Engineer’s bench vise or fitter’s vise – image inset shows soft jaws
Without qualification, “vise” normally refers to a bench vise with flat, parallel jaws, attached to a workbench. There are two principal kinds: a woodworking vise and engineer’s vise. The woodworker’s bench vise major characteristic is its integration into the bench. An engineer’s bench vise is typically clamped or bolted onto the best of the bench.
For woodworking, the jaws are made of wood, plastic or from metal, in the latter case they are generally faced with wood to stay away from marring the operate piece. The best edges of the jaws are normally brought flush with the bench prime by the extension of the wooden face above the leading of the iron moveable jaw. This jaw could include a dog hole to hold a bench dog. In contemporary metal woodworkers’ vises, a split nut is frequently utilized. The nut in which the screw turns is in two components so that, by implies of a lever, it can be removed from the screw and the moveable jaw can be quickly slid into a suitable position at which point the nut is again closed onto the screw so that the vise may possibly be closed firmly onto the function.
Machine vise – mill
Modest machine vise – drill
For metalworking, the jaws are produced of metal which may be hardened steel with a coarse gripping finish. Fast modify removable soft jaws are becoming used much more frequently to accommodate quickly alter-more than on set-ups. They are also kept for use where suitable, to protect the perform from harm.
Metalworking bench vises, recognized as engineers’ or fitters’ vises, are bolted onto the best surface of the bench with the face of the fixed jaws just forward of the front edge of the bench. The bench height need to be such that the best of the vise jaws is at or just beneath the elbow height of the user when standing upright. Where several folks use the 1 vise, this is a excellent guide.
The nut in which the screw turns could be split so that, by indicates of a lever, it can be removed from the screw and the screw and moveable jaw swiftly slid into a suitable position at which point the nut is again closed onto the screw. Many fitters favor to use the greater precision obtainable from a plain screw vise. The vise may incorporate other characteristics such as a small anvil on the back of its body.
Vise screws are generally either of an Acme thread type or a buttress thread. Those with a rapid-release nut use a buttress thread.
In higher production machine perform, work should be held in the identical location with great accuracy, so CNC machines may possibly perform operations on an array of vises. To assist this, there are numerous machine-shop certain vises and vise accessories.
Difficult and soft machine jaws have a quite important distinction amongst other metalworking vise jaws. The jaws are precision ground to a quite flat and smooth surface for accuracy. These rely on mechanical stress for gripping, instead of a rough surface. An unskilled operator has the tendency to over-tighten jaws, top to portion deformation and error in the finished workpiece. The jaws themselves come in a selection of hard and soft jaw profiles, for numerous work wants. 1 can purchase machinable soft jaws, and mill the profile of the component into them to speed portion set-up and remove measurement. This is most typically completed in gang operations, discussed below. For rectangular components getting worked at 45 degree angles, prismatic challenging jaws exist with V grooves cut into them to hold the component. Some vises have a hydraulic or pneumatic screw, generating setup not only quicker, but much more accurate as human error is lowered.
For massive parts, an array of normal machine vises might be set up to hold a portion that is also lengthy for one vise to hold. The vises’ fixed jaws are aligned by indicates of a dial indicator so that there is a widespread reference plane for the CNC machine.
For several components, many choices exist, and all machine vise producers have lines of vises available for higher production function.
The first step is a two clamp vise, where the fixed jaw is in the center of the vise and movable jaws ride on the identical screw to the outside.
The subsequent step up is the modular vise. Modular vises can be arranged and bolted together in a grid, with no space between them. This permits the greatest density of vises on a given perform surface. This style vise also comes in a two clamp assortment.
Tower vises are vertical vises used in horizontal machining centers. They have 1 vise per side, and come in single or dual clamping station varieties. A dual clamping tower vise, for instance, will hold eight relatively huge parts without having the need to have for a tool change.
Tombstone fixtures follow the exact same theory as a tower vise. Tombstones enable four surfaces of vises to be worked on 1 rotary table pallet. A tombstone is a big, correct, hardened block of metal that is bolted to the CNC pallet. The surface of the tombstone has holes to accommodate modular vises across all four faces on a pallet that can rotate to expose those faces to the machine spindle.
New operate holding fixtures are becoming available for five-axis machining centers. These specialty vises let the machine to work on surfaces that would typically be obscured when mounted in a classic or tombstone vise setup.
Other sorts of vise include:
machine vises – drill vises (lie flat on a drill press bed). Vises of the very same common kind are employed also on milling machines and grinding machines.
compound slide vises are a lot more complex machine vises. They allow speed and precision in the placement of the operate.
cross vises, which can be adjusted employing leadscrews in the X and Y axes these are valuable if several holes want to be drilled in the very same workpiece using a drill press. Compare router table.
sine vises, which use solving triangles and gauge blocks to set up a very accurate angle
pin vises (for holding thin, long cylindrical objects by a single end)
jewellers’ vises and by contrast
leg vises, which are attached to a bench but also supported from the ground so as to be steady under the extremely heavy use imposed by a blacksmith’s perform.
Appear up vise in Wiktionary, the totally free dictionary.
^ Haan, E. R. (October 1954), “Selecting and employing a bench vise”, Well-liked Mechanics 102 (4): 233235, ISSN 0032-4558, http://books.google.com/books?id=xNwDAAAAMBAJ&pg=PA233.
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