How often should the vacuum pads be replaced?

Vacuum pads should be regularly checked for deterioration signs. There is no specific advice on the frequency of vacuum pad exchange. This is because the frequency depends on several factors, such as surface roughness of the work piece, operating environment and operating conditions. 
Continuous use of the vacuum pad will cause wear and tear on the adsorption surface and the external dimension will gradually decrease, as well as lifting force.

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