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Gears of War ist ein Videospiel-Franchise, das von Epic Games entwickelt, von The Coalition entwickelt und verwaltet wird und im Besitz von Xbox Game Studios ist und von diesen veröffentlicht wird. Gears of War (kurz: GoW, nicht zu verwechseln mit God of War) ist ein Franchise, das auf einem durch Epic Games produzierten und im November durch. Buy Xbox - Controller Wireless "Gears of War 3" Limited Edition from barijbasics.nl Everyday low prices on a huge range of video game accessories. Are you a Gears of War 4 fan? Then this exclusive merchandise pack is for you! This GoW stuffed box comes with lap top stickers, a Phoenix Omen pin badge. Hol dir Gears of War 4 für Xbox One und Windows Leg mit explosiver Versus-​Multiplayer, neuen Gegnern und Verbündeten sowie brutalen.

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Xbox Game Pass Ultimate. Sichere dir Xbox Live Gold und unbegrenzten Zugriff auf über hochwertige Games für Konsole und PC, darunter die Gears 5. Gears of War ist ein Videospiel-Franchise, das von Epic Games entwickelt, von The Coalition entwickelt und verwaltet wird und im Besitz von Xbox Game Studios ist und von diesen veröffentlicht wird. barijbasics.nl ist die weltweit erste und damit älteste News-Community rund um Gears of War. Hier findest du als Fan alles, was dein Herz.

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Für die Nutzung der Leistungen ist ein gültiges Abonnement erforderlich. Controller feels great and works great. In dem neuen Video schauen die Entwickler auf November Xbox One: Nordamerika I purchased the 'new' version and it has not come boxed as is shown in the advertisement for purchase. A gear can mesh with a linear toothed part, called a rack, producing translation instead of rotation. Gears Arrow Online Anschauen War 3 is set two years after the COG disbanded. While behind cover, the player can fire blindly and inaccurately at their opponent, or can look around the Free On Slots and aim carefully, though exposing to enemy fire; the player can slide along cover, move between nearby cover, or vault over cover to race to a new point of cover. Whereas a regular nonhypoid ring-and-pinion gear set is suitable for many applications, it Whatsapp Spiele L not ideal for vehicle drive trains because it generates more noise and Gears Of than a Schweden Personalausweis does. For other Games For Free Online To Play, see Gear disambiguation. Third-person shooter. In the illustration, the sun is yellow, the planet red, the reciprocating arm is blue, the flywheel is green and the driveshaft is gray. Backlash is the error in motion that occurs when gears change direction. Wheel train.

Play as Jack: Play as Jack, your personal flying support bot that can protect allies and damage enemies - perfect for players new to Gears.

Rating Pending. User rating: 3. Join now! Up to 80 GB of storage required subject to change. Additional storage hardware, broadband ISP fees apply , Microsoft Account, and Xbox Live may be required for setup, some updates, and features, including retention of some gameplay settings and information xbox.

Features, online services, and system requirements vary by country and are subject to change or retirement over time. Features may vary between Xbox One and Windows 10 versions of the game.

Live Gold membership sold separately required for online multiplayer on Xbox One. Subject to Microsoft Services Agreement at microsoft. Skin and online multiplayer require Xbox Live Gold on console, membership sold separately.

Games information at xbox. Skip to main content. Trailers and gameplay. Operation 4 Brothers in Arms is live This new, free update brings the largest one-time drop of characters since launch and completes the original Delta Squad with Dom Santiago.

Gaming that is accessible for all Customize your gaming experience with updated accessibility features, including: full controller remapping, single stick movement, Adaptive Controller support, narrated UI and menus, improved subtitles and more.

Additional information Rating Pending May contain content inappropriate for children. Visit ESRB. Get the game. Storefronts Company Company. The gears in a transmission are analogous to the wheels in a crossed, belt pulley system.

An advantage of gears is that the teeth of a gear prevent slippage. When two gears mesh, if one gear is bigger than the other, a mechanical advantage is produced, with the rotational speeds , and the torques, of the two gears differing in proportion to their diameters.

