Chief Delphi - Mystery Sprockets

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- General Forum (http://www.chiefdelphi.com/forums/forumdisplay.php?f=16)

- - Mystery Sprockets (http://www.chiefdelphi.com/forums/showthread.php?t=52356)

MrForbes

25-01-2007 23:18

Re: Mystery Sprockets

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

http://www.ifirobotics.com/sprockets.shtml

Justin M.

25-01-2007 23:34

Re: Mystery Sprockets

Quote:

Originally Posted by squirrel (Post 565471)

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".

Richard Wallace

26-01-2007 09:58

Re: Mystery Sprockets

Quote:

Originally Posted by jgannon (Post 565369)

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.

Karthik

26-01-2007 15:46

Re: Mystery Sprockets

Quote:

Originally Posted by Richard (Post 565644)

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.

Richard Wallace

26-01-2007 16:51

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.

Salik Syed

26-01-2007 16:53

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.

Richard Wallace

26-01-2007 17:08

Re: Mystery Sprockets

Quote:

Originally Posted by Salik Syed (Post 565859)

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.

Karthik

30-01-2007 00:54

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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