Is this possible? (Gears and chains)

[Kevin Sevcik]

Okay, followup question to help solve your problem. Mounting depends on how much load will be on the sprocket/gear. If there's a fairly light load on it and it's large enough, I'd just bolt it directly to the plastic coupler for the keyang motor. If it's not that big.... Well you might be able to remove the gear from the keyang and attach your sprocket directly to the shaft of the keyang with an ugly but possibly functional combination of JB Weld, a roll pin, and a hose clamp. Mostly it depends on the particular details of the mechanism.

[Elgin Clock]

http://www.cabaret.co.uk/education/geneva.htm

Good stuff.

Think of your half gear as the Yellow part and your full gear as the blue one.

I would like to see you try that and see if it would actually be effective.

[DonRotolo]

In most cases, you need the full hub (the part surrounding the hole in the middle) of the sprocket to mount it to a shaft. You can also make the hole bigger, or drill holes to bolt the sprocket to something.

In any case, you cannot depend upon friction or an adhesive to prevent the sprocket from spinning on the 'shaft' - you must use a roll pin, or set screw, or square/woodruff key, or some other method.

Considering that, you might just use the whole sprocket. As others have stated, if you really can't afford a sprocket, ask here. Many teams have extras lying around, and will happily share with you.

As maltz1881 stated, success will be getting a robot that passes inspection and can move on the field. Everything after that is gravy.

It's not about the robot - search on that phrase to understand what that means.

Don