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.
Modeling in Fusion 360:
|Design Process in Fusion 360|
|Sketch of sprocket tooth. Dimensions are for a 19T cog.|