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Defining basic perforation patterns
Requirements which are not covered by or do not conform to the criteria below should always be specified by submitting a drawing of the full sheet, with unperforated margins clearly marked, together with details of the required perforated pattern and its orientation relative to the sheet.
The basic perforation patterns most commonly used can be defined by determining the following criteria:
Length (of sheet/plate) = will always be taken to be the longer of the two dimensions
Width or height (of sheet/plate) = the shorter of the two dimensions
Pitch = measurement from the centreline of one hole to the centreline of the next hole
Bridge = measurement from the edge of one hole to the edge of the adjacent hole – ie the amount of solid material between holes
Hole Pattern & Pitch
Following the code for hole shape and size, the pattern is specified using codes for arrangement (pattern) and spacing between hole centres (pitch)
For the T pattern (60º staggered pitch) and square U pattern (pitches equal in both directions), only the pitch p is stated.
For shapes R, C, CD, and H in the U or Z arrangements, both pitch p1 & p2 are stated as p1 x p2 with the shorter pitch p1 stated first.
If relevant to the requirement, the pattern should be defined further by specifying whether the straight row of holes should run parallel to the long side or short side of the panel.
Plain Margins should be specified along long and short sides of the panel, or each panel side if the margins or sides are not symmetrical about the centre lines of the panel.
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