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Virtual pivot 3D Model
The virtual pivot is a monolithic structure that takes advantage of elastic deformation of matter. Under application of a torque, the two pairs of beams deform symmetrically, which ensures an almost pure rotation of the inner stage.
This is called a virtual pivot because the axis of rotation is found at the intersection of the undeformed beams.
Theoretical calculations (strength of materials) and practical application can be found in this publication.
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