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A twin-screw vise. A twin-screw vise allows for secure clamping of larger workpieces. The design was popular during the late eighteenth and early nineteenth centuries, particularly with chair makers. A modern evolution connects the screws with a chain, keeping them slaved together and turned by either handle.
A bench vise, B machine vise, C hand vise. A vise or vice (British English) is a mechanical apparatus used to secure an object to allow work to be performed on it.Vises have two parallel jaws, one fixed and the other movable, threaded in and out by a screw and lever.
Irwin Industrial Tools is an American manufacturer and distributor of hand tools and power tool accessories. It is owned by Stanley Black & Decker . It is best known for producing Vise-Grip locking pliers .
This property is also the basis for the use of screws in screw top container lids, vises, C-clamps, and screw jacks. A heavy object can be raised by turning the jack shaft, but when the shaft is released it will stay at whatever height it is raised to. A screw will be self-locking if and only if its efficiency is below 50%.
For example, a bench vise consists of a lever (the vise's handle) in series with a screw, and a simple gear train consists of a number of gears (wheels and axles) connected in series. The mechanical advantage of a compound machine is the ratio of the output force exerted by the last machine in the series divided by the input force applied to ...
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