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shear blade (12) but leave it just loose enough to slide.
5. The upper shear blade (12) has an adjusting screw (8) and screw (6) that are used to adjust
the blade’s position. The screw (6) should be loosened with a wrench. Then the lock nut (7)
should be loosened and held using a box-end wrench (not included) and the adjusting screw
can be adjusted. The upper shear blade (12) should be adjusted for different material types
or thicknesses.
Adjusting the upper shear blade (12)
For sheet steel the formula is:
Gap = steel thickness divided by 5.
The gap will be slightly smaller for rubbery
or soft materials. The gap should be slightly
larger for hard materials.
When the two blades line up with the proper
gap, tighten and hold the adjusting screw (8)
while you tighten the lock nut (7). Then, tighten the screw (6).
6. Check that the blades will operate properly before use. The machine should always be tested
on scrap material before use on final work material.
7. If you sharpen the blades, maintain the original dimensions of a 12° angle on the upper shear
blade (12) with an 8° angle across its thickness. Maintain a 4° angle on the butt of the lower
shear blade (2) as shown in the illustration below.
REPLACING CARBON BRUSHES
After considerable use, your electric metal shear may not run as well as usual. If it starts or runs
slowly, makes a grinding noise or will not run at all, the problem may be worn carbon brushes.
1. Unplug your tool before beginning work.
2. To examine the condition of the brushes,
unscrew each brush cap (43) and remove each
brush (42).
NOTE: Record the position of each carbon brush
as you remove it, so you can replace them in
exactly the same way. Carbon brushes wear into
the armature. If they are replaced in a different
orientation, they will have to undergo additional
wear before they again fit properly.
3. If the carbon brushes (42) are severely worn
(less than 1/8” carbon remaining) they should be replaced. Also if either brush is cracked or
chipped both brushes must be replaced. If they are glazed, but more than 1/8” in length, the
glaze can be removed with a pencil eraser, and the brushes reused. If they are in good
condition and more than 1/8” remains, replace the original brushes in the exact configuration
