ESDU 92014:2011

$62.40

Blending Profiles of Disc Cams with Radial Translating Roller Followers – Part 1: to Reduce Segment Angle, Reduce Reference Circle Radius or Increase Follower Lift

Published By	Publication Date	Number of Pages
ESDU	2011-06	NA

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Category: ESDU

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Description

ESDU 92014 gives methods for designing blended cam profiles
meeting the criteria that the maximum pressure angle does not
exceed a specified value and that profile undercutting is avoided.
Each rise or return motion segment is formed by blending components
of two single-law segments at the point of maximum follower
velocity. Either a hand calculation method may be used, with the
graphical data of ESDU 92005, or the computer program (ESDUpac
A9214). Both methods apply to six commonly used cam laws. The input
is the chosen pressure angle, roller diameter, and blending ratio;
also two out of segment angle, reference circle radius and follower
lift are input and the optimum value of the third is found. The
advantages increase with blending ratio and unblended segment angle
but incur a decreased minimum profile convex radius of curvature
and increased peak acceleration away from the cam. The program
allows a set of blending ratio values to be explored and, once a
suitable value has been chosen, the program can be run in another
mode to give full details of the cam profile and the follower
motion. The theoretical background is fully explained, step-by-step
design procedures are provided, and the input to and the output
from the program are illustrated with fully worked examples. ESDU
83027 is complementary and presents an alternative hand calculation
method of blending applicable to cams driving either translating or
swinging arm followers.