15 tooth + double sprockets

Does anyone know where I can find #35 double sprockets greater than 15 tooth? I've searched for a while on Google, but haven't been able to find them. Andymark only has 15 tooth ones max.

Thanks!

[Mrpalmere]

You can try mcmaster.com, they show a double strand sprocket up to 20 tooth. You may hex broach the sprockets and put them on a live axel. Use hex shaft and turn down the ends to fit your bearing. I'm sorry if you don't have the facility to do this. send me a message and I'll help you with it as I have the tools ready for your use. mrpalmere@verizon.net

Thanks all! I looked on McMaster and the only double sprockets they had weren't like the ones in the kit of parts, or at least didn't look like them. The one in the kit of parts is essentially the one we need, however we'd prefer a larger sprocket than what Andymark offers. Plus, a key broach is sorta what we're going for.

[Ninja_Bait]

Double strand is not the same as double sprocket. Double strand is meant for 35-2 chain, unlike the AndyMark-type double sprocket, which is meant for two separate loops of 35-1 chain. I don't think you can use the former as a substitute for the latter, because the separation between sprockets is too tight.

Originally Posted by Ninja_Bait

Double strand is not the same as double sprocket. Double strand is meant for 35-2 chain, unlike the AndyMark-type double sprocket, which is meant for two separate loops of 35-1 chain. I don't think you can use the former as a substitute for the latter, because the separation between sprockets is too tight.

Yeah. Sorry for not clarifying. I need to know where I can get a +15 tooth double sprocket, not a double strand. My bad for not being clear.

[Ninja_Bait]

Originally Posted by SuperNerd256

Yeah. Sorry for not clarifying. I need to know where I can get a +22 tooth double sprocket, not a double strand. My bad for not being clear.

It's less a clarity issue than an availability issue. Most (probably almost all) "double sprockets" are made for double strand chain, so even I slipped up on that point from my initial Google search. Alas.

Back to the search engine!

Alternatively, make your own by bolting two sprockets together (actually, that sounds kind of fishy engineering to me...) or machine it.

Originally Posted by Ninja_Bait

Alternatively, make your own by bolting two sprockets together (actually, that sounds kind of fishy engineering to me...) or machine it.

We're not very good in machining sprockets, and the build season isn't a time to try it out for the first time.

[Joe G.]

I do think double sprockets will be hard to find, especially if you want them in aluminum like the andymark ones.

Originally Posted by Ninja_Bait

Alternatively, make your own by bolting two sprockets together (actually, that sounds kind of fishy engineering to me...) or machine it.

Although a machined double sprocket would probably be inherently stronger, I don't see why bolting sprockets together would be "fishy engineering." If the bolts are properly sized, there's no reason for them to fail. Bolts are used to transfer rotation between two parts on dead axles all the time, so why not between two sprockets?

Alternatively, you could simply use two broached sprockets, mounted back-to-back on the same shaft.

[Dad1279]

It's a little more expensive, but you can use 2 AM sprockets & a hub, bolted together. For example, 22 tooth use 2 AM S35-22 & 1 AM0096

Edit: posts above while I was writing. I wouldn't call it "fishy engineering", multiple sprockets are bolted together often, for example, many 6 or 8 wd drivetrains have multiple sprockets bolted to wheels to power adjacent axles.

[Ninja_Bait]

I just try to be wary of slapped-together, poorly thought-through, solutions, and that was very much a spur of the moment idea.

[Scott L.]

http://www.3dcontentcentral.net/3DCo...aspx?id=290003

you could assmble 2 of these together on the same shaft maybe?

[Madison]

Originally Posted by SuperNerd256

Yeah. Sorry for not clarifying. I need to know where I can get a +15 tooth double sprocket, not a double strand. My bad for not being clear.

You can't; it's not really a thing that's used often in industry in my experience.

[Fe_Will]

Are you looking for something like this?

[lemiant]

Bolting two sprockets together is popular and I have used it without any problems. Any pair of AM sprockets, properly sized bolts, and spacers (possibly the AM Delrin) should be fine. If you want something proven try these:

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

Originally Posted by Fe_Will

Are you looking for something like this?

I think you may have solved all of my problems! Thanks!