When the two ends of the blades have been properly adjusted, It is then necessary to adjust the upper blade to
compensate for the thrust developed against the upper blade during a capacity cut. To do this, the upper blade is
purposely "bowed" towards the operator so that the thrust developed actually straightens the upper blade and produces a
straight cut. While the upper blade and ram is only bowed about 0.001" to 0.003", the deflection to offset this bow will be
developed only during a capacity cut; therefore, if very accurate and straight cuts are required on light material, the bow
must be adjusted out of the ram and the same clearance maintained along the entire length of the blades.
Figure 15. Adjusting the Upper Blade
To make the adjustment on the upper blade, proceed as follows:
CAUTION - For the sake of safety when adjusting the upper blade, place the foot switch on the shear table and
use only the extra long hex wrenches furnished with the shear.
(1)
Raise the ram and then lower it to a point where the blades intersect 1" to the right of the first ram adjusting
screw "H", at the low end of the upper blade (Figure 15). Make an adjustment by turning adjusting screw "H"
until the clearance between the blades is the same as the clearance at the end of the blades. It will be
necessary to loosen the locking screw "D" before this adjustment can be made. Spring "F" should have
sufficient tension to keep adjusting screw "H" solidly against the back brace.
(2)
The next adjustment is made just beneath the second adjusting screw in the same manner as the adjustment in
step 1; however, the clearance should be the same or slightly less, depending on the length of the machine. It is
necessary to lower the ram further for this adjustment to a point where the intersection of the two blades is about
1" to the- right of the second adjusting screw.
15