Which of the following has the surface constant choose all t

Which of the following has the surface constant? (choose all that applies) Plane Pair Gear Pair Universal Pair Helix Pair Which of the following has the degrees of freedom of 3? (choose all that applies) Sphere Joint Gear Pair Prism Pair Cam Pair

Solution

a) A - Plain Pair

D- Helix Pair

b) A - Sphere Joint

A spherical pair keeps two spherical centers together. Two rigid bodies connected by this constraint will be able to rotaterelatively around x, y and z axes, but there will be no relative translation along any of these axes. Therefore, a spherical pair removes three degrees of freedom in spatial mechanism. DOF = 3.