In transmissions with multiple gear ratios—such as bicycles, motorcycles, and cars—the term "gear" as in "first gear" refers to a gear ratio rather than an actual physical gear.

The term describes similar devices, even when the gear ratio is continuous rather than discrete, or when the device does not actually contain gears, as in a continuously variable transmission.

The earliest preserved gears in Europe were found in the Antikythera mechanism , an example of a very early and intricate geared device, designed to calculate astronomical positions.

Its time of construction is now estimated between and BC. In this context, the meaning of 'toothed wheel in machinery' first attested s; specific mechanical sense of 'parts by which a motor communicates motion' is from ; specifically of a vehicle bicycle, automobile, etc.

A cog is a tooth on a wheel. Historically, cogs were teeth made of wood rather than metal, and a cogwheel technically consisted of a series of wooden gear teeth located around a mortise or mortice wheel, each tooth forming a type of specialised 'through' mortise and tenon joint.

The wheel can be made of wood, cast iron , or other material. Wooden cogs were formerly used when large metal gears could not be cut, when the cast tooth was not even approximately of the proper shape, or the size of the wheel made manufacture impractical.

The cogs were often made of maple wood. In the Thompson Manufacturing Company of Lancaster, New Hampshire still had a very active business in supplying tens of thousands of maple gear teeth per year, mostly for use in paper mills and grist mills , some dating back over years.

The definite ratio that teeth give gears provides an advantage over other drives such as traction drives and V-belts in precision machines such as watches that depend upon an exact velocity ratio.

In cases where driver and follower are proximal, gears also have an advantage over other drives in the reduced number of parts required.

The downside is that gears are more expensive to manufacture and their lubrication requirements may impose a higher operating cost per hour.

An external gear is one with the teeth formed on the outer surface of a cylinder or cone. Conversely, an internal gear is one with the teeth formed on the inner surface of a cylinder or cone.

For bevel gears , an internal gear is one with the pitch angle exceeding 90 degrees. Internal gears do not cause output shaft direction reversal.

Spur gears or straight-cut gears are the simplest type of gear. They consist of a cylinder or disk with teeth projecting radially. Though the teeth are not straight-sided but usually of special form to achieve a constant drive ratio, mainly involute but less commonly cycloidal , the edge of each tooth is straight and aligned parallel to the axis of rotation.

These gears mesh together correctly only if fitted to parallel shafts. Spur gears are excellent at moderate speeds but tend to be noisy at high speeds.

Helical or "dry fixed" gears offer a refinement over spur gears. The leading edges of the teeth are not parallel to the axis of rotation, but are set at an angle.

Since the gear is curved, this angling makes the tooth shape a segment of a helix. Helical gears can be meshed in parallel or crossed orientations.

The former refers to when the shafts are parallel to each other; this is the most common orientation. In the latter, the shafts are non-parallel, and in this configuration the gears are sometimes known as "skew gears".

The angled teeth engage more gradually than do spur gear teeth, causing them to run more smoothly and quietly. In spur gears, teeth suddenly meet at a line contact across their entire width, causing stress and noise.

Spur gears make a characteristic whine at high speeds. For this reason spur gears are used in low-speed applications and in situations where noise control is not a problem, and helical gears are used in high-speed applications, large power transmission, or where noise abatement is important.

A disadvantage of helical gears is a resultant thrust along the axis of the gear, which must be accommodated by appropriate thrust bearings.

However, this issue can be turned into an advantage when using a herringbone gear or double helical gear , which has no axial thrust - and also provides self-aligning of the gears.

This results in less axial thrust than a comparable spur gear. A second disadvantage of helical gears is also a greater degree of sliding friction between the meshing teeth, often addressed with additives in the lubricant.

For a "crossed" or "skew" configuration, the gears must have the same pressure angle and normal pitch; however, the helix angle and handedness can be different.

The relationship between the two shafts is actually defined by the helix angle s of the two shafts and the handedness, as defined: [22].

The crossed configuration is less mechanically sound because there is only a point contact between the gears, whereas in the parallel configuration there is a line contact.

Quite commonly, helical gears are used with the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a left-handed helix of equal angles.

