#PDF of a #flexure pivot #precision #mechanism #patent from 01996 for detecting gravity gradients to parts-per-trillion precision for Earth surveying. #toread
on 02025-12-11#Cylo #video on #precision #flexure #mechanisms, starting with “wobble pins” connected with “pairs of notch hinges”, and cascading two springs of different stiffness, so you apply a large displacement to the weaker spring, which produces a small force in the “colinearly attached” weaker spring, which then moves a four orders of magnitude smaller distance. From Smith and Chetwynd. He proposes the “diving board” flexure, where a force on the end of a cantilevered beam produces a small displacement on the opposite side of its fulcrum, the beam being pinned at its end to form the cantilever support with the fulcrum, the displacement ratio being (16/3)L₂(L₂ + L₁)/L₁², thus asymptotically proportional to the ratio of the squares of the lengths, enabling a large transmission ratio in a small package. His realization uses a cross-leaf flexure for the pin, a bearing ball in a screw for the fulcrum, another bearing ball in a screw to bear on the end, and a wobble bar to a four-bar parallel-movement flexure for the output, which he’s measuring with an LVDT. He even has antibacklash flexures on the threads of his screws.
on 02025-12-09#flexure #microscope #hardware #paper #toread
on 02017-03-11#flexure #microscope #hardware for printing in plastic to get submicron stage positioning
on 02017-03-11#pdf #paper on #mechanical #flexure #metamaterials
on 02016-10-04PowerPoint slides on how to design a #flexure system. #mecheng
on 02015-08-12Designing a #flexure bearing with #Solidworks, simulating it with #FEA, and #machining it out of steel on a waterjet cutter. Lots of tips in the comment thread on #mecheng design.
on 02015-08-12