# Ch:4 Manufacturing considerations¶

## exa 4-1 - Page 112¶

In [1]:
from math import sqrt
d=70#
dmin=50#
dmax=80#
D=sqrt(dmin*dmax)#
D=63#
i=0.458*(D**(1/3))+(0.001*D)#

#standard tolerance for H8 is ST1
ST1=25*i#
ST1=ST1*10**-3#
#standard tolerance of shaft for grade g7 is ST2
ST2=16*i#
ST2=ST2*10**-3#
es=-(2.5*(D**0.333))#
es=es*10**-3#
ei=es-ST2#
#Lower limit for hole is LLH
#Upper limit for hole is ULH
#Upper limit for shaft is ULS
#Lower limit for shaft is LLS
LLH=d#
ULH=LLH+ST1#
ULS=LLH+es#
LLS=ULS-ST2#
#Maximum clearance is Cmax
#minimum clearance is Cmin
Cmax=ULH-LLS#
Cmin=LLH-ULS#
# printing data in scilab o/p window
print " LLH is %0.1f mm "%(LLH)#
print "\n ULH is %0.3f mm "%(ULH)#
print "\n ULS is %0.2f mm "%(ULS)#
print "\n LLS is %0.2f mm "%(LLS)#
print "\n Cmax is %0.3f mm "%(Cmax)#
print "\n Cmin is %0.3f mm "%(Cmin)#

 LLH is 70.0 mm

ULH is 70.013 mm

ULS is 69.99 mm

LLS is 69.98 mm

Cmax is 0.031 mm

Cmin is 0.010 mm


## exa 4-2 - Page 112¶

In [2]:
d=25#
#Lower limit for hole is LLH
#Upper limit for hole is ULH
#Upper limit for shaft is ULS
#Lower limit for shaft is LLS
ULH=d+0.021#
LLH=d+0#
ULS=d+0.041#
LLS=d+0.028#
#Maximum interference is Cmax
#minimum interference is Cmin
Cmax=ULS-LLH#
Cmin=LLS-ULH#
# printing data in scilab o/p window
print "Cmax is %0.3f mm "%(Cmax)#
print "\nCmin is %0.3f mm "%(Cmin)#

Cmax is 0.041 mm

Cmin is 0.007 mm


## exa 4-3 - Page 113¶

In [3]:
d=50#
Es=0.039#
Ei=0#
es=-9*10**-3#
ei=-34*10**-3#
#Shaft dia is D
D=d+es#
#Lower limit for hole is LLH
#Upper limit for hole is ULH
#Upper limit for shaft is ULS
#Lower limit for shaft is LLS
ULH=d+Es#
LLH=d+Ei#
ULS=d+es#
LLS=d+ei#
#Maximum interference is Cmax
#minimum interference is Cmin
Cmax=ULH-LLS#
Cmin=LLH-ULS#
# printing data in scilab o/p window
print " ULH is %0.3f mm "%(ULH)#
print "\n LLH is %0.3f mm "%(LLH)#
print "\n ULS is %0.3f mm "%(ULS)#
print "\n LLS is %0.3f mm "%(LLS)#
print "\n Cmax is %0.3f mm "%(Cmax)#
print "\n Cmin is %0.3f mm "%(Cmin)#
print ' Therefore, H8g7 is easy running fit'

 ULH is 50.039 mm

LLH is 50.000 mm

ULS is 49.991 mm

LLS is 49.966 mm

Cmax is 0.073 mm

Cmin is 0.009 mm
Therefore, H8g7 is easy running fit


## exa 4-4 - Page 114¶

In [4]:
d=30#
Es=0.025#
Ei=0#
es=11*10**-3#
ei=-5*10**-3#
#Shaft dia is D
D=d+es#
#Lower limit for hole is LLH
#Upper limit for hole is ULH
#Upper limit for shaft is ULS
#Lower limit for shaft is LLS
ULH=d+Es#
LLH=d+Ei#
ULS=d+es#
LLS=d+ei#
#Maximum interference is Cmax
#minimum interference is Cmin
Cmax=ULH-LLS#
Cmin=ULS-LLH##

# printing data in scilab o/p window
print " ULH is %0.3f mm "%(ULH)#
print "\n LLH is %0.3f mm "%(LLH)#
print "\n ULS is %0.3f mm "%(ULS)#
print "\n LLS is %0.3f mm "%(LLS)#
print "\n Cmax is %0.3f mm "%(Cmax)#
print "\n Cmin is %0.3f mm "%(Cmin)#

 ULH is 30.025 mm

LLH is 30.000 mm

ULS is 30.011 mm

LLS is 29.995 mm

Cmax is 0.030 mm

Cmin is 0.011 mm