The two equal but opposite angles add to zero: the angle between shafts is zero—that is, the shafts are parallel. Where the sum or the difference as described in the equations above is not zero, the shafts are crossed.

For shafts crossed at right angles, the helix angles are of the same hand because they must add to 90 degrees. This is the case with the gears in the illustration above: they mesh correctly in the crossed configuration: for the parallel configuration, one of the helix angles should be reversed.

The gears illustrated cannot mesh with the shafts parallel. Double helical gears overcome the problem of axial thrust presented by single helical gears by using a double set of teeth, slanted in opposite directions.

A double helical gear can be thought of as two mirrored helical gears mounted closely together on a common axle. This arrangement cancels out the net axial thrust, since each half of the gear thrusts in the opposite direction, resulting in a net axial force of zero.

This arrangement can also remove the need for thrust bearings. However, double helical gears are more difficult to manufacture due to their more complicated shape.

Herringbone gears are a special type of helical gears. They do not have a groove in the middle like some other double helical gears do; the two mirrored helical gears are joined together so that their teeth form a V shape.

For both possible rotational directions, there exist two possible arrangements for the oppositely-oriented helical gears or gear faces. One arrangement is called stable, and the other unstable.

In a stable arrangement, the helical gear faces are oriented so that each axial force is directed toward the center of the gear.

In an unstable arrangement, both axial forces are directed away from the center of the gear. In either arrangement, the total or net axial force on each gear is zero when the gears are aligned correctly.

If the gears become misaligned in the axial direction, the unstable arrangement generates a net force that may lead to disassembly of the gear train, while the stable arrangement generates a net corrective force.

If the direction of rotation is reversed, the direction of the axial thrusts is also reversed, so a stable configuration becomes unstable, and conversely.

Stable double helical gears can be directly interchanged with spur gears without any need for different bearings.

A bevel gear is shaped like a right circular cone with most of its tip cut off. When two bevel gears mesh, their imaginary vertices must occupy the same point.

Their shaft axes also intersect at this point, forming an arbitrary non-straight angle between the shafts.

The angle between the shafts can be anything except zero or degrees. Bevel gears with equal numbers of teeth and shaft axes at 90 degrees are called miter US or mitre UK gears.

Spiral bevel gears can be manufactured as Gleason types circular arc with non-constant tooth depth , Oerlikon and Curvex types circular arc with constant tooth depth , Klingelnberg Cyclo-Palloid Epicycloid with constant tooth depth or Klingelnberg Palloid.

Spiral bevel gears have the same advantages and disadvantages relative to their straight-cut cousins as helical gears do to spur gears. Note: The cylindrical gear tooth profile corresponds to an involute, but the bevel gear tooth profile to an octoid.

Hünecke, TU Dresden]. Furthermore, the "involute bevel gear sets" cause more noise. Hypoid gears resemble spiral bevel gears except the shaft axes do not intersect.

The pitch surfaces appear conical but, to compensate for the offset shaft, are in fact hyperboloids of revolution.

Depending on which side the shaft is offset to, relative to the angling of the teeth, contact between hypoid gear teeth may be even smoother and more gradual than with spiral bevel gear teeth, but also have a sliding action along the meshing teeth as it rotates and therefore usually require some of the most viscous types of gear oil to avoid it being extruded from the mating tooth faces, the oil is normally designated HP for hypoid followed by a number denoting the viscosity.

Also, the pinion can be designed with fewer teeth than a spiral bevel pinion, with the result that gear ratios of and higher are feasible using a single set of hypoid gears.

Whereas a regular nonhypoid ring-and-pinion gear set is suitable for many applications, it is not ideal for vehicle drive trains because it generates more noise and vibration than a hypoid does.

Bringing hypoid gears to market for mass-production applications was an engineering improvement of the s. Crown gears or contrate gears are a particular form of bevel gear whose teeth project at right angles to the plane of the wheel; in their orientation the teeth resemble the points on a crown.

A crown gear can only mesh accurately with another bevel gear, although crown gears are sometimes seen meshing with spur gears. A crown gear is also sometimes meshed with an escapement such as found in mechanical clocks.

