TM 11-7440-284-14
4-26. CENTER PUNCHING AND DRILLING FRONT REINFORCEMENT SUPPORT MOUNTING HOLES.
This task covers:
1. Center punching
2. Pilot drilling
3. Final drilling
INITIAL SETUP
Tools
Personnel Required
One mechanic
Electric drill
1/8-inch drill bit
Equipment Condition
9/32-inch drill bit
Center punch
Areas located and marked.
Hammer
Materials/Parts
None
ACTION
ITEM
REMARKS
LOCATION
CENTER PUNCHING
Using hammer and center punch, punch.
Forward carrier
Marks (1)
walI
PILOT DRILLING
Using electric drill and 1/8-inch drill
Marks (1)
Forard carrier
bit, drill.
wall
FINAL DRILLING
Using electric drill and 9/32-inch drill
Forward carrier
Marks (1)
wal I
bit, drill.
4-52
