Backlash, torsion, and transmission error can all contribute to lost motion in a drive system that includes mechanical components. But this doesn’t mean you should eliminate these components, as the mechanical advantages of their use are signicant. They just need to be monitored, analyzed and controlled. A customer came to us with a problem that looked to include lost motion as one of the symptoms. This customer produced a line of packaging assembly machines, one series of which put tops on containers. Their typical drive design wasn’t working on a customized machine they had made and they weren’t sure why. The dierence in this container from others was that it had a much tighter tting top than they had previously had to deal with. This meant that not only was the tting tolerance much

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