Re: 15 tooth + double sprockets
 

I don't want to burst your bubble, but all that does is bolt two sprockets together ;)

Re: 15 tooth + double sprockets
 

aww.

Re: 15 tooth + double sprockets
 

I don't know if they offer 15T with that hub. That system does allow for a double sprocket (2x single strand). I know for a fact that Linn-Gear offers the ability to weld an A (hub-less) sprocket and a B (hubbed) sprocket together as well as what ever bore and broach needed. They are open 24/7 and have great turn around times since they not only support manufacturers but our local logging industry, or what's left of it.

Re: 15 tooth + double sprockets
 

Re: 15 tooth + double sprockets
 

I can't tell by the picture if these will work or not. They look like it, however it needs to resemble the one from Andymark and be a key bore. I can't find anything on the page saying so.

If it works, then my problems are solved! :D

Re: 15 tooth + double sprockets
 

http://www.vexrobotics.com/products/...hdwr-dual.html !!!!!!!!!!!!!!!!!!!!!!!!!!

EDIT: Fixed

Re: 15 tooth + double sprockets
 

Error 404: Page not found. :|

Re: 15 tooth + double sprockets
 

Found what you're looking for: http://www.vexrobotics.com/products/...hdwr-dual.html

Looks good, but how far apart are the sprockets spaced? They need to be the same space away from each other as the ones from AndyMark are.

Plus, it's for a CIMple box output shaft, so they'll need to fit there on the key bore and everything.

EDIT: I did the math (Haven't saved the world yet, build hasn't started), and found out that if I use smaller sprockets on the wheels, I can get the preferred speed. So since I also can't find any wheel-mountable sprockets smaller than 22 teeth, does anyone here know of any smaller sprockets that are also wheel-mountable? This should be easier to find then the double sprockets.

Re: 15 tooth + double sprockets
 

Well, saying you want a wheel mountable sprockets is like telling us you want an umbrella with a stick.

As you might have guessed, there are many variables about aforementioned wheel. But, using my excellent literary analysis skills, I'm going to assume you're going to be using AndyMark wheels.

Using 'small' sprockets on the AndyMark wheels can prove a bit challenging. First off, 'small' isn't very specific, but there are a couple of...regions of small.

So, from my knowledge of the Andy Mark Plaction Wheels, you can get away with a #35 chain sprocket of at least a 24 teeth without having to use the 1/4" spacers. If for some reason you need exactly 22 teeth, you're going to need to use the 1/4" space so the chain doesn't hit the wheel hub.

Any smaller than 22 teeth and you're looking at a live axle system. For this, I would recommend using the AndyMark Performance Wheels. From here, you can buy the sprockets which are hubbed with keys or hex from nearly anywhere and just slide them onto the axle.

- Sunny G.

Re: 15 tooth + double sprockets
 

I think he means wheel mounted as opposed to put on a live axle.

Re: 15 tooth + double sprockets
 

As to your original question, the term you want is a "double single sprocket" or "double simplex sprocket". Like these:

• http://www.ustsubaki.com/pdf/sprocke...ble_single.pdf
• http://www.jointway.com/catalog/F.pdf
• http://www.martinsprocket.com/2001/SecEa.pdf#E32
• http://www.gd-chain.com/double-simplex-sprocket.htm
• http://www.duramax.cn/Images/1class/...eSimplex/1.jpg

Unfortunately, most often they seem to be typically available for ANSI #40 roller chain and larger, or British 06 chain (which I doubt would match). (Some are in China, so there's the distribution problem as well.)

There's always custom fabrication—these guys say they can make it—better still, find a sponsor to make it.

(In case you're wondering, these double single sprockets are used in some conveyor systems.)

Re: 15 tooth + double sprockets
 

The wheels (the mounting part, not the tread surface) can also be turned down to a diameter that will allow the chain walls to fit. But you're still limited to 22 teeth because of the size of the bolt circle AndyMark uses. To wheel-mount a smaller sprocket you'd have to make a new bolt circle on the wheel and sprocket somehow.

Re: 15 tooth + double sprockets
 

Ok, here's the clarification:
For my drive, there is a 15-tooth double sprocket on the CIMple box output shaft. That will be connect by #35 chain to the wheels via a 22 tooth sprocket. However, to achieve the speed desired, I will either need to increase the size of the double sprocket, or decrease the size of the sprocket attached to the wheel.

Again, thanks to all of those who have answered so far, I really appreciate it, since I'm mechanically dumb (so far). ;)

Re: 15 tooth + double sprockets
 

Can you just reduce the max speed in code? Or does that cause too much of a loss in torque?

Re: 15 tooth + double sprockets
 

We can, but we're trying to increase the max speed. It's currently at 10.97 fps, however we want to see if we can go higher than that.

ALSO, I have noticed some people saying that by using the 22 tooth sprocket from Andymark, the chain won't fit. Is that because of the wheel, or something else? I'll be using 4" plaction wheels.