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-->//(Power Screws) Example 6.10
-->//Refer Fig.6.17 on page 204
-->//Yield tensile strength of 30C8 Syt (N/mm2)
-->Syt = 400
Syt =
400.
-->//Factor of safety fs
-->fs = 3
fs =
3.
-->//Punched holes diameter d (mm)
-->d = 50
d =
50.
-->//Mild steel sheet thickness t (mm)
-->t = 1.5
t =
1.5
-->//Ultimate shear strength of the sheet metal Sus (N/mm2)
-->Sus = 375
Sus =
375.
-->//Mass density of balls dense (kg/m3)
-->dense = 7280
dense =
7280.
-->//Mean radius of balls Rm (mm)
-->Rm = 500
Rm =
500.
-->//Assume screw pitch p (mm)
-->p = 8
p =
8.
-->//Coefficient of friction mu
-->mu = 0.15
mu =
0.15
-->//Minimum lead required lmin (mm)
-->lmin = 5 * 4
lmin =
20.
-->//Unit bearing pressure Sb (N/mm2)
-->Sb = 18
Sb =
18.
-->//Forward stroke displacement fsd (rad)
-->fsd = %pi/2
fsd =
1.5707963
-->//Time required for the forward stroke tf (sec)
-->tf = 1
tf =
1.
Screw
Nominal diameter of the screw(d) = 50.000000 mm
Core diameter of the screw(dc) = 42.000000 mm
Lead of the screw(l) = 24.000000 mm
Nut
Length of the nut(L) = 72.000000 mm
Mass of each ball(m) = 52.421082 kg
Diameter of each ball(dia) = 239.584467 mm
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