TM 9-3405-215-14&P
NAME
NUMBER
1434
PROJECT
ENGINEERING ADJUSTMENT SUMMARY
120789-2
8
11
SHEET
OF
MODEL DBW-15
WELD LEVER DRAG SPRING
The weld lever drag spring (item 1, Fig. 5) serves two functions:
First, the upper corner acts as a detent to locate the movable jaw for
annealing band; and second, the force exerted by the spring against the
weld lever provides the frictional drag to hold the lever at any of the
several required initial jaw gap settings for welding. This allows the
operator to clamp a blade in the welder or adjust the upset force selector
without disturbing jaw gap setting.
The spring is mounted on the band width escutcheon, (item 2,
Fig. 5). (Both are secured by
two screws.) It is
adjusted by
shimming
between the escutcheon and the spring. Shim as required to obtain both
objectives. Shims under either top or bottom screws will affect function,
however, the top shim (item 3, Fig. 5) usually is used to establish detent,
and the bottom shim (item 4, Fig. 5) to establish frictional drag.
MAXIMUM JAW GAP
With the weld lever in the anneal position, (as located by the
detent of the drag spring) and the upset force selector in its widest
position, turn the jaw gap adjustment screw (item 3, Fig. 4) to obtain
15/32" jaw gap. Lock the adjustment in place.
Prepared by: Roger Harris
Approved:
Date: 7-31-69
150