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Some 2-hole punches have an "888" marking on their paper guide, to assist punching all four holes into A4 paper. [ 5 ] Konica Minolta specifies that for European 4-hole arrangements, all holes should be 11 ± 1 mm from the nearest (i.e. long/spine) edge of the paper, [ 6 ] which is slightly at variance with ISO 838's specification of 12 ± 1 mm .
In bulk applications, a paper drilling machine may be used. Then the user chooses a spine size that will match the document. Standard sizes are 4.8 mm (3 ⁄ 16 in) (for 16 sheets of 20# paper) up to 51 mm (2 in) (for 425 sheets). Spine lengths are generally 280 mm (11 in) to match the length of letter-size paper.
The punch force required to punch a piece of sheet metal can be estimated from the following equation: [4] F = 0.7 t L ( U T S ) {\displaystyle F=0.7tL(UTS)} Where t is the sheet metal thickness, L is the total length sheared (perimeter of the shape), and UTS is the ultimate tensile strength of the material.
Paper drill bits are available for different hole sizes and in different coating qualities. Unlike hole punching, where only one or a few sheets may be processed, a large number of sheets can be processed with a paper-drilling machine. Depending on the type of paper drill, either the paper drill bits are lowered into the pile or the table is ...
Punched pockets are made in several sizes, with the most prevalent being A4 (210 mm × 297 mm; 8.3 in × 11.7 in) for Europe, or 8.5 by 11 inches (216 by 279 mm) for the United States. Depending on the location of the opening, punched pockets may be top-loading or side-loading which dictates how the document is inserted into the pocket.
The punch-bowl was an indispensable vessel in every house above the humblest class. And there were many kindly recollections connected with it, it being very frequently given as a present. No young married couple ever thought of buying a punch-bowl; it was always presented to them by a near-relative. [6] A glass punch bowl with serving ladle.