Click here to make tpub.com your Home Page

Page Title: Barrel life
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 




img
MIL-M-45945A
4.5.9 Reliability  test. The three machine guns are each
fired 50,000 rounds in 10,000-round cycles from a Government-
approved  firing  fixture  simulating  ground  tripod  mounting.
Unless otherwise specified, the firing is conducted in 200-rounds
complements,  alternating between firing schedules No. 1 and No. 2
(below). Two barrel assembies are to be used alternately
(change after 200 rounds) with each weapon and are cooled to
ambient temperature after each 200 rounds. Firing should be
accomplished using 100-round belts.
4.5.9.1
Firing
schedules
4.5.9.1.1  Schedule
No.1; 10 + 1 round burst at a rate of
one burst every 6 seconds; used for complete complement of 200
rounds.
4.5.9.2  Schedule  No.  2; 25 + 1 round burst at a rate of
one burst every 15 seconds; used for complete completment of 200
rounds.
4.5.9.2  Cleaning  schedule. The weapons shall be cleaned,
inspected and lubricated after each 2,000 rounds and relubricated
after each 1,000 rounds. Semi-fluid lubricant confoming to MIL-
L-46000  is  to  be  used.  .
4.5.9.3 Barrel
life.
4.5.9.3.1  Initial
maintenance.  At  the  start  of  test
during thelast 30 rounds of each of the final 200-round
complements for each barrel in each 10,000-round gun cycle;
cyclic rate shall be measured; and accuracy Projectile velocity,
and evidence of yaw or keyholding determined. Result shall be
compared with the criteria in 3.4.9.3
Informational  test  measurements.  For  informational
a.
purposes, the cyclic rate of fire shall also be recorded over a
20-round burst.  Cyclic rate instrumentatzon shall be the same as
for  function  firing.  The  accuracy  and  projectile  velocityand
yaw of each barrel shall be measured from the firing of a 10-
Targets shall be placed at a range of 100 yards
round burst.
Projectile  velocities  shall  be  measued  abd  recorded
instrumentally at a point 9 yards forward of the muzzle. The yaw
or  keyholding  shall  be  determined  from  the  10-round  burst
Firing schedules No. 1 and N0. 2 do not apply during these 30-
round-periods.
39

Privacy Statement - Press Release - Copyright Information. - Contact Us