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The holes are positioned symmetrically, with the centers 4 + 1 ⁄ 4 inches (108 mm) apart. It requires paper formats that are at least 9 + 1 ⁄ 2 inches (241 mm) high. There is a variant for half-letter size pages (8 + 1 ⁄ 2 by 5 + 1 ⁄ 2 inches or 220 mm × 140 mm), whose three holes are 2 + 3 ⁄ 4 inches (70 mm) apart.
At some point, 3 + 1 ⁄ 4 by 7 + 3 ⁄ 8 inches (83 by 187 mm) became the standard card size. These are the dimensions of the then-current paper currency of 1862–1923. [ 42 ] This size was needed in order to use available banking-type storage for the 60,000,000 punched cards to come nationwide.
Thus, the full constellation of punched holes is not needed, and only a single hole is retained, to indicate the start of the track (3 + 1 ⁄ 2-inch disks use an alignment pin rather than a hole). If the motor is spinning any slower than the highest acceptable speed, which is usually the case, the data will fit in fewer than 360 degrees ...
A 3/4 inch conduit size punch actually punches a hole that is approximately 1.1 inches diameter for 3/4 nominal size conduit. A dimensional size punch makes a hole very close to the indicated size. Punch sets are available on both imperial and metric sizes. Chassis punches are available in a number of shapes, round being the most common.
To bind a document, the user first punches holes in the paper with a specialized hole punch. Pages must be punched a few at a time with most of these machines. If hard covers are desired, they must be punched as well. In bulk applications, a paper drilling machine may be used. Then the user chooses a spine size that will match the document.
Usually, the punch and die are close to the same dimensions, creating a sheared edge when they meet. A punch that is significantly smaller than the die can be used to produce an extruded hole where the punch displaces the punched material to the sides, forming a tube perpendicular to the punched sheet. [2] [3]
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So, the 17-by-22-inch (432 by 559 mm) ream became commonly used. The 25-by-38-inch (635 by 965 mm) book-paper ream developed because such a size can easily be cut into sixteen 6-by-9-inch (152 by 229 mm) book sized sheets without significant waste (nominally 6 + 1 ⁄ 4-by-9 + 1 ⁄ 2-inch (159 by 241 mm) before trimming and binding).
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