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  2. List of railroad truck parts - Wikipedia

    en.wikipedia.org/wiki/List_of_railroad_truck_parts

    An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.

  3. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    The tip of the gimlet bit acts as a tapered screw, to draw the bit into the wood and to begin forcing aside the wood fibers, without necessarily cutting them. The cutting action occurs at the side of the broadest part of the cutter. Most drill bits cut the base of the hole. The gimlet bit cuts the side of the hole.

  4. Drill - Wikipedia

    en.wikipedia.org/wiki/Drill

    A drill press Drill press (then called a boring machine) boring wooden reels for winding barbed wire, 1917. A drill press (also known as a pedestal drill, pillar drill, or bench drill) is a style of drill that may be mounted on a stand or bolted to the floor or workbench. Portable models are made, some including a magnetic base.

  5. Machine taper - Wikipedia

    en.wikipedia.org/wiki/Machine_taper

    Tools with an R8 taper are inserted directly into the machine's spindle. R8 collets are typically used to hold tooling with round shanks, although any shape can be held if the collet has the corresponding shape cut in it. The collets have a precision bore with axial compression slots for holding cutting tools and are threaded for the drawbar.

  6. Drilling - Wikipedia

    en.wikipedia.org/wiki/Drilling

    Cutting fluids are not used or needed. The main issue in drilling wood is ensuring clean entry and exit holes and preventing burning. Avoiding burning is a question of using sharp bits and the appropriate cutting speed. Drill bits can tear out chips of wood around the top and bottom of the hole and this is undesirable in fine woodworking ...

  7. Crane (machine) - Wikipedia

    en.wikipedia.org/wiki/Crane_(machine)

    Cranes are commonly employed in transportation for the loading and unloading of freight, in construction for the movement of materials, and in manufacturing for the assembling of heavy equipment. The first known crane machine was the shaduf , a water-lifting device that was invented in ancient Mesopotamia (modern Iraq) and then appeared in ...

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