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Re: pic: 816's 2011 Off-Season Teaser
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This entire project is heavily influenced by a few factors: -We wanted to try some new construction methods. -We wanted to build a lighter more competitive drive than what we used in 2008. -We wanted to move to an 'assembly' style build method. -The shop foreman at our machine shop told me to design something 'interesting' for his guys to make - one thing lead to another and yeah.... Here are some more pictures for those of you that are interested: ![]() ![]() |
Re: pic: 816's 2011 Off-Season Teaser
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Re: pic: 816's 2011 Off-Season Teaser
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- Sunny G. |
Re: pic: 816's 2011 Off-Season Teaser
We just use two single sprockets. Makes all of our drive sprockets the exact same.
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http://www.andymark.com/SearchResult...ouble+sprocket |
Re: pic: 816's 2011 Off-Season Teaser
Team 2348 has been making our double sprockets for the past 5 seasons for our "West Coast" bicycle chain drive.
As suggested, we should instead just buy them if possible. A lot of time, energy and round stock is used. |
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Ah- yes the mental picture popped into place. Knurling is really REALLY simple (and pretty cool). It could be something you guys experiment with now, especially since you already have the lathe, etc. The gearbox plate looks good. I assume bearings will be pressed into it. I'd be curious to see what results you get as far as the tolerance on the press fit from a waterjet. We've had access to a waterjet for a while, and we use it for a lot of things. One thing I've always been wary about is bearing holes though. We usually will cut out almost the entire part and then go back to correct the bearing holes with a secondary process. -Brando |
Re: pic: 816's 2011 Off-Season Teaser
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The bearings are more of a tight slip fit then a true press. I can get a good measure on the bore when I go to the shop tonight. We have originally intended to ream the holes under the assumption that they'd run under, but they came out of the waterjet just right it seems. Got one of the finished Sprockets: ![]() |
Re: pic: 816's 2011 Off-Season Teaser
We hit some snags with the kids on winter break, so the axles are keeping us from getting this guy running. Here's how we left it before the Holidays:
![]() My lathe guy assured me that our parts would be done by our next meeting, so we'll see if this thing runs before Kick-off. Here's a render of the finished product that I may as well post up since someone (Andrew...) made me talk about it in the EWCP Christmas Cast: ![]() And Brando, to follow up, I had the chance to test the press fit on one of the colson plugs at the machine shop with a few of the guys. Pressed the hub into the colson, clamped the wheel into the vice, then used a Torque Wrench to apply Torque. We found out that I wan't strong enough to apply more than 80 ft-lbs of Torque before stopping. (Interestingly enough, the tread of the wheel started to deform after ~50ft-lbs of TQ or so, pretty sure they'll rarely see more than that during competition.) |
Re: pic: 816's 2011 Off-Season Teaser
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Yeah with those what I assume are polypropylene hubs you can do quite a generous interference fit. I think last year I had a .010" interference and pressed the hubs in with no problems, and never had an issue with slipping them. I imagine you will see similar success. I'm curious about the 10WD tho. Are you guys just playing around with possibilities, or do you feel there is a strategic advantage to the 10WD? Looks slick. -Brando |
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Am I the only one who thinks Dustin's CAD looks like a bug for some reason?:rolleyes: |
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10WD is is to change Drive trains on the fly, we can pull two bolts and make it an 8WD, Four bolts to man a 6WD, so on and so fourth. Should help the kids get a real world understanding of Drive trains. The side note to this is that we'll be using this as a testing rig to see what wheel configurations perform the best and to see if the number of wheels increases and or decreases performance. Should be interesting... |
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So are the center 6 wheels all on the same plane? |
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