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  2. Metate - Wikipedia

    en.wikipedia.org/wiki/Metate

    This action consists of a horizontal grinding motion that differs from the vertical crushing motion used in a mortar and pestle. The depth of the bowl varies, though they are typically not deeper than those of a mortar; deeper metate bowls indicate either a longer period of use or greater degree of activity (i.e., economic specialization).

  3. Lapping - Wikipedia

    en.wikipedia.org/wiki/Lapping

    Lapping machine. Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine.. Lapping often follows other subtractive processes with more aggressive material removal as a first step, such as milling and/or grinding.

  4. Three roll mill - Wikipedia

    en.wikipedia.org/wiki/Three_roll_mill

    The three adjacent rolls of a three roll mill (called the feed roll, centre roll and apron roll) rotate at progressively higher speeds. Material, usually in the form of paste, is fed between the feed roll and the center roll. Due to the narrowing space between the rolls, most of the paste initially remains in the feed region.

  5. Grinding (abrasive cutting) - Wikipedia

    en.wikipedia.org/wiki/Grinding_(abrasive_cutting)

    A man grinding on metal using an angle grinder, causing a lot of sparks. Grinding is a type of abrasive machining process which uses a grinding wheel as cutting tool. A wide variety of machines are used for grinding, best classified as portable or stationary: Portable power tools such as angle grinders, die grinders and cut-off saws

  6. Mortar and pestle - Wikipedia

    en.wikipedia.org/wiki/Mortar_and_pestle

    A mortar and pestle is a set of two simple tools used to prepare ingredients or substances by crushing and grinding them into a fine paste or powder in the kitchen, laboratory, and pharmacy. The mortar (/ ˈ m ɔːr t ər /) is characteristically a bowl, typically made of hardwood, metal, ceramic, or hard stone such as granite.

  7. Centerless grinding - Wikipedia

    en.wikipedia.org/wiki/Centerless_grinding

    A schematic diagram of the centerless grinding process. Centerless grinding is a machining process that uses abrasive cutting to remove material from a workpiece. [1] Centerless grinding differs from centered grinding operations in that no spindle or fixture is used to locate and secure the workpiece; [2] the workpiece is secured between two rotary grinding wheels, and the speed of their ...

  8. Cylindrical grinder - Wikipedia

    en.wikipedia.org/wiki/Cylindrical_grinder

    Cylindrical grinding is defined as having four essential actions: The work (object) must be constantly rotating; The grinding wheel must be constantly rotating; The grinding wheel is fed towards and away from the work; Either the work or the grinding wheel is transversed with respect to the other.

  9. Mower blade - Wikipedia

    en.wikipedia.org/wiki/Mower_blade

    The first known lawn mower had a cylinder cutting gear made of iron. [citation needed] It was used to mow sporting grounds and wide-ranging gardens.As manufacturers changed the design and structure of mowers, the cutting mechanism also developed and evolved into several varieties, including cylinder/reel blades, deck blades, mulching blades, and lifting blades.