But not so for strain wave gearing, which is designed to take advantage of a metal gear flexing to achieve an action much like planetary gears. The fun isn’t limited to metal anymore ...

[ZeroBacklash] created a little strain wave gearbox (harmonic drive ... there are 60 teeth on the input side and 62 on the output, giving a gear ratio of 30:1. The flexible spline is deformed ...

Before investing in a strain wave gear or harmonic mount for astrophotography, watch this detailed breakdown of what the specs actually mean and how they affect performance. Anna Wintour ...