Patent ID: 8545937

Claim:
A method of coating the interior of an open end cylindrical body with liquid coating material, comprising the steps of: rotating said open end cylindrical body; supplying liquid coating material to a spray gun; and spraying liquid coating material from said spray gun through a spray orifice of the spray gun into said open end cylindrical body while said open end cylindrical body is rotating to form a coating on the interior of said open end cylindrical body; wherein said spray orifice is formed in a nozzle tip body, said nozzle tip body having a hemispherically shaped blind bore on its backside, said spray orifice having been formed on the front side of the nozzle tip body by a cutting wheel having straight sidewalls and a cutting edge between said straight sidewalls, said cutting wheel having been moved to cut into said hemispherically shaped blind bore to form said spray orifice, said spray orifice having two major sides with a first dimension along a first axis and two minor sides with a second dimension along a second axis that is transverse the first axis, said major sides have a length of L and said minor sides have a length of W, and wherein W is greater than or equal to about 0.25 L, each said major side having first and second ends that join with ends of each said minor side at approximately right angles.