Chapter9-Cams and Followers

Ex2-pg247

In [3]:
##CHAPTER 9 ILLUSRTATION 2 PAGE NO 247
##TITLE:CAMS AND FOLLOWERS
import math
pi=3.141
s=4.##         follower movement in cm
theta=60.##    cam rotation in degrees
THETA=60.*pi/180##   cam rotation in rad
thetaD=45.##    after outstroke in degrees
thetaR=90.##....angle with which it reaches its original position in degrees
THETAR=90.*pi/180##   angle with which it reaches its original position in rad
THETAd=360.-theta-thetaD-thetaR##      angle after return stroke in degrees
N=300.##   speed in rpm
w=2.*pi*N/60.##   speed in rad/s
Vo=pi*w*s/2./THETA##   Maximum velocity of follower during outstroke in cm/s
Vr=pi*w*s/2./THETAR## Maximum velocity of follower during return stroke in cm/s
Fo=pi**2.*w**2.*s/2./THETA**2./100.##Maximum acceleration of follower during outstroke in m/s**2 
Fr=pi**2.*w**2.*s/2./THETAR**2/100.##Maximum acceleration of follower during return stroke in m/s**2
print'%s %.1f %s %.1f %s '%('Maximum acceleration of follower during outstroke =',Fo,' m/s**2''Maximum acceleration of follower during return stroke= ',Fr,' m/s**2')

Maximum acceleration of follower during outstroke = 177.6  m/s**2Maximum acceleration of follower during return stroke=  78.9  m/s**2

Ex3-pg249

In [2]:
##CHAPTER 9 ILLUSRTATION 3 PAGE NO 249
##TITLE:CAMS AND FOLLOWERS
import math
pi=3.141
s=5.##         follower movement in cm
theta=120.##    cam rotation in degrees
THETA=theta*pi/180.##   cam rotation in rad
thetaD=30.##    after outstroke in degrees
thetaR=60.##....angle with which it reaches its original position in degrees
THETAR=60.*pi/180.##   angle with which it reaches its original position in rad
THETAd=360.-theta-thetaD-thetaR##      angle after return stroke in degrees
N=100.##   speed in rpm
w=2.*pi*N/60.##   speed in rad/s
Vo=pi*w*s/2./THETA##   Maximum velocity of follower during outstroke in cm/s
Vr=pi*w*s/2./THETAR## Maximum velocity of follower during return stroke in cm/s
Fo=pi**2.*w**2.*s/2./THETA**2./100.##Maximum acceleration of follower during outstroke in m/s**2
Fr=pi**2*w**2.*s/2./THETAR**2/100.##Maximum acceleration of follower during return stroke in m/s**2
print'%s %.1f %s %.1f %s '%('Maximum acceleration of follower during outstroke =',Fo,' m/s**2''Maximum acceleration of follower during return stroke= ',Fr,' m/s**2')

Maximum acceleration of follower during outstroke = 6.2  m/s**2Maximum acceleration of follower during return stroke=  24.7  m/s**2

Ex5-pg252

In [1]:
##CHAPTER 9 ILLUSRTATION 5 PAGE NO 252
##TITLE:CAMS AND FOLLOWERS
import math
pi=3.141
N=1000.##    speed of cam in rpm
w=2.*pi*N/60.##  angular speed in rad/s
s=2.5##   stroke of the follower in cm
THETA=120.*pi/180.##  ANGULAR DISPLACEMENT OF CAM DURING OUTSTROKE IN RAD
THETAR=90.*pi/180.##ANGULAR DISPLACEMENT OF CAM DURING DWELL IN RAD
Vo=2.*w*s/THETA##   Maximum velocity of follower during outstroke in cm/s
Vr=2.*w*s/THETAR##Maximum velocity of follower during return stroke in cm/s
Fo=4.*w**2.*s/THETA**2.##Maximum acceleration of follower during outstroke in m/s**2
Fr=4.*w**2.*s/THETAR**2.##Maximum acceleration of follower during return stroke in m/s**2
print'%s %.1f %s %.1f %s '%('Maximum acceleration of follower during outstroke =',Fo,' m/s**2''Maximum acceleration of follower during return stroke= ',Fr,' m/s**2')

Maximum acceleration of follower during outstroke = 25000.0  m/s**2Maximum acceleration of follower during return stroke=  44444.4  m/s**2