TD5/1: THE LOCI ASSIGNMENT

Exercise

(All questions originally set in imperial units.)

1. Figure 1A shows a door stay as used on a wardrobe door. The door is shown in the fully open position. Draw, full size, the locus of end A of the stay as the door closes to the fully closed position. The stay need only be shown diagrammatically as in Fig. 1B .

2. Figure 2 shows a sketch of the working parts, and the working parts represented by lines, of a moped engine. Using the line diagram only, and drawing in single lines only, plot, full size, the locus of the point P for one full turn of the crank BC. Do not attempt to draw the detail shown in the sketch. Show all construction. The trammel method must not be used.

3. In Fig. 3 the crank C rotates in a clockwise direction. The rod PB is connected to the crank at B and slides through the pivot D. Plot, to a scale 11 2 full size, the locus of P for one revolution of the crank.

4. In Fig. 4 the stay BHA is pinpointed at H and is free to rotate about the fixed point B. Plot the locus of P as end A moves from A to A .

5. In Fig. 5 , rollers 1 and 2 are attached to the angled rod. Roller 1 slides along slot AB while roller 2 slides along CD and back. Draw, full size, the locus of P, the end of the rod, for the complete movement of roller 1 from A to B.