(a) Gauge fastener holes to determine the
(g) Enlarge the pilot holes to full size. Use
hole sizes in the existing structure.
several intermediate size drills to bring
holes to inal size. Be careful to keep
drills centered on the fastener holes.
(b) Find the part number of the blind hole
responding in size to the hole diameter.
(h) Deburr the holes in the new part.
(3) Measuring and Scaling Method. The mea-
(c) Insert the proper punches into the fas-
tener holes to be transferred.
suring and scaling method provides an accurate
method of transferring blind holes from parts with
complex curvature and extruded shapes. This tech-
(d) Align the new part over the transfer
nique uses either a line passing through the center
of a hole with markings measured a predetermined
distance from the center point or two lines passing
(e) Lightly tap the part over each transfer
through the center of a hole to locate blind holes.
Figure 7-24 illustrates this method as described below.
Remove the part from the structure and
pilot drill each transfer punch location.