Question

a) Design a fourbar Grashof crank-rocker for 90? of output rocker motion. Write your steps and consider the following in your design
Link4 (output) = 50 mm
Link3 (coupler) = 120mm
b) Determine
1. The toggle positions
2. The lengths of remaining links.
3. The minimum and maximum transmission angle.
4. Find the Grashof condition

Answer 1

Solution A 35cm A' B 1959 459 S. 12.5CM 2 Ends . 120 mm ca) STEPS 1) Draw the 2 exelzeme position of output link (909). (2) Extend the line joining the (3) Measure goom each end on the extended line. (4) Measure the distance between 2 end of the extended line. (5) Mark the center. This center is the fixed point of crank. (6) Join the center to the fixed point of sulput, gives the fixed link. (6) (0) Toggle position :- position where rocker will be at estreme (2) Length of Links :- O A Cerank) 35 mm AB (coupler) - 120mm BC Coutput) = 50 mm OC (fixeerd) 125 mm (3) Minimum Transmision angle = 45° Maximum Transmission angle Transmission angle ! angle between coupler and output 135°

(4) Groashof condition: lmase + Amin + min < P+q Imax = 125mm (oc) lmin = 35mm COA) 125 +35 L 120 +50 le 160 <170

> go ashofs condition is satisfied emin is adjacent to link so it is a crank rocker mechanism
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