RTR element
grabcad
RTR Mechanism it's a type of dynamic (movement) analysis in space, usually used design the motion of robots or machines that can move like arms, although they can get more complex depending on the design. RTR basically stands for Rotation Translation Rotation http://books.google.ro/books?id=i8_ko_NDmK8C&pg=PA119&hl=ro&source=gbs_toc_r&cad=4#v=onepage&q&f=false
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