| 摘要 |
A working hold-down system for a worktable of a machine tool having a wall member for supporting the workpiece, defining a plenum connectable to a vacuum source; a surface portion cooperable with the workpiece and a seal, defining a zone; a passageway intercommunicating the plenum with the zone; and a valve disposed in the passageway. In operation, the vacuum source generates a vacuum in the plenum connected to the zone by the passageway to hold down the workpiece on the worktable. The system further includes a fixture connectable to the wall member via the vacuum source having a surface that is cooperable with workpiece and the seal defining the zone. For large, flat workpieces, a porous spoilboard replaces the supporting wall member to create a universal hold-down system.
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