He constructed a case from a titanium-aluminum alloy, the same material Airbus uses for jet turbine blades, added a ceramic bezel shaped like an airplane window, and then replaced Richard Mille's signature screws with Torq-Set screws used by Airbus.
|
|
There are exceptions. Carriage bolts have a domed head that is not designed to be driven. Set screws often have a head smaller than the outer diameter of the screw. Headless set screws are also called grub screws.
|
|
The use of keys and keyways instead of, or in combination with, set screws is common for applications requiring high torque resistance or transmission. Splines offer yet more strength. For longer life, set screws are usually made of alloy steel and case hardened. Hardened set screws often leave a plastic deformation, in the form of a circular or semicircular mark, in the shaft that the screw sets against.
|
|
The operator can often feel the screw push the flat into final alignment as they make the last half- or quarter-turn that tightens the screw. Set screws can successfully hold against heavy-torque applications if the details are right. For example, endmill holders of the solid type typically use large set screws holding against flats to fasten the endmill, and heavy loads are resisted. However, small set screws without flats are prone to spinning and galling if overloaded.
|
|
Hallowell does describe, however, the same inspiration also mentioned in connection with Allen for a wave of adoption of the hex socket head, beginning with set screws and followed by cap screws. This was an industrial safety campaign, part of the larger Progressive Movement, to get headless set screws onto the pulleys and shafts of the line shafting that was ubiquitous in factories of the day. The headless set screws would be less likely to catch the clothing of workers and pull them into injurious contact with the running shaft. SPS at the time was a prominent maker of shaft hangers and collars, the latter of which were set in place with set screws.
|
|
Part 5 defines the mechanical properties for set screws and other fasteners not under tensile stresses. It defines properties for sizes M1.6 through M24.
|
|
The concept of set screws is centuries old, predating the metal screw by at least several hundred years. Early materials included wood, bone, horn, antler and ivory. Headless set screws have been around for a long time, with the straight slot being the oldest drive type (due to its ease of machining), but the demand for headless set screws experienced a marked increase in the first and second decades of the 20th century, when a penchant for better industrial safety, a campaign with the slogan "safety first",. swept the industrialized nations of North America and Europe as a part of the larger Progressive Movement.
|
|
Part 1 does not specify properties for fasteners that have head geometries that reduce the shear strength of the fastener, such as low head screws and countersunk heads. It also excludes set screws, which are covered under part 5.
|
|
Fittings used for strong structures are galvanised malleable iron castings, and come in many styles such as elbows, tees, crosses, reducers and flanges. The fittings are not threaded; they simply lock onto the pipe with the supplied hex set screws.
|
|
Thus a retailer could stock a small number of expensive lenses that would fit a large number of camera brands using a selection of inexpensive adapters. Some T-mount lenses accept a T-adapter that lacks its threaded inner ring, and simply slides onto the T-mount lens. It is secured only by 3 set screws that match a channel on the lens barrel, such that the barrel is not deformed by the set screws and the adapter can therefore be removed with no damage. As a common mechanical interface, the T-mount allows components of various manufacturers to be interchanged and assembled.
|
|
Examples of set screws A set screw, also known as a blind screw or a grub screw, is a type of screw generally used to secure an object within or against another object, usually without using a nut (see bolts compared with screws). The most common examples are securing a pulley or gear to a shaft. Set screws are usually headless, meaning that the screw is fully threaded and has no head projecting past the thread's major diameter. If a set screw does have a head, the thread will extend all the way to the head (whereas a bolt might have an unthreaded shank between the head and thread).
|
|
Typically, the retainer for the seal ring might include set screws, a dent or slot drive, recesses for the spring and a snap ring to complete the assembly. In contrast, mating ring hardware might be only a pin or slot to prevent rotation. Corrosion is a major consideration when selecting seal hardware.
