Cutter Blade Maintenance - K Jaws; Blade-To-Blade Clearance; Piercing Tip To Tunnel Gap - NPK M20S Instruction Manual

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).
(With weld-on piercing tip)
Fig. 2
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)
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