|How much holding power is available?
Vacuum cleaners produce a vacuum to about 9% of absolute vacuum. V-Clamps generate a vacuum pressure to 85% of absolute. A vacuum pressure like this means that when you use the full face of the clamp, 150 kg of air is pushing to hold your workpiece.
|What about smaller parts?
When smaller pieces are held, less surface area means less holding force. Indeed when using one third of a clamps surface the holding power is reduced by the same amount. So using one third of the face of the clamp, holding force would be about 50kg
|What if I am at a higher altitude?
At higher altitudes air pressure is less which means the holding force of a vacuum clamp reduces with altitude.If you intend to work at the summit of Mount Everest (8,854metres, 29,028ft) the holding force will be reduced from 150kg (330lbs) to 50kg force (110lbs)