Urschel COMITROL 1700 - Resharpening Cutting Heads

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; gener-
ally .030" (.762mm). When Urschalloy cutting
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 materi-
al. See page 81 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 filing.
Cutting heads with openings down to 0.100"
should be returned to the factory for resharp-
ening; openings below 0.100" cannot be
resharpened.
To resharpen fabricated cutting heads:
1. Remove cutting head from machine.
See page 44.
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 67).
NOTE:
Cutting head can be sharpened
until the land of the cutting edge is filed to
approximately 1/32" 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 cut-
ting head.
MAINTENANCE
Cutting Heads
65
File Type of Opening Between
Cutting Head Horizontal 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 0.390 & 0.300"
(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)
Figure 67 — Sharpening fabricated cutting heads (1)
File, (2) Land, (3) Deburr counterclockwise
1/32" MIN.
45°
2
3
1