Challenge CMT-330TC, Installation And Operator'S Manual

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APR 2018
CMT-330TC Three-Knife Trimmer 4-8 4. Routine Tasks
Sharpening Specifications
Knives for the CMT-330TC are shipped from
Challenge with a 20° bevel angle. Challenge
recommends that a 20° bevel angle be main-
tained when sharpening knives.
The beveled surface should be ground to a 16
micro finish and MUST be back-honed to re-
move any burrs to prevent premature chipping of
the blade edge.
The knives should be ground such that the
height of each knife (from the sharp edge to the
top) is within ±.002” (0.05 mm) along the entire
length of the knife.
The three knives in a set must be ground so that
the height tolerance between the three knives
with respect to each other are within ±.002”
(0.05 mm).
4.5.4 Knife Spacers
Each time a set of knives are sharpened, a small
amount of material is removed. Once the knife
height (Figure 4-16) gets below approximately 2-
5/8” (67mm), the knives will not cut all the way
through books, even when the knife depth is ad-
justed as far down as it will go. When this hap-
pens, knife spacers may be placed on top of
each knife as shown in Figure 4-16 prior to in-
stalling the knives. The spacers are stored in-
side the left rear lower door.
WARNING
When knife spacers are used, the knife
edges should never be below the surface of
the clamps once installed. If this happens,
the knives are too tall and the spacers
should be removed. Failure to do so creates
safety hazards, and damage to the machine
could result.
Figure 4-16. Knife Height
KNIFE HEIGHT USE SPACER?
2.63” to 2.75” (67 to 70 mm)
NO
2.50” to 2.63” (63 to 67 mm)
YES
The knives should not be sharpened to less than
2.50 in. (63.5 mm).
4.5.5 Knife Care Tips
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.
Here are some helpful knife care tips:

It is a good idea to own 3 sets of knives:
one set in the machine, one set as a
backup, and one set at the grinder being
sharpened.

A worn cut plate or cut stick can affect the
cut quality of the bottom sheets. When this
happens, rotate or change the cut plate
and/or
cut stick, even if it’s not time to
sharpen the knife.

While removing or installing a knife, be
careful not to allow the edge to bump
against the machine. Nicks will result.

If a knife bolt is damaged, replace it.

Make sure knife bolts are always securely
tightened.

Store knives in a dry environment to pre-
vent corrosion.

Never attempt to service a knife in any
way.
4.6 Knife Depth Adjustment
The knife depth requires adjustment after every
knife change. The knife depth can also be ad-
justed if the knife is not fully cutting through
books.
WARNING
Knife adjustment is a ONE PERSON
OPERATION! More than one person adjust-
ing the knife creates safety hazards.
Initial Actions
Locate a few books approximatel
y ½” (13mm)
thick. No tools are needed.
Procedure
1. At the touch screen on the front console,
press the “Setup” button to bring up the
setup options screen. The “Parameters” tab
should be active. Now press the “Enable