APR 2018
CMT-330TC Three-Knife Trimmer
4-7
4. Routine Tasks
11. Place the knife behind the knife bar while
aligning the lifter handles to the open bolt
slots in the knife bar as shown in Figure
4-15.
Figure 4-15. Knife Installation
12. Lift the knife into the knife bar until the knife
will not go up any further. Look into the in-
spection holes to make sure the knife is as
far up as possible (Figure 4-15).
CAUTION
The knife must be at the extreme
“up” position.
Failure to do this could result in damage to the
knife and/or cut stick/plate.
13. Turn the lifter handles clockwise and se-
curely fasten the lifter and knife to the knife
bar. Make certain the knife does not move
down as the handles are tightened.
14. Place four knife bolts into the four available
holes in the knife and tighten them to 35-40
lbf·ft (47-54 N·m).
15. Turn the lifter handles counterclockwise and
remove the lifter from the machine.
16. Place two knife bolts into the holes from
which the knife lifter handles were removed
and tighten the bolts to 35-40 lbf·ft (47-54
N·m).
17. Repeat all steps for each of the three knives.
Once the knives have been installed, the cutting
depth must be adjusted as described in Section
4.6 Knife Depth Adjustment.
CAUTION
The knives must be adjusted after every knife
change. Improper knife adjustment may cause
damage to the machine.
4.5.3 Knife Life and Sharpening Info
WARNING
Knives are DANGEROUS!!! They are heavy
and very sharp, even after use. Keep the
edge away from your body and keep the area
clear of others when handling knives. Never
touch the cutting edge! To prevent personal
injury and damage to the knife, always keep
knives in their holders with screws tight-
ened. You are aware of the dangers, but oth-
ers may not be. Never attempt to hone,
polish, or service the knife in any way. Fail-
ure to follow safety procedures may result in
severe lacerations or dismemberment.
Knife Blade Life
The number of cuts that a knife makes before it
needs to be sharpened can be affected by many
factors. One important factor is the type of paper
being cut. Abrasive paper, such as recycled pa-
per, soft paper such as newsprint paper, binding
glue thickness, cover stock material, etc. can all
significantly affect knife blade sharpness. Also, if
the knife depth is set too deep, the knife will cut
too deep into the cut plate or cut stick and can
dull the knife blade prematurely.
A properly cared for HSS knife (standard equip-
ment) can last between 5,000 and 10,000 cuts
before it needs to be sharpened.
A properly cared for SHSS knife (optional) can
last between 25,000 and 50,000 cuts before it
needs to be sharpened.
A properly cared for tungsten carbide (WC) knife
(optional) can last between 25,000 and 80,000
cuts before it needs to be sharpened.
Be sure to set the knife alarm according to the
knife type that is installed (See Section 3.6.2 Cy-
cle Counters).
The operator should continually check the qual-
ity of the trim to determine when the knife blade
needs to be sharpened. Some characteristics
that indicate a blade needs sharpening are:
The knife hesitates or stalls while making
a cut.
The sheets are not all cut to the same
length (usually the top few sheets are
longer than the rest of the sheets - this is
sometimes called “draw”).
Cut marks appear on the cut face of the
book.
The profile of the cut (side view) is not per-
pendicular to the table.
The cut does not appear straight when
viewed from the top.
The knife makes a “rougher” sound as it
passes through paper.
Nicks are visible on the cutting edge of the
knife.
Summary of Contents for CMT-330TC
Page 4: ...APR 2018 CMT 330TC Three Knife Trimmer iv Introduction Notes...
Page 28: ...APR 2018 CMT 330TC Three Knife Trimmer 1 24 1 Introduction NOTES...
Page 60: ...APR 2018 CMT 330TC Three Knife Trimmer 3 12 3 Operator s Guide NOTES...
Page 72: ...APR 2018 CMT 330TC Three Knife Trimmer 4 12 4 Routine Tasks NOTES...