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Accurate ring gear tooth profiles
bert_fourie
Member Posts: 102 PRO
I am designing a planetary gearbox making use of double helical gears. The Onshape featurescript and the custom one (Neil Cooke), subtract a helical gear from a blank to make the ring gear. Unfortunately, the tooth profile is therefore not correct. So far, I cannot find a way to fix it, principally because the addendum to dedendum ratios are a fixed set of choices. Can anybody offer advice on this?
Additionally, helical gears are defined by the transverse module, rather than the normal module. I can fix that by typing in the mt in place of the normal module, so that is OK, but it may be worth adding a note in Onshape to draw attention to the difference for unsuspecting users. Preferably, once you select helical shape, it should automatically calculate and use the transverse module.