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Page 39 of 53
5. Loosen and remove the knife bolts and lift the knife off the
knife seat removing it from the cutting chamber.
6. Perform the above steps until all the rotor knives are removed.
NOTE: Before replacing the rotor knife with new or sharpened
knives, wipe the knife seats on the rotor, being sure to clean off
all process material. The tapped holes in the rotor (used for
holding the knives in place) should be clear of any dirt, oil, or
process material.
7. Loosen the bed knife bolts and adjusting screws, and pull back
the bed knife so that the rotor knives will collide as they are
installed and rotated.
8. Install new or sharpened knives on each knife seat, making
sure that the rotor is still blocked to prevent it from rotating
while installing each knife.
9. Before re-installing the knife bolts, wipe them clean with a
lightly oil-damped cloth. Do not leave an oil film on the bolt
since lubrication can adversely affect the stress on the bolt
when torqued to the specified values. It is recommended that
the knife bolts be replaced with each new set of knives. This
will reduce the risk of bolt failure due to overstretching.
Always use the specified replacement bolts.
10. Tighten each set of the knife bolts; making sure that the knife is
seated against the back heel in the rotor seat. Before torquing
the bolts, check that a 0.001” feeler gage cannot fit between the
heel and the back of the knife.
11. Torque the rotor knife bolts to 100 Lbs./ft. (14 Kgm, 135 Nm).
12. Adjust the knife gap with the bed knives and close the
machine, following Steps 8-14 in Section 6-4.
6-7 Specifications for Re-sharpening Bed Knives
Every bed knife has two cutting edges, one on each side. When a
blade becomes worn, the knives can be rotated. To regrind these
knives, refer to the data shown in Figure 17. Replacement of these
knives is necessary when their length falls below the recommended
tolerance.