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A wet grinder is a grinder that utilizes water either to soften the product grinded or to keep the grinding elements cool. There are two main category of uses of wet grinders, Industrial and Household. Most of the grinding processes generates a lot of heat and this heat may be detrimental for the machine as well as the products being ground. Generally, wet grinding is synonymous with water, although some processes use vegetable oil (or other high flash point oils) instead as it provides better lubrication as well as escapes the corrosive properties of water.

Industrial Grinders [link]

Household Grinders [link]

Electric-powered wet grinder

Wet grinding is not very common in western cuisine but is very popular in Indian kitchens and grinders are used to make pastes from grains and lentils. These grinders generally consists of a few stone plates that are rolled again and again another stone plate with the items to be grinded between them. Generally, wet grinding is considered advantageous over mixers or blenders because the stone grinder does not generate a lot of heat, which can change the flavor of the food and also, the stones don't lose their sharpness as quickly as metal blades giving wet grinders a longer life.

Traditional wet grinding stone

History [link]

Historically, a wet grinder would be of two types:

• Mortar & Pestle (Kundi-Sotta)
• Flat Stone (Sil-Batta)

The evolution of grinders has seen a dramatic change in their working. The earlier form of wet grinder, used mechanical energy in which the user had to rotate the top stone, to grind the medium. The harnessing of electricity led to the development of electric-powered wet grinders. By this invention, the powered wet grinders have both the top and the base stone rotating. These electric models were first introduced in restaurants, and later moved into homes.

Most modern models still have stone components for the grinding action. The stone is usually granite. The old manual grinding stones used to be refinished for better results. Modern stones usually don't need refinishing, as they last much longer. The wet grinder industry is largely confined to Coimbatore because the stone used is exclusively available only in this region. ^[1] The Indian government is planning to get Geographical Indication for Coimbatore wet grinders.^[2]

References [link]