Wouldn't spur gears have a tiny variation in mechanical advantage as they go through different stages in where their teeth mesh? Basically the idea is that as the teeth mesh, they have to slide just a tiny amount, probably around 1% of the tooth pitch, but that also means that both gears change their effective diameter by a tiny amount and that effective diameter goes through that change every time a tooth meshes. Theoretically even helical gears would also have the same problem, but it might be much less distinct because the meshing is more gradual.
That being said, would this make spur gears not recommended for high precision instruments? Would even helical gears be good enough?
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