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Design of base circle radius for expansible camoid

Shi Yonggang; Zhang Weiming(Deptartment of Mechanical Engineering)  
For dasing of spatial cam mechanism,the radius of base circle is an important parameter.It influences not only the pressure angle of mechanism,but also the curvature of earn contoUrs.The fromer plays an important parameter in determination of efficiency.And the later plays the character of earn contOUr,on that whether there is Sharp point or distortion from self-intersecting.This paper provided the formulars to determine the radius of base circle for design of drum cam mechanism and of tapered earn mechanism based on the conditions of pressue angle and f curvature radius of can contour.
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