|About Juno's Spinner 1|
Home > Polyhedral toy > Juno's Spinner
|Condition of elements|
|Juno's Spinner is composed of elastic elements.Those are jointed by a metal eyelet,and can move freely around the joint.
Right figure is a cube type Juno's Spinner.
|We consider Juno's Spinner to ,four-bar linkage mechanism of elements.|
|If we fix A,bar B C can rotate but rotation angle is not always equal.However if four-bar linkage mechanisim is parallelogram,B and C rotate same angle.|
|Let planar four-bar linkage mechanisims closes around element A.When element A is fixed what is the conditon element B,C,,,G can move.
Most simple condition is quadrilateral 1,2,,,6 are all parallelogram.
|Many Juno's Spinner satisfy this parallel conditon but because of elasticity of element, this is not always needed condition.|
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