Method of manufacturing a diaphragm backing plate

1. A method of manufacturing a diaphragm backing plate for use in a brake booster comprising the steps of:

moving a coil of metal to a first station, said coil having a first and second sides to define a first width;

applying a force to remove a section from the roll of metal to create a first plate defined by a peripheral surface having equal and parallel sides connected to each other by an arcuate segment each of which has a radius that is approximately equal to one-half of the width of the coil plus a minimum width of a desired peripheral lip for the diaphragm backing plate and wherein each parallel side is located at an equal distance from the center of the first plate along a X coordinate in a Y coordinate that is defined by a point where the radius intersects the Y coordinate;

punching a pilot hole in the center of the first plate;

moving the first plate to a second station where the parallel sides and pilot hole retain the alignment therein; and

thereafter rolling the peripheral surface on said first plate to define a uniform diameter for a resulting second plate with the desired peripheral lip having a uniform circumference, said uniform diameter for the second plate being approximately equal to the width of said coil less twice minimum width for said lip while said lip has a scalloped surface with radially inwardly directed circular segments.

2. The method as recited in claim 1 further including the step of:

punching a second pilot hole along the axial center of said coil at distance that is equal to said radius to define an axial center for a next plate.

3. The method as recited in claim 2 wherein said step of removing a section of said coil includes the forming of complimentary sides for said first plate and next plates.