What are the different mechanisms that allow linear movement(such as VEX linear rails)?
They system doesn’t need to be powered just slide linearly.
4 bars aren’t linear
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The most common form is a elevator lift, also called a linear lift and a cascade lift. The basic principle is connecting your chain to your lift stages so that the stages move up and down with the chain. Here’s a great example from @jpearman:
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Cascade lift
Cascade lift