AEC Colortronic MSH Series 2039 - Manual (Page 30)

C Series Granulators Maintenance 30 of 53
5-8 Replacing and Adjusting the Knives
During use, the clearance between the rotor knives and the bed knives will increase due to
wear. This is a normal condition that requires re-setting this clearance once or twice before it
is necessary to remove the knives for regrinding. Check the knives weekly for wear,
clearance, exposure, and screw tightness.
When new knives are fitted to the machine, adjustment after eight hours of running time may
be required.
Before assembling a new or reground set of knives, make sure the knife seats and mounting
holes are clean. Do not use grease or oil on screws or tapped holes when assembling the
knives.
Knives must be replaced in complete sets, otherwise it will not be possible to obtain even
clearance between the rotor knives and bed knives.
WARNING! Use the rotor locking pin to lock the rotor in position.
Knife Gap Settings
The standard knife gap setting is between 0.006” and 0.008” (0.15 mm to 0.20 mm). The
standard adjustments and settings are made prior to shipment, but the machine may require
re-adjustment or re-setting depending on the application.
Set the knife gaps to the high side unless you process thin materials that require closer
settings. If you experience rapid deterioration of the knives, increase the knife gaps in
increments of 0.0002” (0.05 mm) until the performance improves.
For heavy materials, such as heavy section purgings or other heavy cross-sections, you can
set gaps as large as 0.016” to 0.018” (0.41 mm to 0.46 mm).