TM 10-5410-229-13&P
5-6.
RIVET REPLACEMENT - Cont’d
minimum allowance of 1/2 diameter for upsetting the shank. Always use the nearest standard rivet length
greater than the calculated sum.
(3) There are specific considerations in laying out the rivet pattern for a repair; These rules will generally apply in all
instances:
(a)
When possible, rivet edge distance, rivet spacing, and distances between rows should be the same as
that of the original installation.
(b)
When new sections are to be added, the edge distance measured from the center of the rivet should
never be less than two times the diameter of the shank. The distance between rivets or pitch should be
at least three times the diameter; the distance between rows should never be less than 2 1/2 times the
diameter.
(c)
Mark the rivet pattern on the metal with a soft pencil to avoid scratching.
(4) Rivet holes may be drilled with either a light power drill or a hand drill (standard shank twist drill) as follows:
(a)
Before drilling, center-punch all rivet locations. The center-punch mark should be large enough to
prevent the drill from slipping out of position.
(b)
Place drill in center-punched mark. When using a power drill, rotate the bit a few turns by hand before
starting the motor. While drilling, always hold drill at a 900 angle to work.
(c)
Avoid excessive pressure; let the drill do the cutting. Never push drill through stock. Remove all burrs
with a metal countersink or file.
(d)
Transfer holes from a drilled part to another part by placing second part over first and using established
holes as a guide, if required.
5-4