Worms resemble screws. A worm is meshed with a worm wheel , which looks similar to a spur gear. Worm-and-gear sets are a simple and compact way to achieve a high torque, low speed gear ratio.

For example, helical gears are normally limited to gear ratios of less than while worm-and-gear sets vary from to A worm gear is a species of helical gear, but its helix angle is usually somewhat large close to 90 degrees and its body is usually fairly long in the axial direction.

These attributes give it screw like qualities. The distinction between a worm and a helical gear is that at least one tooth persists for a full rotation around the helix.

If this occurs, it is a 'worm'; if not, it is a 'helical gear'. A worm may have as few as one tooth. If that tooth persists for several turns around the helix, the worm appears, superficially, to have more than one tooth, but what one in fact sees is the same tooth reappearing at intervals along the length of the worm.

The usual screw nomenclature applies: a one-toothed worm is called single thread or single start ; a worm with more than one tooth is called multiple thread or multiple start.

The helix angle of a worm is not usually specified. Instead, the lead angle, which is equal to 90 degrees minus the helix angle, is given.

In a worm-and-gear set, the worm can always drive the gear. However, if the gear attempts to drive the worm, it may or may not succeed.

Particularly if the lead angle is small, the gear's teeth may simply lock against the worm's teeth, because the force component circumferential to the worm is not sufficient to overcome friction.

In traditional music boxes, however, the gear drives the worm, which has a large helix angle. This mesh drives the speed-limiter vanes which are mounted on the worm shaft.

Worm-and-gear sets that do lock are called self locking , which can be used to advantage, as when it is desired to set the position of a mechanism by turning the worm and then have the mechanism hold that position.

An example is the machine head found on some types of stringed instruments. If the gear in a worm-and-gear set is an ordinary helical gear only a single point of contact is achieved.

This is done by making both concave and joining them at a saddle point ; this is called a cone-drive [30] or "Double enveloping".

Worm gears can be right or left-handed, following the long-established practice for screw threads. Non-circular gears are designed for special purposes.

While a regular gear is optimized to transmit torque to another engaged member with minimum noise and wear and maximum efficiency , a non-circular gear's main objective might be ratio variations, axle displacement oscillations and more.

Common applications include textile machines, potentiometers and continuously variable transmissions. A rack is a toothed bar or rod that can be thought of as a sector gear with an infinitely large radius of curvature.

Torque can be converted to linear force by meshing a rack with a pinion: the pinion turns; the rack moves in a straight line.

Such a mechanism is used in automobiles to convert the rotation of the steering wheel into the left-to-right motion of the tie rod s.

Racks also feature in the theory of gear geometry, where, for instance, the tooth shape of an interchangeable set of gears may be specified for the rack, infinite radius , and the tooth shapes for gears of particular actual radii are then derived from that.

The rack and pinion gear type is employed in a rack railway. In epicyclic gearing one or more of the gear axes moves. Examples are sun and planet gearing see below , cycloidal drive , automatic transmissions , and mechanical differentials.

Sun and planet gearing is a method of converting reciprocating motion into rotary motion that was used in steam engines. James Watt used it on his early steam engines to get around the patent on the crank , but it also provided the advantage of increasing the flywheel speed so Watt could use a lighter flywheel.

In the illustration, the sun is yellow, the planet red, the reciprocating arm is blue, the flywheel is green and the driveshaft is gray.

A harmonic gear or strain wave gear is a specialized gearing mechanism often used in industrial motion control , robotics and aerospace for its advantages over traditional gearing systems, including lack of backlash, compactness and high gear ratios.

Though the diagram does not demonstrate the correct configuration, it is a "timing gear," conventionally with far more teeth than a traditional gear to ensure a higher degree of precision.

A cage gear , also called a lantern gear or lantern pinion , has cylindrical rods for teeth, parallel to the axle and arranged in a circle around it, much as the bars on a round bird cage or lantern.

The assembly is held together by disks at each end, into which the tooth rods and axle are set. Cage gears are more efficient than solid pinions, [ citation needed ] and dirt can fall through the rods rather than becoming trapped and increasing wear.

