medium risk merged devices 453
Manage MD devices aka Linux Software Raid
Ngày tải lên :
18/09/2012, 10:13
... -n, raid -devices= Specify the number of active devices in the array This, plus the number of spare devices (see below) must equal the number of component -devices (including "missing" devices) ... spare devices For Manage mode: -a, add hotadd listed devices -r, remove remove listed devices They must not be active i.e they should be failed or spare devices -f, fail mark listed devices ... necessary support -x, spare -devices= Specify the number of spare (eXtra) devices in the initial array Spares can also be added and removed later The number of component devices listed on the command...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 3
Ngày tải lên :
22/10/2012, 14:26
... workpieces SORTING DEVICES In the simple device (A) the balls run down two inclined and slightly divergent rails The smallest balls, therefore, will fall into the left chamber, the medium- size ones ... it avoids the cam-based mechanisms more commonly used for accomplishing this job SIMPLE FEEDING DEVICES The oscillating sector picks up the desired number of parts, left diagram, and feeds them ... Sclater Chapter 5/3/01 10:19 AM Page 52 MECHANISMS THAT SORT, FEED, OR WEIGH ORIENTING DEVICES Here’s a common problem; Parts arrive in either open-end or closed-end first; you need a...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 4
Ngày tải lên :
22/10/2012, 14:26
... it is stationary 121 Sclater Chapter 5/3/01 10:45 AM Page 122 FRICTION DEVICES FOR INTERMITTENT ROTARY MOTION Friction devices are free from such common disadvantages inherent in conventional ... twostop operations, and they have difficulty producing three stops per index Most two-stop indexing devices available are cam-operated, which means they require greater input angles for indexing Geared ... wheel is driven approximately 60º, and then it stops for the remaining 300º ROTARY-TO-RECIPROCATING DEVICES In a typical scotch yoke, a, the motion of the rotating input crank is translated into the...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 5
Ngày tải lên :
22/10/2012, 14:26
... Sclater Chapter 5/3/01 11:45 AM Page 134 TWELVE EXPANDING AND CONTRACTING DEVICES Parallel bars, telescoping slides, and other devices that can spark answers to many design problems Figs and Expanding ... patent has been granted, and the linkage was applied to a camera to replace slides and telescoping devices Linkages, with their minimal pivot friction, serve many useful purposes in machinery, replacing ... plates) Other prior mechanisms relied on spring loading, differential multiple-point drives and other devices to reduce backlash In providing three-point drive along a track between the movable and...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 6
Ngày tải lên :
22/10/2012, 14:26
... Air is an ideal load-carrying medium It is highly elastic, its spring rate can be easily varied, and it is not subject to permanent set Air springs are elastic devices that employ compressed ... equals LA + LB 195 Sclater Chapter 5/3/01 12:25 PM Page 196 FOURTEEN ADJUSTING DEVICES Here is a selection of some basic devices that provide and hold mechanical adjustment Fig A spring-loaded pin ... variations about a preFig determined level Sclater Chapter 5/3/01 12:25 PM Page 191 TWENTY SCREW DEVICES A threaded shaft and a nut plus some way to make one of these members rotate without translating...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 7
Ngày tải lên :
22/10/2012, 14:26
... properly seated 216 Sclater Chapter 5/3/01 12:33 PM Page 217 EIGHT SNAP-ACTION DEVICES Another selection of basic devices for obtaining sudden motion after a gradual buildup of force Fig A torsion ... III come into toggle Sclater Chapter 5/3/01 12:33 PM Page 213 SIXTEEN LATCH, TOGGLE, AND TRIGGER DEVICES Diagrams of basic latching and quick-release mechanisms Fig Cam-guided latch (A) has one ... increasing load until friction is suddenly overcome This is a useful action for small sensitive devices where large forces and movements are undesirable This is the way we snap our fingers That...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 8
Ngày tải lên :
22/10/2012, 14:26
... quiet as spiral bevel gears because the straight teeth engage with full-line contact They permit medium load capacity Spiral bevel gears have curved oblique teeth The spiral angle of curvature ... logarithmic spiral gears shown in (A), are open-curved They are usually components in computing devices The elliptically shaped gears, shown in (B), are closed curved They are components in automatic...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 9
Ngày tải lên :
22/10/2012, 14:26
... in the tape drive shown Fig Two dual-spring clutches are in this tape drive Spring clutches are devices for driving a load in one direction and uncoupling it when the output is overdriven or the ... forward speed Sclater Chapter 5/3/01 12:57 PM Page 311 SEVEN OVERRUNNING CLUTCHES These are simple devices that can be made inexpensively in the workshop Fig A lawnmower clutch Fig Molded sprags ... (20º in this case) into a one-way motion to advance an inking ribbon One of the simplest known devices was used to obtain the one-way drive—a spring clutch which is a helical spring joining two...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 10
Ngày tải lên :
22/10/2012, 14:26
... small steam turbines 365 Sclater Chapter 10 5/3/01 1:08 PM Page 366 SPEED CONTROL DEVICES FOR MECHANISMS Friction devices, actuated by centrifugal force, automatically keep speed constant regardless ... control follows the summation of the errors in the material and the indicator itself The controlling devices, which are operated by the indicators, determine the degree of speed change required to ... from 16 in core diameter to 48 in maximum diameter The power to wind the coil is the controlling medium because, by maintaining constant winding power as the coil builds up, a constant value of...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 11
Ngày tải lên :
22/10/2012, 14:26
