7.0 Knife Installation/Changing
18
7.3.3 Bevel Angle
Challenge recommends that the bevel angle for the Spartan 150 knives be 20°. Order a re-
sharpened knife to the following specification, “20
O
, DEAD SHARP, NO MICRO-BEVEL.” A micro-
bevel on this knife will cause strenuous cutting. If an operator requires cutting with less physical
strain, knives may be re-sharpened to 18
o
. Note, however, that a knife sharpened at 18
o
has a
shorter lifetime and is more susceptible to damage.
7.3.4 Helpful Suggestions
•
It may be helpful to own a “set” of knives. A set consists of 3 knives: one in the machine,
one as back up, and one at the grinder.
•
If the machine seems to strain but the cut quality is still good, reduce the pile height. You
may also carefully apply glycerin to the bevel when cutting hard, coated paper. Tie a cloth to
the end of a stick; dip the stick in glycerin, and apply. Never apply by hand! In lieu of
glycerin, you may lightly rub white bar soap along the bevel. Lubrication will prolong the life
of your machine and reduce maintenance.
7.3.5 Knife Care
•
To prevent corrosion, new knives are coated with light oil. It should be REMOVED WITH
CARE.
•
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.
•
Always keep knife bolts securely tightened.
•
Store knives in a dry environment to prevent corrosion.
•
Never attempt to service a knife in any way.
Summary of Contents for Challenge Spartan 150M
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