MSD 7R SHEARS
Maintenance
Section 5 Page 15
BLADE ROTATION
New blades in proper adjustment will increase the
cutting performance of the shear. Proper rotation
of blades will provide optimum use and the most
performance from the shear. Recommended blade
rotation is after approximately 80 hours of use;
depending on the material being processed, this
interval may be extended.
When processing thin materials, blade rotation
and shimming is of greater importance than when
processing larger materials. It may be necessary to
shorten blade rotation intervals when processing thin
or non-ferrous materials.
When processing large materials, frequent blade
rotation will extend the life of the blades, however
maintaining the close tolerance blade gap is not as
important. Never operate a shear when the blades
have rounded to a 1/4" (6.4 mm) radius of more.
Maintaining the guide blade gap is still necessary in
large material.
1.
To rotate the blades, remove blade from shear. Do
one blade at a time.
2.
Grind all rough edges from blade.
3.
Clean out blade seat.
4.
Reinstall blade. The fi rst time the blade is rotated it
should be done end for end. The second time fl ipped
over; third time end for end.
5.
When the blades have been used on all four edges
and edges are 1/4" (6.4 mm) radius or more, it will be
necessary to rework or replace blades.
Remember, with damaged or badly worn blades,
cutting ability decreases tremendously and it may
eventually cause structural damage to the shear.
FIGURE 5-4
PRIMARY
BLADE
SECONDARY
BLADE
