Question

A straight-sided cam has both sides tangential to the base circle which is 25 mm radius and the t... A straight-sided cam has both sides tangential to the base circle which is 25 mm radius and the total angle of action is 118°. A lift of 9.4 mm is given to a roller 19.8 mm diameter,the centr of which moves along a straight line passing through the axis of the cam. The camshaft has a speed of 243 rev/min. Determine the following: (a) The radius of the nose arc; (b) The speed of the roller centr when the roller is in contact with the cam at the end of one of the straight flanks adjacent to the nose; (c) The greatest acceleration of the roller centr; Please help, show all calculations and steps.

Answer 1

18+8ytrn s 10 retry. Criven: Basecisde radius. d x= 25mm. Roller radius, 88 = 19.8 mm. = 9.9 mm. lift , h = 9.4mm. speed N243 mev/min. Angle of Action, 24 = 118° w= 2IN = 27 (243) = 25.44 Mad BO b=&yton 4998+15.01 = 24.girom. Q = 59° B = tan sosina 1 = tant I 19.38 in 59 25+9.9 = 25.45°

ce nadius: = Y; +4 + h. 8 + Yn +dy Ertrn = reth = 25+ 9.4 Tr+rn = 34.4 mm. ->0 also, OP+ Sn = sc son from Yces += 8c = 110859+Yn = 25. 0.5154+0=25. > Y = 19.38 mm. I n = 15.01 mm Nose Radius ; fn = 15.0 1mm.

b) speed of the rolex when.groller just leaving the flank Vs WC 8c+05) Top = W(25+9.9) sim 25,45 * otros cos 25,45 3.1.467.94 mm/sect> Maximum acceleration will be at the operepoint ocą !.!; *017 fawzy-c0360-)_ rasime.came) L 4 [1?_r=sima camo] / 1 - Ycos 2 (4-0) (why [--] = 65.mp"(m3a8) |-- 19 .2.0= 22.30