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Unread 05-01-2012, 22:54
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Re: 15 tooth + double sprockets

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Originally Posted by SuperNerd256 View Post
I think you may have solved all of my problems! Thanks!
I don't want to burst your bubble, but all that does is bolt two sprockets together
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Unread 05-01-2012, 22:55
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Re: 15 tooth + double sprockets

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I don't want to burst your bubble, but all that does is bolt two sprockets together
aww.
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Unread 05-01-2012, 23:05
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Re: 15 tooth + double sprockets

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Originally Posted by Madison View Post
I don't want to burst your bubble, but all that does is bolt two sprockets together
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.
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Unread 06-01-2012, 00:18
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Lightbulb Re: 15 tooth + double sprockets

http://challengept.com/flipcatalogue...pageNumber=126
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Unread 06-01-2012, 00:22
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Re: 15 tooth + double sprockets

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Originally Posted by Scott L. View Post
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!
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Unread 06-01-2012, 00:27
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Re: 15 tooth + double sprockets

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

EDIT: Fixed
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Unread 06-01-2012, 00:28
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Re: 15 tooth + double sprockets

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Error 404: Page not found. :|
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Unread 06-01-2012, 00:37
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Re: 15 tooth + double sprockets

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Originally Posted by lemiant View Post
http://www.vexrobotics.com/products/...hdwr-dual.html !!!!!!!!!!!!!!!!!!!!!!!!!!

EDIT: Fixed
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.

Last edited by Andrew Lawrence : 06-01-2012 at 00:40.
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Unread 06-01-2012, 01:31
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Re: 15 tooth + double sprockets

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Originally Posted by SuperNerd256 View Post
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.
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.

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Unread 06-01-2012, 01:37
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Re: 15 tooth + double sprockets

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Originally Posted by ttldomination View Post
Well, saying you want a wheel mountable sprockets is like telling us you want an umbrella with a stick.
I think he means wheel mounted as opposed to put on a live axle.
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Unread 06-01-2012, 03:23
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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: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.)

Last edited by Tristan Lall : 06-01-2012 at 03:26.
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Unread 06-01-2012, 06:41
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Re: 15 tooth + double sprockets

Quote:
Originally Posted by ttldomination View Post
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.
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.
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Unread 06-01-2012, 08:54
Andrew Lawrence
 
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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).
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Unread 06-01-2012, 09:37
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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?
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Unread 06-01-2012, 09:41
Andrew Lawrence
 
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Re: 15 tooth + double sprockets

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Originally Posted by Ninja_Bait View Post
Can you just reduce the max speed in code? Or does that cause too much of a loss in torque?
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.
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