- Vacuum clamping holds workpieces over a large area by means of negative pressure.
- Ideal for thin, sensitive, and non-magnetic parts (aluminum, plastic, non-ferrous metals).
- Low-distortion, with a freely accessible top side.
What is vacuum clamping?
In vacuum clamping, a workpiece is held on a suction plate or vacuum plate by negative pressure. A vacuum pump generates negative pressure between the plate and the workpiece; atmospheric pressure presses the workpiece onto the support surface over its full area.
How does a vacuum chuck work?
The area beneath the workpiece is sealed by gaskets or a porous suction surface. The holding force results from the negative pressure achieved multiplied by the effective suction area — the larger the sealed area, the higher the holding force.
When is vacuum clamping the right choice?
Especially for thin workpieces that are prone to bending or for sensitive surfaces: the force is applied over a large area, the workpiece hardly distorts, and the entire top side remains freely accessible. Typical materials are aluminum, plastics, glass, and other non-magnetic materials.
Limitations and requirements
The workpiece must rest on the support sufficiently flat and with an adequate seal. Porous or highly permeable workpieces require special suction plates or aids. The holding force is limited by the negative pressure and the area — this must be taken into account when machining forces are high.
Frequently asked questions
Which materials is vacuum clamping suitable for?
Primarily for non-magnetic and sensitive materials such as aluminum, plastics, non-ferrous metals, or glass — wherever magnetic clamping is not possible and distortion is to be avoided.
Can porous workpieces be vacuum clamped?
Only to a limited extent: porous or permeable workpieces lose vacuum. Special suction plates, sealing films, or adapted supports can help here.
