This document contains instructions for three problems to design four-bar and six-bar linkages to move an object between specified positions, as shown in Figure P3-14. The problems ask the reader to add a driver dyad to limit the motion of a four-bar linkage to create a six-bar linkage that moves the object between positions 1 and 2, between positions 2 and 3, and through all three positions, respectively.

1. DESIGN OF MACHINERY 3rd Ed. by ROBERT L. NORTON © McGraw-Hill 2004
43 86 typ. 184
43 typ. 120
A1
A2
86 typ. 7
90°
105°
130
B1
B2
A3
180 90°
base
B3
167 all dimensions in mm
FIGURE P3-14
Problems 3-49 to 3-51
3-49 Design a fourbar linkage to move the object in Figure P3-14 from position 1 to 2 using
points A and B for attachment. Add a driver dyad to limit its motion to the range of
positions designed making it a sixbar. All fixed pivots should be on the base.
3-50 Design a fourbar linkage to move the object in Figure P3-14 from position 2 to 3 using
points A and B for attachment. Add a driver dyad to limit its motion to the range of
positions designed making it a sixbar. All fixed pivots should be on the base.
3-51 Design a fourbar linkage to move the object in Figure P3-14 through the three positions
shown using points A and B for attachment. Add a driver dyad to limit its motion to the
range of positions designed making it a sixbar. All fixed pivots should be on the base.