One thing that might be of interest is to make scale cad drawings of track sprockets.They would need to be carefully engineered to actually be workable. The use would be to print out the sprocket drawing, carefully carve out the sprocket pattern on a thin piece of wood. The wood sprocket would then be used to make impressions in modeling clay, which would be filled in with your every day variety of two part epoxy glue and allowed to harden. The sprockets would be of a sizes and thickness of a quarter to silver dollar size. These flat sprockets would then be bonded to hubs for final use. I’ve been trying to make some small sprockets, but getting appropriate taper on the sprocket cogs is some what difficult. Any of the cad gurus up for the challange? 
My stuff is done with Rhino3D and based on 2D autocad drawings from Beth and measuring parts in hand for thickness. I can export the .3DM files in IGES and some other formats, but I don’t get the impression from the solidworks guys at work that they are especially useful. Rhino is more of a surface modeling program than a solid modeling one. If you have prefered file formats PM me your e-mail and a list in order of preference and I’ll export whatever Rhino supports. I’ll send you the files and you can take a look and judge for yourself.
I think you will run into a problem with the slightly angled teeth if you are referring to the lynx tracks. Look carefully and you will see that the teeth are staggered as they go around the hub.
just my .02
nick_a
you could not actually make the sprockets from a single sheet of wood, it would be more like 3 sheets laminated together with the center one having an overlapped area of both of the two outside parts. you might be able to lasercut the sections from the thin r/c aircraft plywood, but then you would also need to do a secondary router operation to put the bevel on the outer tooth edges.
Did anyone ever come up with the 2D or 3D drawings of the sprockets? or at least the dimensions of them
We’ve got a bunch of students who are designing a tracked vehicle and they have decided to use the larger (9 pin) sprockets and 2" tracks.
I’d like them to represent the sprockets and tracks on their drawings as accurately as possible.
Thanks in advance
Hi all,
If you come up with a drawing (DXF) of the sprockets you want, or even a specification such as 1/8" roller, 1" pitch, 24 tooth (??), then I think the sprocket “master” could be CNC cut on a small (Sherline) CNC system.
I can directly input DXF files, and/or if the information is available I can probably generate a Gcode (CNC) file and cut a master from wood or Plexiglas (as I think was mentioned).
I DO NOT know about any shrinkage of molding material (or how to compensate for it in the design), but it could be that a thin layer of tape would give a little build-up, and correct for any shrinkage. It might not even be important.
I’m not interested in the actual MOLDING of sprockets, but I have generated 1/4" sprockets for my robot in the past. Is it a standard part? Is there a sample?
Anyway, if someone is interested, let’s see a drawing!
Alan KM6VV
Ahh, I think they were just asking for a model of the sprockets sold by lynxmotion to support their track system. The 2" track segment is in the model library but nobody has a real solid part in there for the sprocket(s) yet. Rhino3D is more of a surface modeling system than a solid modeling one. Interesting that you have the ability and equipment to spin off prototypes though… no doubt that has some serious down the road cool factor potential. 
Hi Eddie,
OK, I missed that point. It sounded like someone was making a custom sprocket. Yeah, I can see making a few parts for robots (again).
At “work work” we have a Dimension SST 3D printer. I’ve watched the MEs make some neat parts! I haven’t had an occasion to design/make a part on it yet. They’re ABS, and fairly strong, but I don’t believe they’d hold up for too long under a lot of stress. Might make a nice body; 'tho! ;>)
I’d LOVE to be able to make parts for the hexapod! But it is basically sheet metal (OK plastics too), and while I can cut them out just fine, I don’t yet have a sheet metal brake in my shop. The Phoenix of a few threads ago did have a little milled servo bracket; but I only saw support on one end of the servo… that’s the hard part, getting double shafts for (I think) proper support of loads. Figure out a way to “mill” parts for a hexapod, and I’m all over it!
Alan KM6VV
My sprocket interest was independent of the lynxmotion products. I was origionally looking at using strips of plastic carpet runner for the base track material and needed a sprocket to drive it. In my search found that one would have to put a good bit of thought into the track design and the sprocket design to make something that would work well together.
Hi Cat (?),
Yeah, that might take some work. I’ve only worked with defined, off-the-shelf sprockets and chains.
There are some miniature chains and sprockets that might work. Try Small Parts, or something similar. I’ve seen instruments that used 1/8" chain and sprockets. And there is some ABS (?) chain and sprockets products as well. That might be better!
But how to attach the chain to the belt? Maybe pull some of the link pins out, and replace them with LONG ones (across the track) of your own? Just a thought.
Alan KM6VV
EddieB mentioned that he thought the 2" track segment was in the model library, but I can’t find it. Does anyone have a link? The only models I’ve found are located by going to the “Products -> Server Erector Set” page and clicking on the “3-D Models” link.
Yes, the track segment is there. Here’s a link to the exact place on the page.
lynxmotion.com/ViewPage.aspx … del#tracks
there is no picture on it, but it is there. It is right above the BT-03 model in the section labeled Tracks.
I can provide you with usable DXF files exported from 3D models I make. 
I am going to start giving Beth DXF files of all my models, in addition to Alibre, IGES and STEP 214 formats, from now on.
8-Dale
Thank you Beth. I clearly suffer from selective vision deficiency. I looked at that page at least five times before posting my request.
I’m building an Alibre model of the entire tracked base to support a project I’m working on. When I’m happy with what I have, I’ll submit it for inclusion on the site.