Joining 2 sets of sprockets

I’m about to start building a remote control robot and I’m a bit of a newbie. I’ll be using Lynxmotion tracks and I’m wondering if anyone here can help me with something. I need a way to join 2 sets of sprockets so that they turn together.

I’ve included a PDF that shows my basic design. At this stage, I’m just trying to build the main chassis/body and tracks - basically just a base with the ability to move.

The rear wheels will provide drive for both the main tracks and the flipper arm, so I need a way to connect two sets of sprockets and have them turn together. I need to connect the front left 9 link sprocket for the main track to the front left 9 link sprocket for the flipper arm - and then the same on the right side. Is there some sort of spacer or hub connector that will fuse/connect 2 sets of your sprockets so that they turn together? Maybe a way to connect two passive idler hubs together?

Any thoughts or advice would be greatly appreciated.

Thanks,
Chris
robot track design - simple.pdf (186 KB)

That’s a nice looking rover. It’s going to take a custom hub to get what you want. Good luck with the design. I’ll be watching. :slight_smile:

Thanks :smiley:

Hey Chris,

Cool idea! I looked around a bit and I think I might see how you could get two sprockets on one shaft. You could buy yourself:
lynxmotion.com/p-114-universal-hub-6mm-pair.aspx
amazon.com/6mm-Linear-Motion-Shaft-Hardened/dp/B002BBIHPG/ref=sr_1_1?ie=UTF8&qid=1317171407&sr=8-1
amazon.com/CMT-791-023-00-6mm-13mm-Bearing/dp/B000P4LN8O/ref=sr_1_14?s=industrial&ie=UTF8&qid=1317171607&sr=1-14
amazon.com/Climax-Metal-Two-Piece-Clamping-Plating/dp/B0026GUBJQ/ref=sr_1_1?s=industrial&ie=UTF8&qid=1317171652&sr=1-1

So, thats 6mm hubs, 6mm hardened shaft, 6mm ID bearings, and 6mm bore shaft collars. Trapping the bearing will have to be something you figure out, but depending on the material you use for the body you could press fit them. With these you could put the hubs where you need them and use the set screws to hold them. You could use the shaft collars to trap the shaft from the insides of the frames. Oh, and if you can find shafts that aren’t hardened they will be a lot easier to work with. The hardened shaft will be difficult to cut.

Wow, thank you so much for the help and the links! I definitely see what you’re thinking and it’s a great idea. If my biggest problem is figuring out how to hold/mount the bearings, I’ll be quite happy! Thank you again - that honestly helps a lot.

Also, I meant to say that, when and if I get this figured out, I will post design docs and pictures here.

Chris

These may be useful? :blush:

lynxmotion.com/p-229-pillow-block-6mm.aspx

Too funny - I thought the same thing and was just looking at those :wink:

Ha, maybe I should have looked on site first. Those will definitely work better. Sorry for trying to throw your business away, Jim. :smiling_imp: