mathematical operators and mechanical variables
Friends, Overloaded Operators, and Arrays in Classes
... 46 Overloading Unary Operators Unary operators take a single argument The unary – operator is used to negate a value x = -y ++ and - - are also unary operators Unary operators can be overloaded ... > The insertion operator
Ngày tải lên: 12/09/2012, 22:53
Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... APPLICATIONS Viscous liquid adhesives are used to glue fabrics and paper, apply paper labels, make cardboard and wooden boxes and shoes, and bind books Specially designed machines are required if ... would bend and jam Avoid these designs, if possible—Especially if automatic assembly methods will be employed A rotary screw-feed handles screws, headed pings, shouldered shafts, and similar ... Cutoff and transfer devices for glass tubes The upper part of a rotating glass tube is held by a chuck (not shown) When the cutter cuts the tube to a given length, the mandrel comes down and a...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... 4, and T3/T4 = L3/L4 = 2/3, where T3 and T4 are the numbers of teeth on gears and T1 and T2 will denote the numbers of teeth on gears and 98 and S = ∆θ 3/θ30 Hence θ30(1 + S)L3 = 360º For S = and ... = r4 and r2 = r3, there is no “differential motion” and the output remains stationary Thus if one gear pair, say and 4, is made partly circular and partly noncircular, then where r2 = r3 and r1 ... pulleys, and linkages (see drawing) instead of the usual genevas or cams is capable of cyclic start -and- stop motions with smooth acceleration and deceleration Developed by Eric S Buhayar and Eugene...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... Dynamic and static balancing is simplified when an expanding wheel is attached to a nonexpanding main wheel As a pulley, an expanding wheel can have a steel band fastened to only one section and ... 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 grilles are often ... steel band, or rope around the drum is fastened to the driving and driven members; sprocket-wheels and chain can replace the drum and belt GEARS Fig Matching gear-segments Fig 10 Racks and coupled...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... Bearing adjustment This screw arrangement is a handy way for providing bearing adjustment and overload protection Rapid and slow feed With left- and right-hand threads, slide motion with the nut locked ... boasts high mechanical stability for use in precision instruments and that there be a zero gap between sector and saddle nut Pivots with a Twist A pair of opposed, taut, flexible bands in combination ... 0.4—A linear spring rate and high load resistance with small deflections For height to spring ratios between 0.8 and 1.0—An almost linear spring rate for fasteners and bearing and in stacks For rations...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... increasing mechanical advantage to counteract the resistance of the material being compressed A rotating handwheel with a differential screw moves nuts A and B together, and links I and II are ... equations of motion Fig A standard differential winch consists of two drums, D1 and D , and a cable or chain which is anchored on both ends and wound clockwise around one drum and counterclockwise around ... ROLLER CHAINS AND THEIR ADAPTATIONS Various roller, side-plate and pin configurations for power transmissions, conveying, and elevating STANDARD ROLLER CHAIN—FOR POWER TRANSMISSION AND CONVEYING...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... power losses in the gears and bearings and from windage and churning of lubricant gear power: A gear’s load and speed capacity, determined by gear dimensions and type Helical and helical-type gears ... motor comparable in size and power to those used in standard reel-to-reel recorders, and a large bi-peripheral flywheel and sturdy capstan that reduces wow and flutter and drives the tape A patent ... drive: stator, nutator, and rotor Correctly designed cams on the stator and rotor assure a low-noise engagement and mathematically pure rolling contact between camrollers and cams The drive’s characteristics...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... bi-directional slip and independent torque capacities for the two directions of rotation It requires two springs, one right-handed and one left-handed, for coupling the input, intermediate and output ... faster Edges of the clutch bands carry the entire load, and there is also a compound action of one band upon another As the torque builds up, each band pushes down on the band beneath it, so each ... requirements of MIL-E-5400, class and MILK-3926 specifications Applications were seen in counter and reset switches and controls for machines and machine tools, radar systems, and precision potentiometers...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... on winding reels and similar drives, or for driving independent parts of a machine in synchronism MECHANICAL DRIVES A band brake is used on coil winders, insulation winders, and similar machines ... between the pin and the rotating finger must be shorter than the thread pitch so the pin can clear the finger on the first reverse-turn The rubber ring and grommet lessen the impact and provide a ... FIG 2—SECONDARY INDICATORS FIG 3—CONTROLLERS AND ACTUATORS 348 lines, textile processing equipment, paper machines, rubber and plastic processers, and printing presses In each of these examples,...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... completely encased and cannot expand beyond its original diameter The standard pump is made of bronze and will handle volumes to 15 gpm The Squeegee develops a vacuum of 25 in of mercury and will work ... sucking and pushing actions and are not churned or foamed 370 PUMPING ACTION is produced by the meshing of the idler and rotor teeth in this rotary pump The idler is pinmounted to the head and the ... single-gland type Automatic wear control compensates for normal wear and maintains volumetric efficiency This pump will handle to 300 gph without churning or foaming It needs no lubrication and operates...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 13
