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Hi. You may want to include http://geargenerator.com. Altough it's not a design software is a very neat tool for generatin gear train online.
Basic Gear Mechanisms
PulleyBot: A Pulley Driven Robot
GearBot: A Dual Speed, Gear Driven Bot
3D Modeling and Printing Your Own Shadow Cube
Basic Pulley Mechanisms
Size 327 did not work, but size 224 did - 1 3/4" ID 2" OD. Success!
Yes, I am using your recommended D-Shaft. I glued the shaft to the large drum and replaced the O-Ring with McMaster-Carr size 225 ID 1 7/8" ( the original was size 226 ID 2"). Both sizes have width 1/8". I am happy to report the bot moves about 7-10 cm without getting stuck. Based on your comment, I am going to try a 3/16" width, 1 3/4" ID, 2 1/8 " OD, which is size 327. I'll let you know how it works out. Thanks!
Huh, that's odd - Yea, I would try smaller diameter or thicker (or both) o-rings, and definitely glue the shaft to the large drum. Are you using a D profile shaft?
Thanks printeraction for the Instructable! I plan on using it to teach my students pulley mechanisms. Unfortunately, I can't get it the bot to move forward. I've greased the axles and 3D printed a slightly reduced length of the small drum. I think there are 2 problems. With the motor off, when I rotate the large drum by hand, the O-Ring slips under the large drum so the small drum does not move. Second, the large drum rod shaft often rotates inside the large drum with the motor on. Should I glue the shaft to the large drum? What about a smaller diameter O-Ring? Any suggestions would be most helpful.
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