9
Mark/Punch Starter Hole
A hammer, punch, drill, step hole drill bits, and cleaning
supplies will be used to create a starter hole. This hole
will be the start point for the Nibbler cutting tool, the
hole must be large enough to fit the cutting head of the
Nibbler to begin the cut.
Location of the hole will vary depending on model/size
of the Nibbler used to cut the portal hole.
STEP 1:
Dry run: Hold the Nibbler along the cutting
line to ensure there is enough clearance to
fully rotate the cutting tool without making
contact with the back and bottom panels.
See FIGURE 2.6
STEP 2:
Establish a comfortable starting point,
where the Nibbler will be able to rotate
around the hole clearing the back and
bottom panels.
STEP 3:
Mark a punch location within the portal
hole. The mark should be inside the
circle and offset the minimum distance
for the cutting hole to be drilled. 3/4" for
these procedures. See FIGURE 2.7
STEP 4:
Use the hammer to strike the punch,
locating an indention in the panel. This
indention provides a starting point for the
drill bit. See FIGURE 2.8 and 2.9
FIGURE 2.9 - Punch Indention
FIGURE 2.8 - Punch Indention
FIGURE 2.6 - Test Clearance
FIGURE 2.7 - Punch Location
SECTION TWO
