NPK M20C, Instruction Manual, Page: 65 / 152

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65
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GENERAL MAINTENANCE
CUTTER BLADE MAINTENANCE – K JAWS
BLADE-TO-BLADE CLEARANCE
M20K, M28K, and M38K
A blade-to-blade clearance of .000” to .010” (.00 to 0.25 mm) should be maintained for
optimum performance.
See Fig. 2 and 3 for cutting blade and shim arrangement. Refer to the NPK Parts
Manual for part numbers.
PIERCING TIP TO TUNNEL GAP
M20K, M28K, and M38K
The piercing tip to tunnel blade gap can be increased by removing the tunnel spacer,
which can be helpful in some piercing operations.
Removal of the spacer on the M20K increases the gap by .20 inch (5 mm) .
Removal of the spacer on the M28K increases the gap by .47 inch ( 12 mm ).
Removal of the spacer on the M20K increases the gap by .75 inch ( 19 mm ).
Fig. 2
(With weld-on piercing tip)
BD
ARM
BG PRIMARY CUTTING BLADE
BG1 SECONDARY CUTTING BLADE
BH SHIM PACK
(drive arm only)
BI
DRIVE ARM
DA PIERCING TIP (weld-on)
DB
TUNNEL BLADE
DC
SPACER
DE SPACER PLATE
DF GUIDE BLADE (not shown)