GBC Usp13 User Manual
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10
GENERAL RULES FOR GRINDING
PUNCHING PINS OF PUNCHING TOOLS
IT IS ALSO NECESSARY TO SHARPEN THE FEMALE PORTION (BOTTOM PLATE) OF THE PUNCHING
TOOL. SURFACE GRIND THE TOP OF THE BOTTOM PLATE UNTIL THE EDGES OF THE HOLES ARE
SHARP. THIS WILL REQUIRE APPROXIMATELY .005” OF STOCK REMOVAL. NOTE: IF THE PINS ARE
SHARPENED EVERY 100 HOURS, THE BOTTOM PLATE MAY ONLY HAVE TO BE SHARPENED EVERY
SECOND OR THIRD TIME THE PINS ARE SHARPENED.
All punching tools must be sharpened every 100 hours
of operation or sooner, depending on abrasiveness of
stock being punched.
IMPORTANT
Sharp punching tools are necessary to produce clean
holes, which are essential to maintain high binding
production and the prevention of premature wear of
punching tools.
In general, the diameter of the grinding wheel surface
should equal approximately 1
1
/
2
times the diameter of
round punching pins; or, 1
1
/
2
times the widest cutting
surface of rectangular punching pins. (See diagrams
below).