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#16
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Re: Mystery Sprockets
Many wonderful ideals have been expressed here. I, for one, agree with them fully. I also know from first (not FIRST) hand experience that those ideals are not reachable for all teams in all locations. Although I much prefer to teach the "Give a man a fish and feed him for a day. Teach a man to fish and feed him for a lifetime" principle, I think for the sake of the teams that exist outside the "ideal" world I will give an answer to the original question.
Drive sprocket: McMaster part # 6280K371 $8.23 ea. Wheel sprocket: Get it from IFI. IFI-SPROCKET-35A24 $9.99 ea. |
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#17
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Re: Mystery Sprockets
Quote:
The entire reason FIRST gave us the "kitbot" in my understanding is so that the disadvantaged teams would be able to make more than just a box that sat on the floor. They could focus more on arm design than just making something that could move around the field. I dont see how buying a sprocket with holes takes away from the design process. If Dean really wants a FIRST team in every school, and everyone has to do their own broaching or steel drilling, he had better buy a full machine shop for every school, or FIRST needs to allow more "system" style designs. But anyways, sorry Im a bit off topic, although I think the question has already been answered. The IFI sprockets are probably closest. We use McMaster Carr to buy ours and then add broaches or keyholes (at our sponsors place). I think Ben's idea is the best... if you can find a team near you willing to help, or even one that would be willing to overnight parts they did for you, that would probably be the easiest if you dont have the machining resources. |
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#18
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Re: Mystery Sprockets
In the past Team 104 has had no money and only hand tools. That didn't stop us from making adapters for IFI AL sprockets last year for the KOP wheels. We found a LDPE 5/8" cutting board at BED BATH and BEYOND, using 2 hole saws made some donuts. Drew some lines for the spoke slots and cut with a hack saw with 3 blades on it. Problem solved for about 8$. 2 sets from IFI would have cost 44$. The IFI AL sprockets were 1/2 the cost of the custom steel sprockets and less than half the weight. Some times your have to practice the fine art of kluging. In past years I submit that Team 104 has been the King of Kludge. There should be an award for the cheapest kludged bot that places highest in the rankings.
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#19
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Re: Mystery Sprockets
Quote:
I don't know, Team 306 might give you a run for your money ![]() ![]() Team 306 was staying at a mission building in downtown Pittsburgh for the regional because our mentor's friend was looking forward to meeting us, and it proved to be a cheap alternative to a hotel . Anyway... the 'bot broke, and I had to make a hacksaw out of what the mission house had in its shed, It was interesting. I'd say that is pretty kludge ![]() |
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#20
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Re: Mystery Sprockets
That is so ugly, it's beautiful.
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#21
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Re: Mystery Sprockets
I agree
warning: way off topic - and...I once found an old dog that I could have named Kludge. I didn't know at the time so I named him Farfle, instead...he lived to be somewhere around 25, looked a whole lot like Cody's hacksaw, kinda. |
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#22
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Re: Mystery Sprockets
OK, I concede, you get the McGiver award.
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#23
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Re: Mystery Sprockets
Quote:
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#24
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Re: Mystery Sprockets
Wow, it's nice to see I could come up with a tough question, without even trying
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#25
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Re: Mystery Sprockets
Quote:
http://forums.usfirst.org/showthread.php?t=1834 Quote:
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#26
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Re: Mystery Sprockets
Quote:
What every you do, do not order these from McMaster-Carr unless you have a way to broach in a keyway. Just because the description on their site includes a keyway doesn't mean that is what you get. Mine delivered today without a keyway. Now it is time to do some calling around. Thank goodness this isn't a last minute discovery. Sorry for any problems my advice may have caused. |
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#27
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Re: Mystery Sprockets
Quote:
I just tried the link above and got "you do not have permission to access this page". |
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#28
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Re: Mystery Sprockets
Weird, I got the same message. I saw it just after 9:00 pm.
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#29
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Re: Mystery Sprockets
Also, it seems that what Karthik pasted is directly in contradiction with another Q&A, which asked where to obtain KOP sprockets.
Quote:
http://forums.usfirst.org/showthread.php?t=1508 |
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#30
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Re: Mystery Sprockets
Just a tip we found out today:
When using the IFI sprockets on the kit wheels, make some type of spacer to have the sprocket jut-out a bit. Otherwise the chain will rub against the tread of the tire. The sprockets in the kit have spacers machined into them, and we didn't notice until today when we actually assembled them. |
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