|
|
Eccentric bottom bracket on a Burley tandem bicycle held in place with two set screws The term is also used to refer to the device often used on tandem bicycles with timing chains, single-speed bicycles with a rear disc brake or an internal-geared hub, or any bicycle with vertical dropouts and no derailleur, to allow slight repositioning, fore and aft, of a bottom bracket to properly tension the chain. They may be held in place by a built-in wedge, set screws threaded into the bottom bracket shell, or pinch bolts that tighten a split bottom bracket shell. As a standard sized bottom bracket threads into the eccentric, an oversized bottom bracket shell is required to accommodate the eccentric.
|
|
This surge in safety consciousness was a backlash against the often-atrocious industrial safety standards of the era. H.T. Hallowell, Sr., a U.S. industrialist whose corporation was one of several that pioneered the commercialization of the hex socket drive, noted in his memoir that line shafting, which was ubiquitous in the industrial practice of the time, often had headed set screws (with external-wrenching square drive) holding the many pulleys to the line shafts, and collars holding the shafts from axial movement. Gear trains of exposed gears were also common at the time, and those, too, often used headed set screws, holding the gears to the shafts. His company's chief products at the time were shaft hangers and shaft collars of pressed-steel construction.
|
|
Set screws and similar threaded fasteners not under tensile stresses. 6\. Nuts with specified proof load values - Fine pitch thread. 7\. Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm. With exception to part 7, which defines test standards, the parts of this standard define properties for fasteners made of carbon steel and alloy steel.
|
|
First, the grinding wheel is fed into the blank to the full thread depth. Then the blank is slowly rotated through approximately 1.5 turns while axially advancing through one pitch per revolution. Finally, the centerless thread grinding process is used to make head-less set screws in a similar method as centerless grinding. The blanks are hopper-fed to the grinding wheels, where the thread is fully formed.
|
|
All full sized models contain a dual head screw driver built into the recoil spring guide rod which fits all screws used in the pistol and serves as an emergency tool for performing field repairs. The nose of the magazine base plate serves as a wrench used to remove the castellated barrel bushing. Very early guns feature rear sights adjustable for windage with opposing tension set screws. Later guns have click adjustable rear sights.
|
|
The original net included a gold-plated copper band attached to the aluminum apex by four large set screws which supported eight closely spaced vertical points that did not protrude above the apex. In 1934 these eight short points were lengthened to extend them above the apex by .Gabriel Escobar, "Workers prepare to fill a tall order", Washington Post Tuesday, October 13, 1998, page B1. In 2013 this original system was removed and discarded.
|
|
Isometric projection of a grub screw with a hex socket head. Set screws are not always the best way to resist the torque of driven shafts. To reduce the chance of slipping and to increase load capacity, a detent (often called a "flat") may be milled or ground at the part of the shaft where the set screw's point contacts. The detent, however, must be closely aligned with the threaded hole prior to fastening.
|
|
The system comprises unthreaded cast iron or aluminium structural tubing and slip-on structural pipe fittings. The galvanized malleable fittings provide resistance to corrosion and are secured to the tubes using set screws by use of a hex key. Some cutting or bending of the tubes may be required while installing the system, according to site- specific circumstances. Skilled labourers such as welders are not required, but the material costs are higher for the Kee Klamp system.
|
|
This can especially happen if a 20 mm long plug is inserted into a socket that is only intended for 15 mm long plugs. Some banana plugs have exposed set screws that are electrically connected to the wire. When stacking plugs using transverse holes in a plug, large parts of the pin of the second plug are exposed. Another reason why banana connectors are not rated for mains usage is the lack of double insulation of wires and connectors.
|
|
The "stop" part comes from the fact that the string ends are held in place or they "stop" inside the bar. The bar is mounted on top of the guitar body usually by means of sturdy threaded metal studs screwed into threaded sleeves embedded into the body of the guitar. The studs and stopbar are located behind the separate bridge piece. The stopbar can either simply slip onto notches on top of the studs, or be held in place using set screws.
|
|
A selection of machine files Files are produced specifically for use in a filing machine, which is similar in appearance to a scroll saw with a vertically reciprocating file mounted in the middle of a table. A workpiece is manipulated around the file's face as the shape requires. A cone point (as pictured in the top and bottom files at left) allows a file to center itself in its mount. Files with flat mounting surfaces must be secured with set screws.
