when documenting historical machinery in 3D). The approach I gave above is probably as good as any, and has the advantage that you can control the outside diameter, if that is important (e.g. To see this effect more easily, try the helical gear calculator at Engineer’s Edge. With the FreeCAD add-in and on Rush Gears models, pitch diameter stays constant as you alter the helix angle, but the outside diameter does not: it decreases with increasing helix angle. This approach too requires you input either normal module or normal diametral pitch (not transverse). It does well other than that.Īlternatively, I found that Rush Gears lets you make custom helical gears and download them as STP files, etc. Initially I was confused that it gave an unexpected pitch diameter on the finished gear, but eventually realised you must keep in mind, it is asking for the normal module rather than the tranverse module. I tried FreeCAD, or more specifically loaded the FCGear Workbench add-on and tried that.
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