BCQ4 is a four-bar linkage. Q2 and Q4 are fixed centers on a horizontal line 10-inches apart. Q2B is a link 5-inches long oscillating about Q2. Q4C is a crank 21⁄2-inches long which rotates about Q4. BC is a connecting rod 111⁄2-inches long. Q2 is to the left of Q4. A link EF, 6-inches long is pinned to Q2B at E, 11⁄2-inch.from B. Another link, GF, 31⁄2-inches long is pinned to link BC, 4-inches from C. These links, EF and GF, are pinned together at F in their upper position. Trace the paths of the points F and G while Q4C makes 1 complete revolution. Find the points for each 15o position of Q4C and any others necessary in order to secure a smooth curve. Scale: Space, 1⁄2 in. = 1 in.
Q2BCQ4 is a four-bar linkage. Q2 and Q4 are fixed centers on a
horizontal line 10-inches apart. Q2B is a link 5-inches long oscillating about
Q2. Q4C is a crank 21⁄2-inches long which rotates about Q4. BC is a connecting
rod 111⁄2-inches long. Q2 is to the left of Q4. A link EF, 6-inches long is
pinned to Q2B at E, 11⁄2-inch.from B. Another link, GF, 31⁄2-inches long is
pinned to link BC, 4-inches from C. These links, EF and GF, are pinned
together at F in their upper position.
Trace the paths of the points F and G while Q4C makes 1 complete
revolution. Find the points for each 15o position of Q4C and any others
necessary in order to secure a smooth curve.
Scale: Space, 1⁄2 in. = 1 in.

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