|
|
A sheave can also refer to a pulley which has an adjustable operating diameter for use with a mechanical belt. This is accomplished by constructing the pulley out of several pieces. The two main "halves" of the pulley can be moved closer together or farther apart, thus altering the operational diameter. The usual construction is some sort of locking collar or set screws to secure the components, one half with a threaded central shaft and one half with a threaded center.
|
|
If four 6 mm rods were secured on the corners, a second mounting plate could slide along the rods, and secured at any point via set screws. Furthermore, by securing individual lenses within each mounting plate, a telescope could be constructed. A larger system was introduced by Spindler & Hoyer for constructing larger optical experiments: Patent number 3,945,600 filed on Mar 23, 1976. This was called Macrobench which consisted of 150x150 mm mounting plates capable of securing up to 110 mm optical elements.
|
|
The heater is mounted on slim triangular chrome-plated legs, and has white handles to either side made from stay-cool compression-moulded urea-formaldehyde plastic. The internal components can be easily accessed by the removal of the four set- screws underneath the handles, after which the top grille and back panel simply lift off. Spacemasters were issued initially in a choice of so-called “Home & Garden” colours: Mocha, Flame, Clover Pink, Cloud Grey, and Gunmetal. In 1963, a black version was added to the range.
|
|
Because of the modular design of standard fittings, assembly is easy, only simple hand tools are required, and risks from welding a structure are eliminated. Other advantages of using structural pipe fittings are easy installation and reconfigurable design. Since there are no permanent welds in the structure, the set screws of the fittings can simply be loosened, allowing them to be repositioned. The project can be disassembled and stored if needed, or even taken apart with fittings and pipe recycled into a new project.
|
|
The "safety craze" created a burgeoning demand for headless set screws on pulleys, gears, and collars to replace the headed ones, so that workers' clothing and fingers were less likely to catch on the exposed rotating screw head. It was this heightened demand that prompted Hallowell's firm to get into the screw-making business and to explore socket-head drive designs. With P.L. Robertson holding fresh patent rights on a practical-to-make square-socket drive, the firm soon pursued the hex socket drive.
|
|
In pursuit of headless set screws with a better drive than a straight slot, Hallowell said, SPS had sourced set screws of square-socket drive from Britain, but they were very expensive.. (This was only 2 years after Robertson's Canadian patent.) This cost problem drove SPS to purchase its first screw machine and make its screws in-house, which soon led to SPS's foray into fastener sales (for which it later became well known within the metalworking industries). Hallowell said that "[for] a while we experimented with a screw containing a square hole like the British screw but soon found these would not be acceptable in this country [the U.S.]. Then we decided to incorporate a hexagon socket into the screw […].". Hallowell does not elaborate on why SPS found that the square hole "would not be acceptable in this country", but it seems likely that it would have to have involved licensing Robertson's patent, which would have defeated SPS's purpose of driving down its cost for internal-wrenching screws (and may have been unavailable at any price, as explained at "List of screw drives > Robertson").
|
|
One danger to be aware of is that the stopbar can fall out of the notches when changing strings and put a ding in the guitar's finish. When it is held in place using the screws, it is sometimes referred to as a "locking stopbar". In these designs, the Tune-o-matic bridge section is also usually fastened to its embedded studs by set screws. This fastening of the key components in a stoptail bridge system is claimed to impart more sustain and tone to the guitar's sound.
|
|
In addition to retaining the other components, the seal hardware includes the drive mechanism which is necessary to prevent axial and rotational slippage of the seal on the shaft. The drive mechanism must withstand the torque produced by the seal faces while also allowing the seal ring to move axially. In addition to torque, the drive mechanism must withstand the axial thrust produced by hydrostatic pressure acting on the components. The various types of drive mechanisms include: dent drive, key drive, set screws, pins, slots, snap rings and many more.
