US 11,808,539 B2
Method for manufacturing gun barrels
James Anthony Stewart, Northamptonshire (GB)
Assigned to ENGINEERING TECHNOLOGIES & MANUFACTURING LTD., Northampton (GB)
Appl. No. 17/785,031
Filed by Engineering Technologies & Manufacturing Ltd., Northamptonshire (GB)
PCT Filed Dec. 8, 2020, PCT No. PCT/GB2020/053145
§ 371(c)(1), (2) Date Jun. 13, 2022,
PCT Pub. No. WO2021/116673, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 1918439 (GB), filed on Dec. 14, 2019.
Prior Publication US 2023/0036040 A1, Feb. 2, 2023
Int. Cl. F41A 21/06 (2006.01); B23B 41/02 (2006.01)
CPC F41A 21/06 (2013.01) [B23B 41/02 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for forming a set of gun barrels, comprising:
machining an elongate key along a length of a metal billet;
mounting the metal billet on a machining jig, clamped along the key;
performing CNC milling operations on the mounted metal billet in a 5-axis CNC milling machine to form a set of gun barrels having a pair of bores, a rib, and a web connecting the elongate key to the rib, the rib extending lengthwise proximate the elongate key; and,
separating the set of gun barrels from the key along the length of the rib section.