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Picture of @TechShop MP: How to design helical cut gears in Autodesk Inventor
People often need to design helical gears and Autodesk Inventor makes it easy to do. What I like most about this is you don't need to make gears, you can twist all kinds of shapes.

Step 1: Create a new sketch in Inventor

Picture of Create a new sketch in Inventor
1-2.jpg
Select Create New 2D Sketch and select a plane to sketch on