|
|
Tools of various kinds epitomize the kind of objects that subjects value instrumentally; themselves and certain other human beings epitomize the kind of objects that human subjects value intrinsically. Neither kind of valuing is normally done irrationally. A rational person does not typically value a speck of dust instrumentally; nor does a rational person typically value a plastic cup intrinsically. One values various things as tools for various reasons: drills because by their means one can make neat holes; screwdrivers because by their means one can set screws.
|
|
A similar design, sliding dropouts, uses detachable dropouts that are bolted to the frame through horizontal slots. This allows both quick release or bolt on hubs to be used, or through-axle hubs with the appropriate dropouts. Sliding dropouts usually have set screws that bear on the front of them through the frame to adjust their position for tensioning and wheel alignment. The main advantage of sliding dropouts over track ends is realized when they are used with disc brakes, as the brake caliper mount is part of the left dropout, and thus moves with the dropout, maintaining the hub to caliper distance.
|
|
The two telescopes in binoculars are aligned in parallel (collimated), to produce a single circular, apparently three-dimensional, image. Misalignment will cause the binoculars to produce a double image. Even slight misalignment will cause vague discomfort and visual fatigue as the brain tries to combine the skewed images.Stephen Mensing, Star gazing through binoculars: a complete guide to binocular astronomy, page 32 Alignment is performed by small movements to the prisms, by adjusting an internal support cell or by turning external set screws, or by adjusting the position of the objective via eccentric rings built into the objective cell.
|
|
The winding cone consists of holes every 90 degrees for winding the springs and two set screws to secure the springs to the shaft. Steel counterbalance cables run from the roller brackets at the bottom corners of the door to a notch in the cable drums. When the door is raised, the springs unwind and the stored tension lifts the door by turning the shaft, thus turning the cable drums, wrapping the cables around the grooves on the cable drums. When the door is lowered, the cables unwrap from the drums and the springs are rewound to full tension.
|
|
Fittings for non-threaded conduits are either secured with set screws or with a compression nut that encircles the conduit. Fittings for general purpose use with metal conduits may be made of die-cast zinc, but where stronger fittings are needed, they are made of copper-free aluminum or cast iron. Couplings connect two pieces of conduit together. Sometimes the fittings are considered sufficiently conductive to bond (electrically unite) the metal conduit to a metal junction box (thus sharing the box's ground connection); other times, grounding bushings are used which have bonding jumpers from the bushing to a grounding screw on the box.
|
|
The screws used in the Flexowriter were unique, having large flat heads with a very narrow screwdriver slot and a unique thread size and pitch. This may have been a conscious decision. Another reader found that standard 4-40UNC threads appear to fit some of the cover-attachments; internally, the headless set-screws require fluted Bristol keys, which are not commonly available in Great Britain. There is a holder for a large roll of paper tape on the back of the unit, with tape feeding around to a punch on the left side, toward the rear.
|
|
The screw terminals are hollow and allow up to at least three 1 mm (CSA) wires, twisted together, to be inserted to a depth of up to and secured with a set screw. The contact terminal set screws are installed at a slight angle to allow easier screwdriver access after the switch mechanism has been installed into a wall-plate - before fixing the wall-plate to the wall. Also shown is a "loop" connection terminal. This terminal plays no part in the action of the switch but, because there is available space, it is provided as an insulated terminal for joining other wires, if required (such as the neutral wires).
|
|
An eccentric is a cylindrical plug or bearing cup that fits into an enlarged bottom bracket shell. The plug is machined to accept a typical bottom bracket, but offset from the center of the plug, so that by rotating the plug, the location of the bottom bracket (and hence the chain tension) may be adjusted (fore and aft to tension the chain, the upper or lower eccentric position for a given chain length can be chosen to fine tune bottom bracket height). Once properly adjusted the plug is then fixed in place by a pair of set screws, a clamping bottom bracket shell, an expanding wedge in the plug, or the plug may be manufactured in left and right halves that clamp against the faces of the bottom bracket shell with screws that connect the two halves. Eccentric bottom bracket shell inner diameters vary between manufacturers from 42mm-55mm (nominally).
|
|