Thursday, March 25, 2021

Correction for engagement windows

The geometry of an oblique locked crossing is not fundamentally altered if the engagement windows are too large to be neglected. The radius, r, used in the calculation, remains the same, but the mechanical radius of the hole cut into the weaver, rm, must be made larger. If the 'thickness' of the engagement window (seen as the cross-section of a double convex lens) is t, then rm = r + t/2.

The best value for t needs to be determined by experiment, as it will depend not only on the thickness of the weaver, but also its elasticity, the desired stiffness of the joint, and how acceptable permanent plastic deformation of the weaver might be.

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