9-pin sprocket for bicycle chain
Description
Second version looks like it'll work well.
Instructions
Recommend using 9_pin_stepper_sprocket_final.stl - that one worked.
Using a raft helped keep it perfectly flat. As soon as the printing is done, insert the stepper motor shaft and level it, then hold still while it cools. This makes it fit snugly and keeps it straight so it'll actually be usable.
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@devellison
Great idea is the chain for a 3D printer? Does the chain cause any chatter or backlash?
I'd like to see the video. Do you have one for normal people?
Thanks
Should be able to click the 3D button in YouTube near the bottom-right corner of the video and turn it off, so it'll show normally in 2D. Works for me, but the whole youtube 3D thing is still pretty much beta.
Using the chain to move a wheeled platform linearly as part of a custom computer rig. I'd expect it to be way too rough for small CNC-type motion, at least the way I'm setting things up. But it's really cheap when you want to move something 4 or 5 feet and it's already got wheels and a channel.
Video of the build in 3D here: http://youtu.be/Wp46zxQX48o
Need to tune the bot a bit ;)
Second try still required a bit of shaving to match well - going to reduce thickness more and make the teeth a bit slimmer.
Yep, 1/2" x 1/8" single speed chain. Don't have a convenient bike store nearby, and experimenting. I forgot to add an extension for a lock screw for my stepper, and the sprocket is just a *tad* thick on some teeth, but not on others - going to thin it down a tiny bit in the next version.
Wouldn't put it on a bike, but hoping it works for very lightweight robotics...
Hmm... printable jockey and idlers... is that a 1/8 inch single speed chain?
License
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Just curious ... have you tried the Parametric sprocket by Aleksejs?
http://www.thingiverse.com/thi...
I did and it worked, but when I tried pulling from that into SketchUp with an importer I found editing it difficult.
I've made a number of mods on mine since the first post - will upload a new file when I've got it really working smoothly (hopefully have time to do that this weekend). My prints aren't dead on with the Cupcake yet, so I had to shrink the height of the sprocket down to about 2mm to reliably mesh,
and I've thinned the spokes a bit. Also added a column for attachment to stepper and some holes to add a separately printed guard. Still got some fiddling for it to be really solid though.