GBC Usp13 User Manual

Page 12

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

times the diameter of

round punching pins; or, 1

times the widest cutting

surface of rectangular punching pins. (See diagrams

below).