A vacuum is the state in a space which is free of matter In practice we already call it a vacuum when the air pressure in a space is less than that of the atmosphere.

A vacuum is the state in a space which is free of matter In practice we already call it a vacuum when the air pressure in a space is less than that of the atmosphere. Units of measurement used The most common units are the pascal and the bar. 100 Pa 1 hPa 1 hPa 1 mbar 1 mbar 0001 bar Vacuum clamping systems Vacuum clamping systems are used above all in the wood plastics and non-ferrous metals industries for quick simple machining they are compatible with CNC machine tools. here vacuum technology is used in connection with special handling systems for example in order to fix an aluminium plate and machine it from all sides. This increases productivity and cost-effectiveness the fixing does not cause any damage to the workpiece and no laborious time-consuming aligning of the workpiece is required. The latest clamping systems allow attachments of various sizes and shapes to be exchanged in a very short time thus facilitating flexible handling of a wide range of workpiece shapes. What does vacuum clamping mean In vacuum clamping an underpressure is generated under the workpiece being clamped i.e. a pressure differential is created which presses the workpiece against the clamping plate. thus the workpiece is not as one might think actually "sucked" but is rather pressed against the vacuum table. The sliding force of the workpiece depends on its surface structure the pressure differential and the area on which the vacuum acts. the larger this area is the better the holding forces Why does a vacuum generate a holding force All surfaces of an object are subjected to an even pressure of approx. 1 bar by the surrounding atmosphere. the integrated Venturi nozzle or an external vacuum pump then removes some of the air from under the workpiece being held thus removing part of the pressure load on that surface. What remains is a one-sided pressure on the top surface of the workpiece whose size depends on the degree of the vacuum. Generally it is 0.7 - 0.8 bar. this means for example that a vacuum of 200 mbar (absolute pressure) is generated. The pressure differential acting on the workpiece is therefore 800 mbar (approx. 0.8 kp cm2). The size of the clamping force is then only dependent on the clamping area. Calculation formula Force pressure x area F (n) bar x a(m2) x 105 1 bar 10 N cm2 The benefits of AMF vacuum clamping technology 1. The AMF vacuum clamping plate can be operated using compressed air and the integrated Venturi nozzle or with an external vacuum pump 2. The height-adjustable eccentric stops absorb the sliding forces and can be adjusted individually to the workpiece height 3. Easy positioning of workpieces by fastening with stop pins. these also absorb the sliding forces 4. Irregularities in the workpiece surface are compensated for by the sealing cord. The workpiece contour can be represented optimally using the grid pattern on the plate 5. Lateral grooves allow the vacuum clamping plate to be fastened to a baseplate or onto the machine table using clamps 6. Fixtures can be positioned on the vacuum clamping plate with a precision of 0.01 mm using one locating pin and one diamond pin each 7. The sound absorber is integrated into the vacuum clamping plate. We offer two different versions of the sound absorber (7800VSDI and 7800VSD) depending on the specific application Depending on the size of the clamping plate workpieces can be clamped using more than one suction point. This can also be used to clamp multiple workpieces - even different ones. 9. For efficient changing of the vacuum clamping plate it can be used in combination with the AMF Zero-point clamping system. This minimises setup times and increases machine runtime 368 NORGAU Clamping Tools VACUUM CLAMPING TECHNOLOGY What is a vacuum