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Page Title:
Chapter 2. DIRECT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS |
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 TM 9-4933-208-34
CHAPTER 2
DIRECT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Section I. INSPECTIONS
b. The Barrel Erosion Gage M8 is manufac-
2-1. Area of Inspection
tured with a fixed stop and is used to inspect
a. All caliber .30, 7.62-mm, and caliber .50
or gage one area or location.
machine gun barrels are checked in front of the
c. The Barrel Erosion Gage M6A1 is manu-
liner. Caliber .50, M2 heavy barrels and AN-
factured with locating grooves for positioning
M2 and M3 aircraft barrels are also checked
stop to assure that caliber .50 barrels are in-
forward of the bullet seat in the liner.
spected in the correct location.
Section II. SERVICEABILITY STANDARDS
b. Barrels should not be condemned solely on
2-2. Serviceability of Barrels
the basis of the number of rounds fired, as
barrels fired under variable conditions (rate
a. Barrels which gage within the "service-
of fire, duration of fire, etc.) will differ in the
able range" are usable in the hands of troops.
amount of wear. Coppering of the liner and
The "preembarkation inspection mark" serves
liner junction will not render the barrel un-
as a rejection point only for barrels destined to
serviceable. The barrel erosion gage will be
accompany troops oversea. The "rejection
used to determine the serviceability of the
mark" indicates an unserviceable barrel.
barrel.
Section III. USE OF GAGE
tube, thus expanding the collet to indi-
2-3. Gage Usage
cate a reject condition.
a. General.
(2) Insert the collet of the erosion gage
(1) The gage employs a split collet meas-
into the wear check gage, collet should
uring head which is expanded AFTER
contact the inside diameter of the
insertion into the barrel by the for-
check gage and produce a slight drag.
ward movement of the tapered portion
Note. To avoid a false reading, care should
of the rod.
be taken to prevent moving the gage rod
(2) The gage is designed to check the bar-
from its setting.
rel from the breech (chamber) end.
(3) T h e e r o s i o n g a g e i s w o r n w h e n t h e
The barrel must be removed from the
collet fails to produce or make contact.
weapon to use the gage. See applicable
Worn or damaged gages will be for-
FM's and TM's for instructions on re-
warded as specified in SB 9-75.
moval of the barrel.
Note. A false reading may be obtained if
c. Precautions in Use of Gage.
the chamber and the barrel are not thor-
oughly cleaned.
(1) Do not expand collet prior to inserting
gage in barrel.
b. Prechecking Gage.
(2) The gage rod must be retracted before
(1) Set the reject ring, of erosion gage,
inserting or removing the gage from
flush with the rear face of the gage
4
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