Easy Bevel Gears Arrangement With Online Calculator
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SPGears by Mark Jason Grundman & online calculator http://www.daycounter.com/Calculators/Bevel-Gear-Calculator.phtml and it's easy to arrange bevel gears with different ratios in SketchUp (for gearbox design etc). Close holes in the gears with NetFabb and 3D printing is ok.
Edit: Added video testing gears with SketchyPhysics.
Also one nice calculator: http://www.hercus.com.au/uploads/29161/ufiles/Gear_Calculations_rev3.xls
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