CAM DESIGN 355■ Rise High dwell Fall h (a) Low dwell 0 e deg (b) 0 θdcg (c) 0 deg (d) 0 e deg 0 90 180 270360 FIGURE 8-8 The s vajdlagrams of a'bad'cam design y=mx+b (8.2) where m is the slope of the line and b is the y intercept.Substituting variables appropriate to this example in equation 8.2,angle 0 replaces the independent variable x,and the displace- ment s replaces the dependent variable y.By definition,the constant slope m of the displace- ment is the velocity constant K. 3. For the rise segment,the y intercept b is zero because the low dwell position typically is tak- en as zero displacement by convention.Equation 8.2 then becomes: s=K 0 (8.3) 4 Differentiating with respect to e gives a function for velocity during the rise. =K constant (8.4) 5 Differentiating again with respect to 0 gives a function for acceleration during the rise a=0 (8.5)