Most four-edged shear blades are designed to
allow for regrinding both the width and the thickness of the
knives. However, there is a limit to how much material can
be removed from the blades before they should be replaced.
Below is a GUIDE to minimum grinding limits recommended by
the O.E.M.'s.
Initial knife clearance is adjusted by moving
the shear table in and out and/or with shims. If the knife
width is less than the reference minimum (W), the knives may
not cross full length. If the knife thickness is less than
the reference thickness (T), proper knife clearance may not
be possible.
| Shear Blade Original Size |
Minimum Width (W) |
Minimum Thickness (T) |
| 1.000 x 3.000 |
2 5/8" |
3/4" |
| 1.000 x 4.000 |
3 5/8" |
3/4" |
| 1.125 x 5.000 |
4 5/8" |
7/8" |
| 1.500 x 5.500 |
5 1/8" |
1 1/4" |
| 1.750 x 6.500 |
6 1/8" |
1 1/2" |
When
sharpening shear blades, they must be reground to the same
precision tolerances as new knives to maintain a high level
of productivity and ensure quality cuts.