公开(公告)号：US11971234B2

公开(公告)日：2024-04-30

申请号：US18102695

申请日：2023-01-28

Applicant: Paul Lee Ewing, Jr.

Inventor： Paul Lee Ewing, Jr.

IPC: F41A21/18 ,  B21D51/20

CPC classification number: F41A21/18 ,  B21D51/20

Abstract: A method of forming a chamber in a barrel blank has the steps of providing an elongated firearm barrel blank defining a bore and having a muzzle end and an opposed breech end, securing the blank in a fixture, determining a first reference location of the bore at a position proximate to the breech end, based on the first reference location, machining a first rough chamber bore at the breech end and along the bore to a selected depth, determining a second reference location of the bore at a position beyond the selected depth, and based on the second reference location, machining a second precision chamber bore. The fixture may be stationary during the steps of determining and machining. The step of determining a first reference location may include probing a surface of the bore and may include probing at least three different positions about the bore.

公开(公告)号：US20240219139A1

公开(公告)日：2024-07-04

申请号：US18609024

申请日：2024-03-19

Applicant: Paul Lee Ewing, JR.

Inventor： Paul Lee Ewing, JR.

IPC: F41A21/18 ,  B21D51/20

CPC classification number: F41A21/18 ,  B21D51/20

Abstract: A method of forming a chamber in a barrel blank has the steps of providing an elongated firearm barrel blank defining a bore and having a muzzle end and an opposed breech end, securing the blank in a fixture, determining a first reference location of the bore at a position proximate to the breech end, based on the first reference location, machining a first rough chamber bore at the breech end and along the bore to a selected depth, determining a second reference location of the bore at a position beyond the selected depth, and based on the second reference location, machining a second precision chamber bore. The fixture may be stationary during the steps of determining and machining. The step of determining a first reference location may include probing a surface of the bore and may include probing at least three different positions about the bore.

公开(公告)号：US20230243613A1

公开(公告)日：2023-08-03

申请号：US18102695

申请日：2023-01-28

Applicant: Paul Lee Ewing, JR.

Inventor： Paul Lee Ewing, JR.

IPC: F41A21/18 ,  B21D51/20

CPC classification number: F41A21/18 ,  B21D51/20

Abstract: A method of forming a chamber in a barrel blank has the steps of providing an elongated firearm barrel blank defining a bore and having a muzzle end and an opposed breech end, securing the blank in a fixture, determining a first reference location of the bore at a position proximate to the breech end, based on the first reference location, machining a first rough chamber bore at the breech end and along the bore to a selected depth, determining a second reference location of the bore at a position beyond the selected depth, and based on the second reference location, machining a second precision chamber bore. The fixture may be stationary during the steps of determining and machining. The step of determining a first reference location may include probing a surface of the bore and may include probing at least three different positions about the bore.