Answer to Question #297147 in Mechanical Engineering for Dheya

Question

In crank and slotted lever quick return mechanism, the crank length is (100 +X )mm and the distance between the fixed center is (225+X)mm. The length of the slotted lever is (525+X)mm. Determine the ration of time of cutting stroke to time of return stroke. Also calculate the length of the stroke . Note where X is two digit number made from the last two digit of the registration number of the students For example if the reg. no. of the student is 11912081 then X=81 and crank length is 80+81=161mm Draw the neat and clean diagram with proper scale. Rough drawings will not be considered. 

Answer 1

Crank length =181mm

Fixed center=306mm

Length of slotted lever=606mm

Ratio of times=606/306

=1.98

Length of stroke=306-181

=125mm