A crank QB, 9 in. long, rotates clockwise at 75 rpm and is connected to the...

 

Transcribed Image Text:

A crank Q₂B, 9 in. long, rotates clockwise at 75 rpm and is connected to the mid point of a link CD 24 in. long. Point C is pinned to a crank Q,C, 42 in. long, whose fixed center Q4 is 40% in. to the right and 15 in. above point Q₂. Point D is connected by means of a connecting rod DF, 48 in. long, to a slide 8. at pin F, whose path is a horizontal line 9 in. below Q₂ and to the right of D. Link BH, 12 in. long, is pinned to CD at B and link GH, also 12 in. long, is pinned to link Q4C at G which is 12 in. to the right of C. Fixed to link GH at G and extending upward and at a right angle to GH is a rod GK, 8 in. long. (a) Find the velocities in feet per second by the resolution and composition method of points B, G, H, K, F and mid point of link DF for the position of the linkage, when the crank Q₂B makes an angle of 60 with the horizontal. (b) Find the velocity of C relative to F and the velocity of K relative to H. (c) Determine the angular velocities in revolutions per minute of the links DF, CD, and QC. (d) Check the velocties obtained in parts a, b, and c, by the relative velocity method. Scales: Space, 1 in. ½ ft; velocity, 1 in. = 5 fps. Time: 6 hr. A crank Q₂B, 9 in. long, rotates clockwise at 75 rpm and is connected to the mid point of a link CD 24 in. long. Point C is pinned to a crank Q,C, 42 in. long, whose fixed center Q4 is 40% in. to the right and 15 in. above point Q₂. Point D is connected by means of a connecting rod DF, 48 in. long, to a slide 8. at pin F, whose path is a horizontal line 9 in. below Q₂ and to the right of D. Link BH, 12 in. long, is pinned to CD at B and link GH, also 12 in. long, is pinned to link Q4C at G which is 12 in. to the right of C. Fixed to link GH at G and extending upward and at a right angle to GH is a rod GK, 8 in. long. (a) Find the velocities in feet per second by the resolution and composition method of points B, G, H, K, F and mid point of link DF for the position of the linkage, when the crank Q₂B makes an angle of 60 with the horizontal. (b) Find the velocity of C relative to F and the velocity of K relative to H. (c) Determine the angular velocities in revolutions per minute of the links DF, CD, and QC. (d) Check the velocties obtained in parts a, b, and c, by the relative velocity method. Scales: Space, 1 in. ½ ft; velocity, 1 in. = 5 fps. Time: 6 hr.

Answer rating: 100% (QA)

a Find the vel oc ities in feet per second by the resolution and composition method of points B G H K F and mid point of link DF for the position of the linkage when the crank QB makes an angle of 60 ... View the full answer