| Job Title |
Pressure-test Operator |
| Job Description |
Measures Propellant Force Of Powder Charge By Firing Small
Arms Cartridges And Shotshells In Pressure-testing Device:
Selects Test Barrel According To Type And Caliber Of Cartridge
To Be Fired. Secures Breech End Of Barrel In Fixture Containing
Breech-block, Hammer, And Firing Pin, Using Handtools And
Gauges. Inserts Gas Check And Steel Piston Into Vent In Barrel
Wall. Positions Lead Or Copper Slug Of Standard Length On Piston
And Tightens Yoke-mounted Setscrew Which Acts As Anvil To Secure
It. Fires Cartridge And Measures Compressed Slug For Reduction
In Length, Using Micrometer. Converts Reduction In Slug Length
To Pressure Expressed In Pounds-per-square Inch, Using
Conversion Chart. Computes Average Pressure For Specified Number
Of Cartridges. May Perform Velocity Tests On Projectiles.
|
|
