
New Manufacturing Management Employing New JIT ◾ 379
calculated using Equation 10.29 (Suzuki, 2005; Tanaka et al., 1981). e bolt and
nut dimensions necessary for calculation of these coecients are given in Table 10.3.
μ
β
β
α
s
s
Td F
=
−
+
2
2
tan
cos
(10.28)
m=
2T
w
w
(10.29)
where:
μ
s
= the friction coecient of the threaded portion
T
s
= the torque of the threaded portion
d
2
= pitch diameter
F= axial force
β= lead angle
α= thread angle
μ
w
= friction coecient of the bearing surface
T
w
= torque of the bearing surface
d
w
= equivalent diameter of torque on bearing surfaces
e dimensions of the bolt are actually measured here, and units are in mil-
li