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This is an accepted version of this page This is the latest accepted revision, reviewed on 5 February 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors, cupboard ...
Contains a spindle to which the crankset is attached and the bearings themselves. There is a bearing surface on the spindle, and on each of the cups that thread into the frame. The bottom bracket may be overhaulable (an adjustable bottom bracket) or not overhaulable (a cartridge bottom bracket).
The spindle was common at least as early as the 17th century in Western Europe as an element of chair and table legs, stretchers, candlesticks, balusters, [1] and other pieces of cabinetry. By definition, the axis of a spindle is straight; hence, for example, a spindle-legged chair is a straight-legged design, even though cylindrical symmetry ...
Some axles have integrated cam levers that compress axle elements against the fork leg to lock it in place, while others rely on pinch bolts on the fork leg to secure it. Diameters for front thru axles include 20 mm, 15 mm, 12 mm, and 9 mm. Rear axles typically have diameters of 10 or 12 mm.
A machine tool may have several spindles, such as the headstock and tailstock spindles on a bench lathe. The main spindle is usually the biggest one. References to "the spindle" without further qualification imply the main spindle. Some machine tools that specialize in high-volume mass production have a group of 4, 6, or even more main spindles.
It is typically positioned on the bottom of the spindle. The spinner spins the weighted spindle pulling off a mass of fibers which is twisted into yarn. Historically, whorls have been made of materials like amber, antler, bone, ceramic, coral, glass, stone, metal (iron, lead, lead alloy), and wood .