They can be constructed with very simple tools as the teeth are not formed by cutting or milling, but rather by drilling holes and inserting rods.

Sometimes used in clocks, the cage gear should always be driven by a gearwheel, not used as the driver.

The cage gear was not initially favoured by conservative clock makers. It became popular in turret clocks where dirty working conditions were most commonplace.

Domestic American clock movements often used them. All cogs of each gear component of magnetic gears act as a constant magnet with periodic alternation of opposite magnetic poles on mating surfaces.

Gear components are mounted with a backlash capability similar to other mechanical gearings. Although they cannot exert as much force as a traditional gear, such gears work without touching and so are immune to wear, have very low noise and can slip without damage making them very reliable.

Xbox Game Pass Ultimate. Sichere dir Xbox Live Gold und unbegrenzten Zugriff auf über hochwertige Games für Konsole und PC, darunter die Gears 5. barijbasics.nl: Gears of War: Retrospective (): The Coalition, Microsoft Studios, Arthur Gies: Books. barijbasics.nl ist die weltweit erste und damit älteste News-Community rund um Gears of War. Hier findest du als Fan alles, was dein Herz. Erleben Sie eine spannende Co-op-Kampagne für zwei Spieler zusammen mit Ihren Freunden, via Splitscreen oder Xbox Live. Die Horde kehrt zurück. In Gears​. Gears of War 4 jetzt online bestellen. ✓ Versandkostenfrei ab 50€ ✓ Kostenlos abholen im Store.

Gears Of Video

Gears of War: Ultimate Edition All Cutscenes Remastered (Game Movie) Full Story 1080p HD Controller feels great and works great. Der zweite Spieler übernimmt dabei die Rolle von Dominic Santiago, der Marcus Fenix auch Cinemaxx Am Raschplatz im Spiel begleitet, wenn nur ein menschlicher Spieler aktiv ist. Gears of War 2. I remember I used press and see in the screen that I am switching between grenades and gun, that is annoying in middle of intense multiplayer game. Audible Download Audiobooks. Try again. It also analyses reviews to verify trustworthiness. Sell on Amazon. Ist deine Aktion Gears Of, erledigst du den Gegner mit dem Messer. Der Controller war in einem klasse Zustand. Bought this as a gift to replace a broken Ways To Last Longer. Erstveröffent- lichung.

User rating: 3. Join now! Up to 80 GB of storage required subject to change. Additional storage hardware, broadband ISP fees apply , Microsoft Account, and Xbox Live may be required for setup, some updates, and features, including retention of some gameplay settings and information xbox.

Features, online services, and system requirements vary by country and are subject to change or retirement over time.

Features may vary between Xbox One and Windows 10 versions of the game. Live Gold membership sold separately required for online multiplayer on Xbox One.

Subject to Microsoft Services Agreement at microsoft. Skin and online multiplayer require Xbox Live Gold on console, membership sold separately.

Games information at xbox. Skip to main content. Trailers and gameplay. Operation 4 Brothers in Arms is live This new, free update brings the largest one-time drop of characters since launch and completes the original Delta Squad with Dom Santiago.

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For this reason spur gears are used in low-speed applications and in situations where noise control is not a problem, and helical gears are used in high-speed applications, large power transmission, or where noise abatement is important.

A disadvantage of helical gears is a resultant thrust along the axis of the gear, which must be accommodated by appropriate thrust bearings.

However, this issue can be turned into an advantage when using a herringbone gear or double helical gear , which has no axial thrust - and also provides self-aligning of the gears.

This results in less axial thrust than a comparable spur gear. A second disadvantage of helical gears is also a greater degree of sliding friction between the meshing teeth, often addressed with additives in the lubricant.

For a "crossed" or "skew" configuration, the gears must have the same pressure angle and normal pitch; however, the helix angle and handedness can be different.

The relationship between the two shafts is actually defined by the helix angle s of the two shafts and the handedness, as defined: [22].

The crossed configuration is less mechanically sound because there is only a point contact between the gears, whereas in the parallel configuration there is a line contact.

