be from just having two wheels on either side of a sprocket? |
What's the reasoning behind it btw?
12-02-2007 11:17 PM
Re: pic: Wheel Design Idea
It would help a lot for tensioning, as some shaft mounting setups can be skewed from the force of tensioning. This would be wonderful as a double sprocket for the middle wheel of a 6 wheel system... I might yoink the design a little bit in the future...
12-02-2007 11:32 PM
jwfoss
Re: pic: Wheel Design Idea
the ideas behind it were: to save space, center the load on the axles, as well as look cool of coarse... notice that the bolt pattern is the same as the andymark and ifi stuff for easy of assembly.
lil'lavery: its the same as two wheels on either side of the sprocket, just custom
114manuallabor: this is going to be used for a six wheel drive system, the center wheel will be driven by the gearbox, then all the wheels will be connected by one chain in the center. at least thats the idea behind it
12-02-2007 11:38 PM
Akash Rastogi
Re: pic: Wheel Design Idea
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Originally Posted by jwfoss
the ideas behind it were: to save space, center the load on the axles, as well as look cool of coarse... notice that the bolt pattern is the same as the andymark and ifi stuff for easy of assembly.
lil'lavery: its the same as two wheels on either side of the sprocket, just custom 114manuallabor: this is going to be used for a six wheel drive system, the center wheel will be driven by the gearbox, then all the wheels will be connected by one chain in the center. at least thats the idea behind it |
12-02-2007 11:41 PM
techtiger1
Re: pic: Wheel Design Idea
I like it 1251 did something similar in 06 with our modified 6wd drive system. This method makes certain things alot easier and should would out well for you guys good luck with it. I am sure what ever you put out it will proform as is custom from 229.
-Drew
12-02-2007 11:41 PM
Lil' Lavery
Re: pic: Wheel Design Idea
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Originally Posted by 114ManualLabor
It would help a lot for tensioning, as some shaft mounting setups can be skewed from the force of tensioning. This would be wonderful as a double sprocket for the middle wheel of a 6 wheel system... I might yoink the design a little bit in the future...
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12-03-2007 12:04 AM
Madison
Re: pic: Wheel Design Idea
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Originally Posted by Lil' Lavery
Why have the chain in between the wheels though? If I understand what you're saying, wouldn't any wheel-mounted sprocket achieve the same thing?
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Our 2007 robot exhibited this behavior because the bearing blocks were not physically coupled to one another, allowing one to slide further in its slot than the other and creating noticeable toe in. It didn't affect our performance negatively because the involved wheels were omniwheels. Wide high traction wheels with toe will wear unevenly and contribute increased friction into the drivetrain.
Putting the sprocket in the center of the wheels, theoretically, means there's less likelihood of this happening. Your mileage may vary as to whether or not it's worth it. You're increasing the weight of your wheels by duplicating a hub and spokes and I think you can probably find a way of coupling the mounting points of the axle and eliminating toe that way.
12-03-2007 12:10 AM
=Martin=Taylor=
Re: pic: Wheel Design Idea
Cool Idea:
Instead of a chain, why not a belt? Just get a timing belt pulley and stick two traction surfaces on either side of it, essentially keeping the same design you have pictured here. Make the pulley the same size as the wheel. You should be able to do this because with a direct drive system there will be no sprocket reductions between the wheels.
The advantage of such a system will be tremendous when climbing ramps. The timing belt will make constant contact with the ramp preventing you from bottoming-out. It will also have minimum side load when navigating on the carpet - aiding turning ability.
12-03-2007 12:11 AM
Qbranch
Re: pic: Wheel Design Idea
It's really cool looking! But, a word of warning: In 2006 we got knocked out of the finals at cleaveland when we had a sprocket explode and couldn't get it replaced in time since it was buried so deep in the machine.... so, putting your sprocket between two wheels may not be a good idea...
-q
12-03-2007 12:14 AM
jwfoss
Re: pic: Wheel Design Idea
Hachiban VIII, my old team, Aces High 176 did exactly that back during raising the bar, to climb the steps and the sides on the center field, it worked great, literally pulling us up the wall, we did, however have skids under the belt so that it would stay tight and not flex too much, if your interested i am sure theres a picture on their website.
12-07-2007 01:17 AM
Nevets Amstier
Re: pic: Wheel Design Idea
looks cool Foss!
-one comment though, wouldn't it be better to go with the conventional side mounted sprocket (i doubt thats the right word for it), because you'd get more contact with one wide surface instead of 2 skinny surfaces?
can't wait too see how the team will do this year (with some coaching 176 style)
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