Actually, you only need to draw one of them. Use “UnrollSrf” command on the cylinder to make the “strip of paper”, which will presently be wrapped again around the cylinder.ĭraw onto the “paper strip” the lines of the tooth points at the correct bevel angle. Create your gear profile - the best is Rainer Hessmer’s Involute Spur Gear Builder, or Doug Roger’s standalone app based on the Hessmer algorithm, GearBakery.Įxtrude over this a cylinder equal to the OD of the gear wheel.The bending of the paper to the curvature of the block will develop the helical form from the straight lines.”. He says: “Mark straight diagonal lines, representing the tooth-points, on a strip of paper, and glue this around the face of the prepared block. So here’s the tutorial for making a true helical gear, 2 years late.Ī better way is to use this old patternmaker’s trick to create a true helical gear, inspired by Joseph Horner’s “ Helical Gears: a practical treatise” of 1893. ![]() ![]() Its teeth are not radially symmetric to the rotational axis. What that produces is “straight teeth set on an angle” – which is not a true screw form, as is required. Mitch above suggested a simple twist of one end of a straight-extruded gear with respect to the other would suffice. This one asks if there’s a tutorial for creating a helical gear in Rhino. ![]() It’s my day for reviving ancient threads.
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