Quite commonly, helical gears are used with the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a left-handed helix of equal angles.

The two equal but opposite angles add to zero: the angle between shafts is zero—that is, the shafts are parallel. Where the sum or the difference as described in the equations above is not zero, the shafts are crossed.

For shafts crossed at right angles, the helix angles are of the same hand because they must add to 90 degrees. This is the case with the gears in the illustration above: they mesh correctly in the crossed configuration: for the parallel configuration, one of the helix angles should be reversed.

The gears illustrated cannot mesh with the shafts parallel. Double helical gears overcome the problem of axial thrust presented by single helical gears by using a double set of teeth, slanted in opposite directions.

A double helical gear can be thought of as two mirrored helical gears mounted closely together on a common axle.

This arrangement cancels out the net axial thrust, since each half of the gear thrusts in the opposite direction, resulting in a net axial force of zero.

This arrangement can also remove the need for thrust bearings. However, double helical gears are more difficult to manufacture due to their more complicated shape.

Herringbone gears are a special type of helical gears. They do not have a groove in the middle like some other double helical gears do; the two mirrored helical gears are joined together so that their teeth form a V shape.

For both possible rotational directions, there exist two possible arrangements for the oppositely-oriented helical gears or gear faces. One arrangement is called stable, and the other unstable.

In a stable arrangement, the helical gear faces are oriented so that each axial force is directed toward the center of the gear. In an unstable arrangement, both axial forces are directed away from the center of the gear.

In either arrangement, the total or net axial force on each gear is zero when the gears are aligned correctly.

If the gears become misaligned in the axial direction, the unstable arrangement generates a net force that may lead to disassembly of the gear train, while the stable arrangement generates a net corrective force.

If the direction of rotation is reversed, the direction of the axial thrusts is also reversed, so a stable configuration becomes unstable, and conversely.

Stable double helical gears can be directly interchanged with spur gears without any need for different bearings. A bevel gear is shaped like a right circular cone with most of its tip cut off.

When two bevel gears mesh, their imaginary vertices must occupy the same point. Their shaft axes also intersect at this point, forming an arbitrary non-straight angle between the shafts.

The angle between the shafts can be anything except zero or degrees. Bevel gears with equal numbers of teeth and shaft axes at 90 degrees are called miter US or mitre UK gears.

Spiral bevel gears can be manufactured as Gleason types circular arc with non-constant tooth depth , Oerlikon and Curvex types circular arc with constant tooth depth , Klingelnberg Cyclo-Palloid Epicycloid with constant tooth depth or Klingelnberg Palloid.

Spiral bevel gears have the same advantages and disadvantages relative to their straight-cut cousins as helical gears do to spur gears. Note: The cylindrical gear tooth profile corresponds to an involute, but the bevel gear tooth profile to an octoid.

Hünecke, TU Dresden]. Furthermore, the "involute bevel gear sets" cause more noise. Hypoid gears resemble spiral bevel gears except the shaft axes do not intersect.

The pitch surfaces appear conical but, to compensate for the offset shaft, are in fact hyperboloids of revolution. Depending on which side the shaft is offset to, relative to the angling of the teeth, contact between hypoid gear teeth may be even smoother and more gradual than with spiral bevel gear teeth, but also have a sliding action along the meshing teeth as it rotates and therefore usually require some of the most viscous types of gear oil to avoid it being extruded from the mating tooth faces, the oil is normally designated HP for hypoid followed by a number denoting the viscosity.

Also, the pinion can be designed with fewer teeth than a spiral bevel pinion, with the result that gear ratios of and higher are feasible using a single set of hypoid gears.

Whereas a regular nonhypoid ring-and-pinion gear set is suitable for many applications, it is not ideal for vehicle drive trains because it generates more noise and vibration than a hypoid does.

Bringing hypoid gears to market for mass-production applications was an engineering improvement of the s. Crown gears or contrate gears are a particular form of bevel gear whose teeth project at right angles to the plane of the wheel; in their orientation the teeth resemble the points on a crown.

A crown gear can only mesh accurately with another bevel gear, although crown gears are sometimes seen meshing with spur gears.

