We Can Figure This Out.org
Virtual Lab: Scanning Tunneling Microscope (STM)
 University of Virginia
             
 
© 2003-Present, John C. Bean
 
The final Y-drive arm should come in from below. But instead, in order to make use of a single compact circuit board, it comes in diagonally from the side.

But then, to allow this diagonal arm to stretch as the earlier drives push it left-to-right and front-to-back, this arm attaches to a crossbar. This crossbar (created by a slot in the circuit board) can flex providing the necessary stretching motion.

 
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