... indicator Capsules give improved linearity over bellows for such applications as pressure-measuring devices The force exerted by any capsule is equal to the total effective area of the diaphragms ... process pressure 381 Sclater Chapter 11 5/3/01 1:16 PM Page 382 DIFFERENTIAL TRANSFORMER SENSING DEVICES Gage pressure bellows transmitter The bellows is connected to a cantilever beam with a needle ... Sclater Chapter 11 5/3/01 1:16 PM Page 387 PERMANENT MAGNET MECHANISMS Fig A suspension Fig Tension devices Fig An instrument coupling Fig A reel brake Fig A crankcase oil drain plug Fig A non-rattling...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 13
Ngày tải lên :
22/10/2012, 14:26
... in selected position); (2) overload devices in mechanical linkages (they shift to the opposite position when sufficiently loaded); and (3) energy-storage devices Two applications, shown in Fig ... 5/3/01 1:32 PM Page 437 Fig A four-slot geneva (A) and an eight-slot geneva (B) Both have locking devices Consider an external geneva wheel, shown in Fig 1, in which n = number of slots a = crank ... Eq (19) into Eq (21), A sin θ = S sin (θ /2) = W/2 (22) Sclater Chapter 13 5/3/01 1:33 PM Page 453 Symbols A = length of toggle arm S = free length of toggle spring in detented positions θ =...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 14
Ngày tải lên :
22/10/2012, 14:26
... microminiature motors, sensors, gear trains, valves, and other devices that easily fit on a silicon microchip, but difficulties in powering these devices has inhibited their practical applications MEMS ... commercial demand Initially ADI built these devices by interleaving, combining, and customizing its internal manufacturing processes to produce the micromechanical devices with the same processes it used ... forms of microactuator Figure is a cutaway view of a typical microvalve The diaphragms of these devices flex in a direction that is perpendicular to their base substrates The diaphragms can be...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 15
Ngày tải lên :
22/10/2012, 14:26
... Data Sclater, Neil Mechanisms and mechanical devices sourcebook / Neil Sclater, Nicholas P Chironis.— 3rd ed p cm Rev ed of: Mechanisms & mechanical devices sourcebook / [edited by] Nicholas P ... Edition of Mechanisms and Mechanical Devices Sourcebook after the death of Mr Chironis The late Nicholas P Chironis developed the concept for Mechanisms and Mechanical Devices Sourcebook, and was the ... 1996 ISBN 0-07-136169-3 Mechanical movements I Chironis, Nicholas P II Mechanisms & mechanical devices sourcebook III Title TJ181.S28 2001 621.8—dc21 2001030297 Copyright © 2001, 1996, 1991 by...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 12
Ngày tải lên :
22/10/2012, 14:26
... loosening the screw 413 Sclater Chapter 12 5/3/01 1:25 PM Page 414 FRICTION CLAMPING DEVICES Many different devices for gaining mechanical advantage have been used in the design of friction clamps ... quickly released on demand is required Some suggested applications for this mechanism are in coupling devices for load-carrying carts or trucks, hooks or pick-up attachments for cranes, and quick-release ... 1:25 PM Page 416 DETENTS FOR STOPPING MECHANICAL MOVEMENTS Some of the more robust and practical devices for stopping mechanical movements are illustrated here Fixed holding power is constant in...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 16
Ngày tải lên :
22/10/2012, 14:27
... Detectors, jam Detents axial magnetic Detents cont positive radial stopping movement for roller Devices adjustable pitch speed spacecrank adjusting anti-backlash cartridge-actuated clamping clamping ... 53 402 234 92 114 114 191 202 191 192 53 217 54 366 383 417 416 414 422 123 114 387 Index Terms Devices cont tilting time-delay switching toggle translation-to-rotation variable-speed weight-regulating ... two-degree-of-freedom Rollers Rollers, ring latch Scotch yoke Screws arrangements, special ball bearing devices differential double-threading/threaded mechanisms, applications motion translation/transformation...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 17
Ngày tải lên :
22/10/2012, 14:27
... by self-trained engineers, scientists, and technicians By themselves, many of the mechanisms and devices described in this book are just mechanical curiosities, but when integrated by creative...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 18
Ngày tải lên :
22/10/2012, 14:27
... Spring-Type Linkage for Vibration Control Twenty Screw Devices Ten Ways to Employ Screw Mechanisms Seven Special Screw Arrangements Fourteen Adjusting Devices Linear Roller Bearings Are Suited for High-Load, ... Applications in Different Mechanisms Sixteen Latch, Toggle, and Trigger Devices Six Snap-Action Mechanisms Eight Snap-Action Devices Applications of the Differential Winch to Control Systems Six ... and Fixtures Friction Clamping Devices Detents for Stopping Mechanical Movements Ten Different Splined Connections Fourteen Ways to Fasten Hubs to Shafts Clamping Devices for Accurately Aligning...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 1
Ngày tải lên :
22/10/2012, 14:27
... reprogrammable, multifunction manipulator designed to move material, parts, tools, or specialized devices through variable programmed motions to perform a variety of tasks Robots can be floor-standing, ... can control the movements of the robot arm or manipulator with pushbuttons or other data input devices so that it is run manually through its complete task Fig Components of a floor-standing, ... driver The drivers are mounted directly on the baseplate, without any intervening power-transmission devices, like gears or belts, that could reduce stiffness and precision The position and orientation...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 2
Ngày tải lên :
22/10/2012, 14:27
... reach velocities of 9.8 ft/s (3 m/s) As shown in Fig 7, these stages can be equipped with feedback devices such Fig 14 This single-axis linear guide for load positioning is supported by air bearings ... have PM rotors and wound stator coils Commutation is performed by internal noncontact Hall-effect devices (HEDs) positioned within the stator windings The HEDs are wired to power transistor switching ... bar commutator of the brushless DC motor is replaced by electronic sensors, typically Hall-effect devices (HEDs) They are located within the stator windings and wired to solid-state transistor switching...
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