Matrix tableConstruction of a machine table for CNC-machining centres. ConstructionA matrix table comprises a support plate from plastic or phenolic resin- impregnated plywood. Grooves are milled into this support plate at regular intervals. Closable bores are located at somewhat greater distances in the plate. These are connected with the vacuum system. The matrix table can be combined with positioning aids such as crosshair lasers or contour lasers. Some manufacturers (e.g. SCM) offer aluminium matrix tables, whereby T-grooves are located at various points. Using these it is also possible to secure workpieces without a vacuum. FunctionIf a panel-type workpiece of an arbitrary form is to be clamped then a slightly smaller shape is placed in the grooves of the matrix table with a foam rubber belt. The ends of the rubber belt must meet such that the enclosed surface of the matrix table is sealed. At least one of the bores must be open within the sealed area. If a workpiece is now laid in place and the vacuum activated, the workpiece will be held fast. Some manufacturers also offer suction cups for use on matrix tables. These have a foot, which precisely fits into the table matrix. When the vacuum is activated the suction cup sucks the workpiece. Advantages
Disadvantages
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