Method of making camshaft for reciprocable piston engines

A method of making a camshaft having cam and bearing ring members on a hollow shaft with the cam ring members laterally offset relative to the axis of the shaft, which includes placing cam and bearing ring members on the tubular shaft, mounting said members on said tubular shaft in dies to preserve their shape, each of said ring members having in the inner wall thereof at least one recess means extending substantially the length of the member, and expanding said tubular member into said ring members and into said recess means to secure said ring members to said shaft with the cam ring members laterally offset relative to the axis of the shaft.