Question

A screw-operated press is shown in Figure 4. The screw lead has 0.3 cm/rev, both in a right-hand and left-hand orientation, as shown. The handle rotates counterclockwise at 45 rpm to drive the pressure plate downward. [Sebuah skrew-tekanan beroperai adalah seperti Gambarajah 4. 'Lead' skru adalah 0.3 cm/rev, kedua-dua pada arah selah kanan dan sebelah kiri seperti ditunjukkan. Pemegang berpusing arah jam pada 45 rpm bagi memacu menurun plat tekanan.) (i) Sketch a kinematic diagram and identify Degrees of Freedom (Lakarkan rajah kinematik dan kenalpasti Darjah Kebebasan. ] (ii) If the position, B is 25°, determine and explane the velocity of the pressure plate. [Jika posisi, ß adalah 25%, tentukan dan terangkan kelajuan pada plat tekanan.) Left-hand Right-hand thread thread Pressure plate 2 2 Figure 4 [Gambarajah 47

Answer 1

i) One degree of freedom. The system having one degree of Froedon. There is only one isput is required (screw rotation) to control the output (pressure plate) of the system i lead has 0.3 cm/rer. The screw Ver Velocity or point B=Y= 0.3 xtes sont min = 13.5 cm/min YB = 135cmimin 8 2.22' esines VA IC.A 'I.C I.c.B Ve v Lo2 13.5 VA (22ft e sinis los25 l=2x30.48cm Cosas la bo.abem 13.5x กฎา Velocity ols pressure VA=28.951cm/smin plate; VA =