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This uses the spreadsheet from http://www.thingiverse.com/thing:7881 as a design table for a Solidworks part. Tested from 3 to 100 teeth at pressure angles of 14.5, 20 and 25deg. Currently only does straight spur gears, but it's really easy in Sldwrks to make an internal or helical gear.
I realize only a minority of people on this site use Solidworks. I use it a lot, and I'm all that matters in the end :)
Open the part and edit the design table where you can change the module, number of teeth, pressure angle and profile offset (first 4 properties in the table). You can mess with more properties (addendum, dedendum, etc.) in the 'Calc' tab in the design table.
Solidworks Gear Generator by msruggles is licensed under the GNU - GPL license.
So what's this mean?
We're sure msruggles would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!