machines mechanical devices and apparatus
Robot Mechanisms and Mechanical Devices Illustrateds on bone fracture repair - identifying important cellular characteristics ppt
... usually described by global mechanical factors, such as gap size and interfragmentary movement The relationship between global mechanical factors and the local stresses and strains that influence ... developed and used together with in vivo and in vitro experiments to quantitatively determine the rules that govern the effects of mechanical loading on cells and tissue differentiation, growth, and ... mechanical stimulation, using stress and strain invariants, determines the cell and tissue differentiation pathways The cells act as sensors, and they respond depending on their environment Mechanical
Ngày tải lên: 09/03/2014, 00:20
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated Part 3 pptx
... the number of input/output (I/O) ports required, and the need for such fea-tures as linear and circular interpolation and electronic gearing and cam-ming In general, a motion controller receives ... continues to narrow) and their installation adds to overall motion control system cost and complexity Table 1-1 summarizes some of the outstanding characteristics of stepper, PM brush, and PM brushless ... cir-cuitry and microprocessors have increased the reliability and cost-effectiveness of digital motion controllers and motor drivers oramplifiers while permitting them to be packaged in smaller and
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated Part 4 doc
... positioning antenna reflectors, opening and closing security gates, handling materials, and raising and lowering scis- sors-type lift tables, machine hoods, and light-duty jib crane arms. Other ... resolvers, and linear variable differential transformers (LVDTs) for motion and position feed- back, and tachometers for velocity feedback. Less common but also in use as feedback devices are ... coil and spring determines its function... drives it In a typical servosystem application, it is mechanically coupled to the DC motor and feeds its output voltage back to the controller and
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 5 doc
... Chapter 1 Motor and Motion Control Systemsfound in counters, circuit breakers, electronic component pick-and-placemachines, ATM machines, machine tools, ticket-dispensing machines,and photocopiers ... 1 Motor and Motion Control Systemsnoids are specified for higher-end applications such as tape decks, trial controls, tape recorders, and business machines because they offermechanical and electrical ... directly to the motor and essen-tially make it a bigger and heavier but more effective motor Others require separate shafts and mounts between the motor and the output shaft; and still others directly
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 6 ppsx
... smoother and quieter action than spur gears When their axes are parallel, they are called parallel helical gears, and when they are at right angles they are called helical gears Herringbone and worm ... based on helical gear geometry Herringbone gears are double helical gears with both right-hand and left-hand helix angles side by side across the face of the gear This geom-etry neutralizes axial ... where there are right angles between input and output shafts This class of gears includes the most common straight and spiral bevel as well as the miter and hypoid Straight bevel gears are the simplest
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 7 pot
... This mechanical device is called a torque limiter There are many ways to limit torque Magnets, rubber bands, friction clutches, ball detents, and springs can all be used in one way or another, and ... Trang 14Suspensions and DrivetrainsCopyright © 2003 by The McGraw-Hill Companies, Inc Click here for Terms of Use. Trang 16ing the suspension and drivetrain, and/or legs and feet The ability ... handle the torque With careful control of motor power, both accelerating and braking, even torque limiters can be left out of most designs Torque limiters should be considered as protective devices
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 9 ppt
... tracks and a separate method for steering • Two track fore-and-aft • Several designs that use four tracks Trang 2• A six-tracked layout consisting of two main tracks and two sets offlipper tracks and ... idler/tensionwheel, suspension system, and, sometimes, support rollers There areseveral variations of the track system, each with its own set of bothmobility and robustness pros and cons • The design of the ... construction equipment and military tanks like the M1A2 Abrams The M1A2’s tracks are 635 meters wide (the width of a comfortable chair) and 4.75 meters long (longer than most cars) and together, including
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 10 ppt
... can reach and the robot will not fall over The wide feet must also prevent tipping over sideways and are so wide that they overlap each other and must be carefully shaped and controlled ... there Figures 7-8 and 7-9 show four- and six-legged walkers with three rotary-actuated joints... eight-leg layout would have no less than 24 actuators The four- and six-legged versions ... other side. This steering method is so effective and robust that it is used on a large percentage of four-, six-, and even eight-wheeled robots, and nearly all modern tracked vehicles whether autonomous
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 11 ppsx
... fore/aft, turn, and up/down, and. .. fore/aft, turn, and up/down, and each requires a certain amount of power The three axes of a standard coordinate system are labeled X, Y, and Z, but for ... effectors are not complex mechanically 219 220 Chapter 8 Pipe Crawlers and Other Special Cases and this chapter will focus on the mobility systems required for unusual environments and unusual methods ... pipe walls and are a simple and effective traction technique. Chapter 8 Pipe Crawlers and Other Special Cases 223 Wheeled Vertical Pipe Crawlers Wheeled pipe crawlers, like their land-based cousins,
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 12 doc
... canpitch up and down, and extend in and out(Figure 10-8) Raising the shoulder up (Figure10-9) changes the envelope somewhat and isworth considering in some cases Figures 10-10,10-11, and 10-12 ... envelope and orient the gripper in any orientation is six; threefor location, and three for orientation In other words, there must be atleast three bending or extending motions to get position, and ... joints of the manipulator can be in any order,and the arm and wrist segments can be any length, but there are only afew combinations of joint order and segment length that work effec-tively They
Ngày tải lên: 10/08/2014, 04:22
McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 13 potx
... Chapter 11 Proprioceptive and Environmental Sensing Mechanisms and DevicesINDUSTRIAL LIMIT SWITCHES Actuators Linear Mechanical Switches Figure 11-5a Mechanical, Geared, and Cam Limit Switches Trang ... Trang 10Chapter 11 Proprioceptive and Environmental Sensing Mechanisms and Devices 273Trang 13276 Chapter 11 Proprioceptive and Environmental Sensing Mechanisms and DevicesLAYOUTS With the possible ... Rotary-Cam Limit Switches Figure 11-5b Mechanical, Geared, and Cam Limit Switches Trang 9272 Chapter 11 Proprioceptive and Environmental Sensing Mechanisms and DevicesFigure 11-6 Limit Switches in
Ngày tải lên: 10/08/2014, 04:22
Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... Page 76 HIGH-SPEED MACHINES FOR ADHESIVE 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 ... MECHANISMS FOR WINDING MACHINES The seven mechanisms shown are parts of different yarn- and coil-winding machines Their fundamentals, however, might be applicable to other machines that require ... 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
... 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 ... 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 ... 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 ... in such machines as printing presses, planers, shears, winding machines, and automatic-feed machines • Where precise, nonlinear functions must be generated, as in mechanical computing machines...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... 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 ... 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 ... 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...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... 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 where ... 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, ... nuts, clutch plates, gear fingers, and pinned members form the basis of these ingenious mechanisms Mechanical stops are often required in automatic machinery and servomechanisms to limit shaft...
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