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  2. Grindstone - Wikipedia

    en.wikipedia.org/wiki/Grindstone

    Aboriginal grinding grooves, or axe-grinding grooves, have been found across the Australian continent. [3] The working edge of the hatchet or axe was sharpened by rubbing it against an abrasive stone, eventually leading to the creation of a shallow oval -shaped groove over time, [ 4 ] The grooves vary in length from 80 mm (3.1 in) up to 500 mm ...

  3. Faceting machine - Wikipedia

    en.wikipedia.org/wiki/Faceting_machine

    First the rough stone is glued to the end of the dop. Once the glue or wax has set, the other end of the dop is inserted into the quill. The index is set to 64, which is the same as 0. The mineral in this example is quartz, so the first angle will be 45 degrees. This is set, and the quill is lowered to make sure it will stop at roughly 45 degrees.

  4. Millstone - Wikipedia

    en.wikipedia.org/wiki/Millstone

    The basic anatomy of a millstone. This is a runner stone; a bedstone would not have the "Spanish Cross" into which the supporting millrind fits. Millstones or mill stones are stones used in gristmills, used for triturating, crushing or, more specifically, grinding wheat or other grains. They are sometimes referred to as grindstones or grinding ...

  5. Valve job - Wikipedia

    en.wikipedia.org/wiki/Valve_job

    A valve job is the colloquial term for resurfacing the mating surfaces of the poppet valves and their respective valve seats that control the intake and exhaust of the air/fuel mixture in four stroke internal combustion engine, replacing valve oil seals, replacing any deficient valve springs, and otherwise bringing the components of a cylinder head up to manufacturer’s spec. [1] A ...

  6. Grinding slab - Wikipedia

    en.wikipedia.org/wiki/Grinding_slab

    Stone slab in east-central California used to grind acorns. In archaeology, a grinding slab is a ground stone artifact generally used to grind plant materials into usable size, though some slabs were used to shape other ground stone artifacts. [1] Some grinding stones are portable; others are not and, in fact, may be part of a stone outcropping.

  7. Metate - Wikipedia

    en.wikipedia.org/wiki/Metate

    A metate (or mealing stone) is a type or variety of quern, a ground stone tool used for processing grain and seeds. In traditional Mesoamerican cultures, metates are typically used by women who would grind nixtamalized maize and other organic materials during food preparation (e.g., making tortillas ).

  8. Quern-stone - Wikipedia

    en.wikipedia.org/wiki/Quern-stone

    Quern-stones are stone tools for hand-grinding a wide variety of materials, especially for various types of grains. They are used in pairs. The lower stationary stone of early examples is called a saddle quern, while the upper mobile stone is called a muller, rubber, or handstone. The upper stone was moved in a back-and-forth motion across the ...

  9. High-speed grinding - Wikipedia

    en.wikipedia.org/wiki/High-speed_grinding

    The grinding stones are mounted on grinding units hauled by a carrier vehicle. Two things are achieved with this motion: First, the required material removal rate is obtained through the relative motion between grinding stone and rail. Second, by rotating the stones, overheating, glazing and uneven wear of the stones is prevented. The usual ...

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