Jan 15, 2017 flat plate cam for more information and a worksheet go to. Wedge cams a wedge cam has a wedge of specified contour. The radii of curvature of the three cam profiles are shown in fig. Cam mechanisms are widely used because with them, different types of motion can be possible. As per its name in radial cam the follower movement is takes place radially in the center of the cam. The first step when design cam is to define the mathematical functions to be used to define the motion of the follower. They also have generated figures of cam profiles as enve. Norton, design of machinery introduction to cam design. In recent times the trend in cam design is towards producing better motion requirements for highspeed applications. The paper presents an original method to determine the efficiency of a mechanism with cam and follower. The follower is unusual because it has a roller wheel to help the smooth movement of the flat profile cam and follower. The flatplate worm gear combination was originally adapted for. Design and analysis of cam mechanisms with a flatfaced.
The dip towards zero at the cam nose for design e can be. A translating or a swing arm follower must be constrained to maintain contact with the cam profile. It is not necessary to enter into cam profile design procedures as these are time consuming and may be covered in other units. The translating, wedge, or flatplate cam is one that moves back and forth driving a follower. To this end, equations for a number of standard types of displacement curves that can be used to address most highspeed. The translation motion of the wedge is imparted to the follower which either reciprocates or oscillates. The follower moves in a plane perpendicular to the axis of rotation of the camshaft and is held in contact with the cam by springs or gravity.
The diagram below shows a basic example of a flat plate cam linear cam. The radial cam may be a simple recognisable shape, such a circle or ellipse, or. Previous studies have shown that the design wind loads on the photco. Comp cams general motors engine technical specs and information. Unified supply sources the highest quality flat plate airport conveyor carousel parts available. Cam profiles for flat bucket tappets are convex and relatively easy to grind with a free choice of grinding wheel diameter as the radius of curvature of the profile is always positive. This video explains how to draw cam profile when out stroke of the follower is with s.
As the flat plate cam profile moves to the left the follower drops down the slope and then eventually rises up at the other end. Allowing a follower to ride on this outer edge gives the follower a. Structural steel flat plate construction by janis vacca, p. To avoid edge contact always install new lifters and a new. A hybrid approach for cam shape design and profile machining of general plate cam mechanisms. Cams convert rotary oscillating or linear motion into a linear or reciprocating action to carry out useful work. However, the manufacturing of cams is expensive and the wear effect due to the. Least distance from the roller centre to the camshaft centre line, 50 mm. When one of these blocks is used, it is necessary to machine a small groove in the rear journal of the cam to allow oil flow to the top of the engine. The cam converts rotary motion of one element into reciprocating linear motion or into oscillatory motion. Made up of a flat plate or disc with an edge profile to transmit motion. Wedge or flat cam free download as powerpoint presentation. The edge of the flat plate cam can be shaped to give different vertical movements of the cam follower. Analysis and design of flat slab with and without shear.
In this case, reinforcement bars should be properly detailed between the columns and slabs. Parameter effects on design and performance of flat plate. A more sophisticated example of a flat plate linear cam is shown below. Spring is used to maintain the contact between the cam and the followers. In case of flat faced followers, the cam curvature is the. For a flat tappet cam, the radius of curvature is related to other cam parameters as follows. Cams can provide unusual and irregular motions that may be impossible with the other types of mechanisms. A typical flatplate collector is an insulated metal box with a glass or plastic cover called the glazing and a darkcolored absorber plate. Aci 318 requires moments and shears in twoway posttensioned slab systems to be determined either by the equivalent frame method efm or by more detailed design. The span l of a reinforced concrete flatplate is approximately d x 28 for simply supported, d x 30 for an end span of a continuous system, to d x 32 for internal continuous spans. Aci 318 requires moments and shears in twoway posttensioned slab systems to be determined either by the equivalent frame method efm or.
Scribd is the worlds largest social reading and publishing site. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Cam and follower design basics design of cam profiles. Chapter 6 construction method for flat plate system. It is normally connected with a prime mover, which rotates it. Then the condition that the whole segments of the cam profile are convex, and the coordinates of the cam profile are.
Generally, a spring is used to maintain contact between the follower and the cam here the cam has translatory motion and the profile of the cam is formed on one side of the cam. Prime circle radius base circle radius for knife edge and flat faced follower. Jul 28, 2014 an economical span for a reinforced flat plate is of the order of 6 to 8 m and for prestressed flat plates is in the range of 8 to 12 m. Here are the highlights and key features of bendtech sm. Flatplate collectors flatplate collectors are the most common solar collector for solar waterheating systems in homes and solar space heating. Flat design became popular in mobile ui and icon design 18 and despite of the fact that study results shows a higher cognitive load for searching flat icons 19, we stick to flat design in the.
The worm is turned by a 10 pulley attached by a drive belt to an electric motor of varying horse power. Pdf a hybrid approach for cam shape design and profile. A fully animated cam profile construction for easy understanding. Rise 48 mm with uniform velocity 0 to 1 second dwell 1 to 1. Spencer, in knitting technology third edition, 2001. Construction of displacement diagrams and calculation of velocities and accelerations of. An economical span for a reinforced flat plate is of the order of 6 to 8 m and for prestressed flat plates is in the range of 8 to 12 m.
A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion. The most commonly used cam is the cam plate also known as disc cam or radial cam which is cut out of a piece of flat metal or plate. Wedge or flat cam machines applied and interdisciplinary. Flat plate cam for more information and a worksheet go to. The cam is the driver member and the follower is the driven member. We aim to keep emergency parts in stock and available. To study the effectiveness of all these models, the plate center stresses, plate corner stresses, flat plate principal. The thickness of flat plates is often governed by punching shear.
