- A small three throw crankshaft has cranks of radii 125 mm set at an angle of 120 degree with each other. And are equally spaced with a pitch of 250 mm. The revolving masses at crank radii are same for each line and amount of — kg (Take value of mass as the roll number of any member of the group). The shaft is supported in two bearings symmetrically arranged with respect to cranks and 850 mm apart. Determine the dynamical loads on the bearings for a speed of 500 rev/min.
The shaft is to be balanced by means of a mass at a radius of 187.5 mm in the plane of crank 1 and a mass at radius 250 mm attached to a flywheel situated 225 mm beyond the bearing adjacent to crank 3. Determine the magnitude of these balance masses and their angular positions relative to crank 1
