Page "Plotter" Paragraph 45
from
Wikipedia
The surface of the table has a series of small pinholes drilled in it.
Material is placed on the table, and a coversheet of plastic or paper is overlaid onto the material to be cut.
A vacuum pump is turned on, and air pressure pushes down on the coversheet to hold the material in place.
The table then operates like a normal vector plotter, using various cutting tools to cut holes or slits into the fabric.
The coversheet is also cut, which may lead to a slight loss of vacuum around the edges of the coversheet, but this loss is usually not significant.
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