Computeraided manufacturing cam and design cad software for printed circuit board pcb prototyping, supporting gerber, excellon drill files, gcode and visualization. Cam and follower design basics design of cam profiles and. This is the only sheet metal and plate design software available on the market for the hobbyist, school, prototype shop, maintenance facility, or performance shop. Comp cams general motors engine technical specs and. By employing the concepts of support line and support function of the integral geometry, this paper presents an method for analyzing cam mechanisms with a flatfaced follower, including a translating follower, oscillating follower and planar motion follower. The biggest cause of edge contact on cam lobes is installing worn lifters with a new camshaft. Department af energy and torrns part of the solar pho. The flat plate cam then reverses in the opposite direction and the follower drops and rises again. Coverage of cam types, followers and input and output motions should be qualitative. In present study, flat slab system of 10,20and30 stories without shear wall and the flat slab system with shear wall of 10,20and30 stories having varying thicknesses of shear wall are compared. Radial cams are one of the most common types of cam. Even if the lifters look ok, the spherical shape may be worn flat. Be sure to check the diameter and depth of the hole in the front, as well as the length of the dowel pin.
Plate or disk cams are the simplest and most common type of cam. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. On mechanicallycontrolled flats, it is necessary to join the front and back needle bed cam plates with a bow or bridge in order to drive the cam carriage as a single unit. The manual cam layout method described in this section is used primarily for. Fundamentals of post tensioned design for buildings. The radial cam is a rotating plate or disc with an outer circumference shaped to produce a required movement usually linear to a follower which is held against it.
The nearest approach of the follower to the cam center is 35 mm. Pdf the optimum design of a cam mechanism is a time consuming task, due to the numerous alternatives. The radial distance from the center of the disk is varied throughout the circumference of the cam. Several key terms are relevant in such a construction of plate cams. Cam mechanisms are widely used because with them, different types of motion. By employing the concepts of support line and support function of the integral geometry, this paper presents an method for analyzing cam mechanisms with a flat faced follower, including a translating follower, oscillating follower and planar motion follower. The same holds true for the first 1965 and 1966 396427 big blocks. G 2x2 gray plate h 2x2 green plate i 2x2 blue plate j 2x2 rotating plate k 2x4 yellow plate wo holes l 2x4 gray plate with holes m 3x6 green triangular plate n 2x2 blue round plate o 2x2 white round plate p 1x10 gray plate q 1x8 gray plate r 1x6 gray plate s 1x4 gray plate t 1x3 yellow plate u gray corner plate v 1x2 gray plate. The calculation of the coordinates of the point p has two steps. Kinematic diagram of a cam mechanism terminated by a plate 14. Sample cam design problem a radial plate cam rotates at 20 revolutions per minute and operates an inline knifeedge follower. Draw the profile on the cam that will impart the following motion to the follower. Analysis and design of flat slab with and without shear wall.
Constant velocity figure 23 the s v a j diagrams of a bad cam design pure constant velocity h 0 s v 0 0 90 180 270 360 a 0 j 0. The follower moves in a plane perpendicular to the axis of rotation of the camshaft. The emphasis should be on the identification of the different types and their typical applications. The disk or plate cam has an irregular contour to impart a specific motion to the follower. Diy flat plate solar collector design using a new concept. Draw a simple design and add notes to explain your idea. Flatplate boat hoist the flatplate boat hoist is a 96 tooth worm gear turned by a worm mounted on a flatplate of steel or other material such as aluminum. How to draw cam profile complete construction part 3. With the rotation of the cam, the follower the shaft with the roller at bottom in the above picture gets oscillated or translated according to. Pdf optimal design of a cam mechanism with translating flat. The translating, wedge, or flatplate cam is one that moves back and forth driving. If so, the lifters with a new camshaft will result in will result in improper contact and early lifter and cam lobe failure. Sometimes flat plate is also used at the place of wedge with grove in which follower is held and rotates, in this grove a roller follower is used.
The nose of the hydraulic roller 08 is necked down to accommodate the cam retention plate. How cam and follower mechanisms work bright hub engineering. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Cams and cam followers teacher linkedin slideshare. Introduction of cams and types of cam and followers. Mechanical cam types and operation cams convert ordinary shaft rotation into a more complicated pattern of motion. Mar 20, 2017 this video explains how to draw cam profile when out stroke of the follower is with s. Pdf plate cam mechanism can easily produce the positive and functional motions. The cam and follower mechanism is widely used for operating the inlet and exhaust valves of internal combustion engines.
The 07 is an lt1lt4 shaft which has a longer dowel pin and a center hole for the distributor. In the concrete column with flat plate design, the connection is more simplified without the need for base plate connection. This is a plate cam with the follower riding in a groove in the face of the cam. Here, the follower moves in a plane perpendicular to the axis of rotation of the camshaft. One basic rule in cam design is that this motion curve must be continuous and the first and second derivatives corresponding to the velocity and acceleration of the follower must be finite even at the. Flat plate collectors flat plate collectors are the most common solar collector for solar waterheating systems in homes and solar space heating.
359 701 409 1400 1097 150 1356 66 1089 1260 915 799 561 690 172 103 968 672 817 84 1250 417 490 862 136 413 1510 676 326 694 642 1217 793 466 990 888 578 633 1020 975 1191 1021 349 652