... opposite sense to ψ14, ψ13 and ψ12 This establishes points A′2, A′3 and A′4, but here A′3 and A′4 coincide because of symmetry of A3 and A4 about A0B0 Draw lines A1A′2 and A1A′4, and the perpendicular ... a link and spring The mechanical view is shown at left, and the kinematic representation is at right Fig Typical applications of toggles: (A) snap-action switches; (B) ribbon reversing mechanical ... in their motion, giving a high mechanical advantage Toggles of this kind offer: (1) a high mechanical advantage, (2) a high velocity ratio, and (3) a variable mechanical advantage 453 Sclater...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 14
... elements and icons, and 2D drafting and detailing capability, which support design collaboration and compatibility among CAD, CAM, and computer-aided engineering (CAE) applications Designers and engineers ... interconnect plane and three mechanical layers can be micromachined, and SUMMiT V Technology, a similar five-level process except that four mechanical layers can be micromachined Sandia offers this ... datums, and section lines • Automated geometric dimensioning and tolerancing (GD&T) • Symbol creation, including those for weld and surface finish, with real-time edit or move capability and leaders...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 15
... revised and edited the Second 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 ... in the military/aerospace industry and a Boston engineering consulting firm before changing his career path to writing and editing on electronics and electromechanical subjects He was a staff ... Sourcebook, and was the author/editor of the First Edition He was a mechanical engineer and consultant in industry before joining the staff of Product Engineering magazine as its mechanical design...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 12
... left-handed threads, • An eye on a shank with external righthanded threads, and • A flanged collar with left-handed external threads to mate with the shank of the firstmentioned eye, and right-handed ... connectors In step 5, the handle is pushed upward an additional 15º, locking the handle cam and the slide In step 6, the handle is rotated an additional 30º, forcing the box and the mating spring-loaded ... the handle and retention cams as the box is moved rearward and downward 409 Sclater Chapter 12 5/3/01 1:24 PM Page 410 Perpendicular-Force Latch (continued ) dle has been installed on the handle...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 16
... angular-momentum-balanced, robot ball -and- cone ball -and- disk, and ball -and- screw bearings and roller belt belt -and- chain, variable speed cam for machine tools for tool-slide mechanism two-directional rack -and- gear Links ... adjustable ball, and belt general Graham electrically-coupled planetary ring, and roller, and two curve-slider differential fixed general robot disk adjustable and roller ball, and general planetary ... toggle -and- cord triple -shaft Twinworm, gear typewriter unidirectional universal, joint valve variable-speed, mechanical belt -and- chain friction general and transmissions variable-stroke wheel and...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 17
... machine design instructors at the college and vocational school level, amateur and professional inventors, and students of all of the engineering disciplines and physical sciences Last but not least, ... pump, steam engine, and chronometer, to the cotton gin, and airplane were invented by self-trained engineers, scientists, and technicians By themselves, many of the mechanisms and devices described ... anonymous artisans, millwrights, instrument makers, and mechanics over the past centuries They left behind the sketches, formal drawings, and even the working models on which many of the illustrations...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 18
... Electromagnetic Clutches and Brakes Trip Roller Clutch Geared Electromechanical Rotary Joint Ten Universal Shaft Couplings Methods for Coupling Rotating Shafts Linkages for Band Clutches and Brakes Special ... to Limit Shaft Rotation Mechanical Systems for Controlling Tension and Speed Drives for Controlling Tension Switch Prevents Overloading of a Hoist Mechanical, Geared, and Cammed Limit Switches ... Pneumatic, Hydraulic, and Electric Governors Speed Control Devices for Mechanisms Floating-Pinion Torque Splitter CHAPTER 11 PNEUMATIC AND HYDRAULIC MACHINE AND MECHANISM CONTROL Designs and Operating...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 1
... place and remove parts from annealing furnaces and punch presses, and they assemble and test electrical and mechanical products Benchtop robots pick and place electronic components on circuit boards ... floor-standing, 6-axis, heavy-duty robots with reaches of between and 10 ft, (2.5 and 3.0 m) and maximum payloads of 441 to 880 lb (200 to 400 kg) S-900i robots can perform such tasks as materials handling ... precision gear drives All process and application cables are routed through the arm, and there are brakes on all axes S-900i robots support standard I/O networks and have standard Ethernet ports Process-specific...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 2
... positioning antenna reflectors, opening and closing security gates, handling materials, and raising and lowering scissors-type lift tables, machine hoods, and light-duty jib crane arms Other linear ... trajectory, and it can be constant except during starting and stopping Computer-Aided Emulation Several important types of programmed computer-aided motion control can emulate mechanical motion and eliminate ... capabilities, the number of input/output (I/O) ports required, and the need for such features as linear and circular interpolation and electronic gearing and camming In general, a motion controller receives...
Ngày tải lên: 22/10/2012, 14:27
Báo cáo y học: "A review of anatomical and mechanical factors affecting vertebral body integrit
... pathophysiology of osteoporosis and the local and global environment in which the bone operates The local environment includes muscle and connective tissue attachments and the adjacent intervertebral ... lowest BMD, lowest trabecular number and greatest trabecular separation Generally vertebrae are less dense anteriorly and superiorly and more dense posteriorly and inferiorly with heterogeneity ... trunk may lead to a biomechanical overload of already weakened vertebrae and perpetuate subregional microtrauma due to suboptimal movement control and muscle recruitment Hodges and Richardson [36]...
Ngày tải lên: 03/11/2012, 09:49