Method for making a precisely machined part

A method of manufacturing a precisely machine shaped part having a finish diameter and a given design comprising the steps of:

• punching a disc blank from a sheet of stock material having a given thickness;
• forming a cup-shaped blank having a first given diameter and a first given length;
• drawing said cup-shaped blank to establish an intermediate diameter which is less than said first given diameter but greater than said finished diameter and to establish a second given length which is longer than said first given length thereby creating a generally elongate right cylindrically shaped part having a continuous sidewall and opened edge;
• drawing said generally elongate right cylindrically shaped part to establish said finish diameter while simultaneously creating a preform shoulder in the continuous sidewall of the generally elongate right cylindrically shaped part;
• drawing said generally elongate right cylindrically shaped part to cut the preform shoulder and the material of the sidewall existing between the preform shoulder and said sidewall open leading edge from the remaining portion of said sidewall;
• and
• working the remaining upstanding sidewall of said generally elongate right cylindrically-shaped part by rolling the upstanding sidewall between mating rotating members to cause a desired pattern to be deformed into the sidewall.

A method of forming a generally elongate right cylindrical-shaped part comprising the steps of:

• forming a generally elongate right cylindrically-shaped part from a blank defined by a sidewall of a given thickness and a base portion integrally connected with one another at one end of said part;
• establishing a reference point on said sidewall corresponding to the point thereon where the pattern design is to be first imparted to the sidewall;
• providing a rotating arbor and a rotating roll segment defined by a leading edge and a trailing edge and positively coupling one with the other for unitary rotational intermittent movement;
• orienting the outer surface of said arbor and the outer surface of said roll segment relative to other another when in a stopped condition such that the arbor outer surface is spaced from the leading edge of the roll segment by at least about the thickness of said sidewall;
• providing said outer surface of said arbor and said outer surface of said roll segment as complementary surfaces defining a pattern to be imparted to the sidewall of said part;
• deforming the sidewall of said part by causing the blank form of the part to be placed over said arbor when said arbor and the roll segment are in the stopped condition and thereafter causing the arbor and the roll segment to be rotated relative to one another to cause the pattern to be imparted from the complementary outer surfaces of arbor and the roll segment and into the material;
• circumscribing said pattern totally about said outer surface of said arbor and forming said pattern along the outer surface of said roll segment such that it extends along a length as defined between said leading and trailing edges and defining said length such that it slightly exceeds the circumference of said arbor;
• establishing said stopped condition orientation between the roll segment and the arbor such that for a given revolution of said roll segment, said arbor rotates a multiply of that revolution with both the arbor and the roll segment returning simultaneously to said established reference orientation.