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Quality Crimp Handbook
the process. Detecting a process change when it
happens helps prevent many thousands of bad
crimps.
necessary to provide a good metal-to-metal contact. If
this does not occur, resistance can increase. Over-
crimping a crimp termination will reduce the circular area
of the conductor and increase resistance.
Pull Force Testing
Shut Height
This is the distance (at bottom dead center on a press)
from the tooling mounting base plate to the tooling
connection point on the ram of the press.
Figure 4-4
Pull force testing is a quick, destructive way to
evaluate the mechanical properties of a crimp
termination.
Pull force testing results out of allowed range are
good indicators of problems in the process. Cut or
nicked strands in the stripping operation, lack of bell
mouth or conductor brush, or incorrect crimp height
or tooling will reduce pull force tests results. Wire
properties and stranding, and terminal design
(material thickness and serration design), also can
Terminal Position
WIRE
PUNCHES
increase or decrease the value of the results of a
pull force levels.
ANVILS
Figure 4-6
TERMINALS
If results of a pull force tests are within an allowed
range, it assures that proper crimp force has been
applied during crimping. It is crucial as, when
making a crimp, enough force must be applied to
break down the layer of non-conductive oxides that
may build up on the stripped conductor and the tin-
plating on the inside of the terminal grip. This is
PRESS BASE PLATE
RAM
SHUT HEIGHT
GAUGE
Figure 4-5
The terminal position is set by the alignment of the
terminal to the forming punch and anvils, and the carrier
strip cut-off tooling. The tool set-up determines
conductor bell mouth, cut-off tab length, and terminal
extrusions
Order No: TM-638000029
Revision: D
Release Date: 09-04-03
Revision Date: 12-23-09
UNCONTROLLED COPY
Page 8 of 24
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