Designing a Singlespeed Cog: Getting to know Fusion 360

-
Printed 19T Singlespeed Cog
Small project modeling single speed bicycle cogs to the ANSI standard. It was a fun project to get more familiar with Fusion 360.




Design:

I didn't have to design a cog from scratch. Its well know that bicycles use an ANSI #40 chain which means 0.5" pitch. Knowing that, I looked in the Machinery's Handbook and found detailed drawings and equations for sprocket design. I really didn't feel like doing all the math by hand so I typed it all into an excel spreadsheet. You can download the spreadsheet here. You can also download the finished stl files from from my account on Thingiverse.com. (https://www.thingiverse.com/thing:2511621)

Dimensioned image of an ANSI sprocket Tooth Form.
Also includes basic measurements for standard sizes.
I converted the measurements to mm for quick reference.

Equations to calculate values shown in the dimensioned image above.

Screenshot of Sprocket Calculator in Excel. Auto-calculates
all values based on  Pitch and Number of teeth.
Red values are ones used in Fusion 360.
Download Link.

Modeling in Fusion 360:

Design Process in Fusion 360

Sketch of sprocket tooth. Dimensions are for a 19T cog.

3D Printed Final Design:


















Comments

Post a Comment

Write a comment here. Let me know what you think...

Popular posts from this blog

Singlespeed & Dinglespeed Gearing

-
Image
Crankset and chainrings ready for dinglespeed install. Singlespeed bikes are great but lack in versatility. Gear them low for climbing up a mountain or gear them high for top speed. You can't have both. I often found myself wishing for a two speed bike. A high speed for riding across town and a low speed for the trails. The trick is having those two speeds without using a chain tensioner or derailleur. The answer was dinglespeed.
Read more

5 Useful 3D Prints for Mountain Biking

-
Image
3D Printed Chain Whip shown in use. 3D Printing has been a hot topic for the last few years. So much of a hot topic that it has found its way into the general consumer market. Many an aspiring maker has one sitting in their office or living room slowly extruding plastic into various shapes. The last part of the sentence, various shapes, is what concerns me a bit. It seems most of what gets printed are decorative trinkets that are generally useless. They sit on a shelf to be admired for a few months and then get discarded for the latest trinket... That's not what I've been printing. I've been designing and printing useful parts with a consumer FDM 3D printer focusing on mountain biking. So, here are five useful/functional prints I designed for my mountain bike.
Read more