Urschel COMITROL 2100, Instruction Manual

Page: 123 / 166

RESHARPENING CUTTING HEADS
URSCHALLOY cutting heads may be
returned to the factory for resharpening, pro-
vided a certain amount of increased cutting
clearance is acceptable. With each grinding,
inside diameter is enlarged approximately
.010". Heads can be sharpened until amount
of oversize reaches unacceptable limit; gen-
erally .030" (.762 mm). When Urschalloy cut-
ting heads are no longer usable, they may be
returned to the factory for rebate. Cutting
heads being returned for sharpening or
rebate should be clean and free from foreign
material. See page 55 for ordering and
returning parts information.
FABRICATED cutting heads with open-
ings between the horizontal separators of
0.150" to 1.500" may be resharpened by fil-
ing. Cutting heads with openings down to
0.100" (2.54 mm) should be returned to the
factory for resharpening; openings below
0.100" (2.54 mm) cannot be resharpened.
To resharpen fabricated cutting heads:
1. Remove cutting head from machine.
See “Disassembly”, page 40.
2. Use appropriate file. See chart. Use a
smooth, second cut or bastard square file
or a smooth or second cut mill (flat) file.
3. Place cutting head in a soft jaw vise
and file from outside to center.
File in
one direction at a 45° angle to the land of
the cutting surface (Figure 33).
NOTE: Cutting head can be sharp-
ened until the land of the cutting edge is
filed to approximately 1/32" (.794 mm) in
width, then a new cutting head is
required.
4. Remove burrs on inside of cutting
head
by honing each vertical land or
running an emery cloth counterclockwise
inside cutting head.
45
MAINTENANCE
Cutting Heads
Figure 33 — Sharpening fabricated cutting heads.
(1) File, (2) Land, (3) Run emery cloth counterclock-
wise inside the cutting head
1/32" MIN.
45°
2
1
Opening Between
Type of Horizontal
File Cutting Head Separators
4" Square A 0.150"
B 0.150"
J 0.180 & 0.240"
K 0.150 — 0.390"
6" Square A 0.270 & 0.510"
J 0.300 — 0.510"
Special Column 0.300 & 0.390"
(14 & 10 column)
4" Flat K 0.510"
Special Column 0.510"
(14 & 10 column)
6" Flat J 0.750 — 1.500"
K 0.750 & 1.500"
Special Column 0.750 — 1.500"
(14, 10 & 7 column)