A crown gear is also sometimes meshed with an escapement such as found in mechanical clocks. Worms resemble screws.

A worm is meshed with a worm wheel , which looks similar to a spur gear. Worm-and-gear sets are a simple and compact way to achieve a high torque, low speed gear ratio.

For example, helical gears are normally limited to gear ratios of less than while worm-and-gear sets vary from to A worm gear is a species of helical gear, but its helix angle is usually somewhat large close to 90 degrees and its body is usually fairly long in the axial direction.

These attributes give it screw like qualities. The distinction between a worm and a helical gear is that at least one tooth persists for a full rotation around the helix.

If this occurs, it is a 'worm'; if not, it is a 'helical gear'. A worm may have as few as one tooth. If that tooth persists for several turns around the helix, the worm appears, superficially, to have more than one tooth, but what one in fact sees is the same tooth reappearing at intervals along the length of the worm.

The usual screw nomenclature applies: a one-toothed worm is called single thread or single start ; a worm with more than one tooth is called multiple thread or multiple start.

The helix angle of a worm is not usually specified. Instead, the lead angle, which is equal to 90 degrees minus the helix angle, is given. In a worm-and-gear set, the worm can always drive the gear.

However, if the gear attempts to drive the worm, it may or may not succeed. Particularly if the lead angle is small, the gear's teeth may simply lock against the worm's teeth, because the force component circumferential to the worm is not sufficient to overcome friction.

In traditional music boxes, however, the gear drives the worm, which has a large helix angle. This mesh drives the speed-limiter vanes which are mounted on the worm shaft.

Worm-and-gear sets that do lock are called self locking , which can be used to advantage, as when it is desired to set the position of a mechanism by turning the worm and then have the mechanism hold that position.

An example is the machine head found on some types of stringed instruments. If the gear in a worm-and-gear set is an ordinary helical gear only a single point of contact is achieved.

This is done by making both concave and joining them at a saddle point ; this is called a cone-drive [30] or "Double enveloping".

Worm gears can be right or left-handed, following the long-established practice for screw threads. Non-circular gears are designed for special purposes.

While a regular gear is optimized to transmit torque to another engaged member with minimum noise and wear and maximum efficiency , a non-circular gear's main objective might be ratio variations, axle displacement oscillations and more.

Common applications include textile machines, potentiometers and continuously variable transmissions. A rack is a toothed bar or rod that can be thought of as a sector gear with an infinitely large radius of curvature.

Torque can be converted to linear force by meshing a rack with a pinion: the pinion turns; the rack moves in a straight line.

Such a mechanism is used in automobiles to convert the rotation of the steering wheel into the left-to-right motion of the tie rod s.

Racks also feature in the theory of gear geometry, where, for instance, the tooth shape of an interchangeable set of gears may be specified for the rack, infinite radius , and the tooth shapes for gears of particular actual radii are then derived from that.

The rack and pinion gear type is employed in a rack railway. In epicyclic gearing one or more of the gear axes moves.

Examples are sun and planet gearing see below , cycloidal drive , automatic transmissions , and mechanical differentials.

Sun and planet gearing is a method of converting reciprocating motion into rotary motion that was used in steam engines. James Watt used it on his early steam engines to get around the patent on the crank , but it also provided the advantage of increasing the flywheel speed so Watt could use a lighter flywheel.

In the illustration, the sun is yellow, the planet red, the reciprocating arm is blue, the flywheel is green and the driveshaft is gray.

A harmonic gear or strain wave gear is a specialized gearing mechanism often used in industrial motion control , robotics and aerospace for its advantages over traditional gearing systems, including lack of backlash, compactness and high gear ratios.

Though the diagram does not demonstrate the correct configuration, it is a "timing gear," conventionally with far more teeth than a traditional gear to ensure a higher degree of precision.

A cage gear , also called a lantern gear or lantern pinion , has cylindrical rods for teeth, parallel to the axle and arranged in a circle around it, much as the bars on a round bird cage or lantern.

The assembly is held together by disks at each end, into which the tooth rods and axle are set.

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