AEC Colortronic Granulator - M103 - Manual (Page 21)

5-4 Sharpening the Knives
Under normal operating use, the cutting edge of the knives will eventually become dulled,
resulting in reduced cutting efficiency. The blunt knives may either be re-ground to restore
the cutting edge, or replaced with new knives when regrinding is not possible.
Note: The minimum dimensions given for the rotor knife and bed knife cannot be
combined to produce a cutting combination. For example, a bed knife ground
to its minimum dimension cannot be combined with a rotor knife that is also
ground to its minimum dimension.
Bed Knives
Place the bed knife blades with the reverse side at right angles to the sharpening board of the
sharpening machine. The blunted blades are sharpened at a 15º angle until the cutting edge is
completely sharp. See Figure 1.
Note: If the cutting edge shows any change in color after the sharpening process, the
blades are useless and must be replaced with new ones.
Rotor Knives
Place the rotor blades with the reverse side at right angles to the sharpening board of the
sharpening machine. The blunted blades are sharpened at a 50º angle until the cutting edge is
completely sharp. See Figure 1.
Note: If the cutting edge shows any change in color after the sharpening process, the
blades are useless and must be replaced with new ones.
Figure 1: Knife Sharpening Specifications
Rotor Knives Bed Knives
4 Inch Granulator Chapter 5: Maintenance 21 of 47