King Fahd University of Petroleum & Minerals

Mechanical Engineering Department

ME 309- Mechanics of Machines (042)

HW # 2

Due Date: Monday, March 7, 2005

Problem # 1:

Find the range of values of  L0 (fixed link) if the linkage will theoretically act as a :

(a) Crank rocker mechanism (where link 1 rotates through 360o);

(b) Drag link mechanism; (c) double-rocker mechanism;

(d) Change-point mechanism;

(e) Grashof mechanism;

(f) Triple-rocker mechanism.

L1 (crank) = 400,  L2 (coupler) = 600,  L3 (follower) = 750.

Problem # 2:

Find the length of L3 (follower) so that the linkage forms a crank rocker mechanism and transmission angle falls between 40o and 140o. Given: L1 (crank) = 100 mm, L2 (coupler) = 140 mm, L0 (fixed link) = 120 mm.