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Unread 25-01-2007, 21:37
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Re: Mystery Sprockets

Quote:
Originally Posted by Richard View Post
When did you see this, Karthik?

I just tried the link above and got "you do not have permission to access this page".
Weird, I got the same message. I saw it just after 9:00 pm.
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"Enthusiasm is one of the most powerful engines of success. When you do a thing, do it with all your might. Put your whole soul into it. Stamp it with your own personality. Be active, be energetic, be enthusiastic and faithful and you will accomplish your object. Nothing great was ever achieved without enthusiasm" -- R.W. Emerson
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Unread 25-01-2007, 21:52
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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:
Altenately, you may want to check with some nearby teams and see if they will be using these parts. Many teams choose not to use the Kit Of Parts-supplied drive system, and may have them as spares (note that if you do obtain them from another team, they still must be fully accounted for the in Robot Bill Of Materials).
I don't think I'm reading between the lines here... that definitely would mean to me that you could use additional KOP sprockets, so long as you accounted for them.

http://forums.usfirst.org/showthread.php?t=1508
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Unread 25-01-2007, 22:47
Justin M. Justin M. is offline
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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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Unread 25-01-2007, 23:18
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Re: Mystery Sprockets

The ifi sprockets come with the spacers....aka "sprocket mounting hardware"

http://www.ifirobotics.com/sprockets.shtml
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Unread 25-01-2007, 23:34
Justin M. Justin M. is offline
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Re: Mystery Sprockets

Quote:
Originally Posted by squirrel View Post
The ifi sprockets come with the spacers....aka "sprocket mounting hardware"

http://www.ifirobotics.com/sprockets.shtml
I didnt use them. I used 8-32 nuts and bolts (didn't want to tap the hubs), and the included spacers won't give the sprocket a snug fit (bore is too big). All I did was use screwed on 8-32 bolts as a "spacer".
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Unread 26-01-2007, 09:58
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Re: Mystery Sprockets

Quote:
Originally Posted by jgannon View Post
Also, it seems that what Karthik pasted is directly in contradiction with another Q&A, which asked where to obtain KOP sprockets.

I don't think I'm reading between the lines here... that definitely would mean to me that you could use additional KOP sprockets, so long as you accounted for them.

http://forums.usfirst.org/showthread.php?t=1508
The link Karthik posted earlier (http://forums.usfirst.org/showthread.php?t=1834) is accessible this morning.

I read the one jgannon posted as allowing KoP sprockets obtained from other teams to be used as spares, not as additional parts.
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Unread 26-01-2007, 15:46
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Re: Mystery Sprockets

Quote:
Originally Posted by Richard View Post
The link Karthik posted earlier (http://forums.usfirst.org/showthread.php?t=1834) is accessible this morning.
This is a tough ruling for a lot of rookies to swallow. I know of many kitbot teams who have gotten these kit sprockets from veterans in order to upgrade to 4 or 6 wheel drive. Since there's a good amount of rookies who don't read the Q&A, it's probably a good idea for all those veterans who donated sprockets to remind those who they donated them to, that the sprockets are now not legal for use. I'd hate to see teams show up at the first regional, only to discover that they need to replace 2-4 of their wheel sprockets.
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Unread 26-01-2007, 16:51
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Re: Mystery Sprockets

I agree with Karthik, this is a tough ruling for many teams. Veterans who have donated these parts to other teams should do as he suggests and make sure the word gets out.

As others have suggested, one easy solution for teams that need a quick alternative to additional KoP sprockets is IFI's 35A24 kit (scroll down to Drivetrain Sprocket Specifications) for $9.99.
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Unread 26-01-2007, 16:53
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Re: Mystery Sprockets

Try using Nylon sprockets, we have used them for 2 years, they save on weight and we have yet to break one! They are extremely easy to drill
I wouldn't use them on a keyed shaft (i.e the output) but they work great when bolted to a wheel. Use the hubbed ones though.
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Unread 26-01-2007, 17:08
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Re: Mystery Sprockets

Quote:
Originally Posted by Salik Syed View Post
Try using Nylon sprockets, we have used them for 2 years, they save on weight and we have yet to break one! They are extremely easy to drill
I wouldn't use them on a keyed shaft (i.e the output) but they work great when bolted to a wheel. Use the hubbed ones though.
Like maybe McMaster-Carr p/n 60425K52?
Quote:
Originally Posted by McMaster
Nylon Plain-Bore Sprocket for #35 Chain, 3/8" Pitch, 24 Teeth, 1/2" min Bore, In stock at $19.24 Each
These are pricy compared to IFI but the assembly will be less complex because you won't need spacers. Also as Salik points out nylon is easy to drill -- you could just clamp on the "kit" sprocket and use it as a guide. And as others have attested, McMaster (almost always) delivers fast.
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since 2003

I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
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Unread 30-01-2007, 00:54
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Re: Mystery Sprockets

http://forums.usfirst.org/showthread.php?t=2341

Here's great ruling for teams.

Quote:
Originally Posted by Official Q&A
We acknowledge that we gave conflicting Q&A answers regarding the wheel sprockets. These sprockets were custom made for FIRST, are not COTS items, and additional quantities would not normally be available. Therefore, additional sprockets obtained from other teams would not normally be permitted. However, considering the conflicting statements, we will allow more than two kit sprockets on robots, provided they are accounted for per the manual (use a price of $10 per sprocket).
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:: Karthik Kanagasabapathy ::
"Enthusiasm is one of the most powerful engines of success. When you do a thing, do it with all your might. Put your whole soul into it. Stamp it with your own personality. Be active, be energetic, be enthusiastic and faithful and you will accomplish your object. Nothing great was ever achieved without enthusiasm" -- R.W. Emerson
My TEDx Talk - The Subtle Secrets of Success
Full disclosure: I work for IFI and VEX Robotics, and am the Chairman of the VEX Robotics and VEX IQ Game Design Committees
.
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