Chapter 6 construction method for flat plate system. The translation motion of the wedge is imparted to the follower which either reciprocates or oscillates. The worm is turned by a 10 pulley attached by a drive belt to an electric motor of varying horse power. 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 thickness of flat plates is often governed by punching shear. Jan 15, 2017 flat plate cam for more information and a worksheet go to.
To avoid edge contact always install new lifters and a new. The first step when design cam is to define the mathematical functions to be used to define the motion of the follower. In this case, reinforcement bars should be properly detailed between the columns and slabs. The biggest cause of edge contact on cam lobes is installing worn lifters with a new camshaft.
Comp cams general motors engine technical specs and information. Cams convert rotary oscillating or linear motion into a linear or reciprocating action to carry out useful work. Pdf the optimum design of a cam mechanism is a time consuming task, due to the numerous alternatives. 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. 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. Parameter effects on design and performance of flat plate. A fully animated cam profile construction for easy understanding. How cam and follower mechanisms work bright hub engineering. A hybrid approach for cam shape design and profile machining of general plate cam mechanisms.
The translating, wedge, or flatplate cam is one that moves back and forth driving a follower. Sample cam design problem a radial plate cam rotates at 20 revolutions per minute and operates an inline knifeedge follower. 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. This is a plate cam with the follower riding in a groove in the face of the cam. As per its name in radial cam the follower movement is takes place radially in the center of the cam. 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 follower is unusual because it has a roller wheel to help the smooth movement of the flat profile cam and follower. 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. How to draw cam profile complete construction part 3. Mar 20, 2017 this video explains how to draw cam profile when out stroke of the follower is with s. 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. In recent times the trend in cam design is towards producing better motion requirements for highspeed applications. Spencer, in knitting technology third edition, 2001.
Rise 48 mm with uniform velocity 0 to 1 second dwell 1 to 1. The translating, wedge, or flatplate cam is one that moves back and forth driving. To study the effectiveness of all these models, the plate center stresses, plate corner stresses, flat plate principal. Norton, design of machinery introduction to cam design. Unified supply sources the highest quality flat plate airport conveyor carousel parts available. They also have generated figures of cam profiles as enve.
Camshaft lobes are designed by starting with the lift curve, and working backwards to determine the lobe shape that will produce the lift curve. 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. The dip towards zero at the cam nose for design e can be. Least distance from the roller centre to the camshaft centre line, 50 mm. In case of flat faced followers, the cam curvature is the. A translating or a swing arm follower must be constrained to maintain contact with the cam profile. Cam and follower design basics design of cam profiles. The nearest approach of the follower to the cam center is 35 mm. The cam is the driver member and the follower is the driven member.
A typical flat plate collector is an insulated metal box with a glass or plastic cover called the glazing and a darkcolored absorber plate. The emphasis should be on the identification of the different types and their typical applications. Cams can provide unusual and irregular motions that may be impossible with the other types of mechanisms. We aim to keep emergency parts in stock and available. It is normally connected with a prime mover, which rotates it. Wedge cams a wedge cam has a wedge of specified contour. Structural steel flat plate construction by janis vacca, p. If so, the lifters with a new camshaft will result in will result in improper contact and early lifter and cam lobe failure. Fundamentals of post tensioned design for buildings. Plate or disk cams are the simplest and most common type of cam. Coverage of cam types, followers and input and output motions should be qualitative. 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. Diy flat plate solar collector design using a new concept.
The 07 is an lt1lt4 shaft which has a longer dowel pin and a center hole for the distributor. For a flat tappet cam, the radius of curvature is related to other cam parameters as follows. However, the manufacturing of cams is expensive and the wear effect due to the. Draw a simple design and add notes to explain your idea. 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 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. Made up of a flat plate or disc with an edge profile to transmit motion. A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion. Pdf plate cam mechanism can easily produce the positive and functional motions. Computeraided manufacturing cam and design cad software for printed circuit board pcb prototyping, supporting gerber, excellon drill files, gcode and visualization.
The nose of the hydraulic roller 08 is necked down to accommodate the cam retention plate. Radial cams are one of the most common types of cam. Prime circle radius base circle radius for knife edge and flat faced follower. The flat plate cam then reverses in the opposite direction and the follower drops and rises again. Cam mechanisms are widely used because with them, different types of motion. Design and analysis of cam mechanisms with a flatfaced.
Analysis and design of flat slab with and without shear. 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 radial cam may be a simple recognisable shape, such a circle or ellipse, or. A typical flatplate collector is an insulated metal box with a glass or plastic cover called the glazing and a darkcolored absorber plate. Flat plate collectors flat plate collectors are the most common solar collector for solar waterheating systems in homes and solar space heating. Wedge or flat cam free download as powerpoint presentation. Previous studies have shown that the design wind loads on the photco. 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. 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 the profile of the cam.
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. Aci 318 requires moments and shears in twoway posttensioned slab systems to be determined either by the equivalent frame method efm or. Allowing a follower to ride on this outer edge gives the follower a. Mechanical cam types and operation cams convert ordinary shaft rotation into a more complicated pattern of motion. Introduction of cams and types of cam and followers. The cam converts rotary motion of one element into reciprocating linear motion or into oscillatory motion. A more sophisticated example of a flat plate linear cam is shown below. Department af energy and torrns part of the solar pho. Here, the follower moves in a plane perpendicular to the axis of rotation of the camshaft.
The follower moves in a plane perpendicular to the axis of rotation of the camshaft. The radii of curvature of the three cam profiles are shown in fig. The flatplate worm gear combination was originally adapted for. 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. Cams and cam followers teacher linkedin slideshare. Cam and follower design basics design of cam profiles and. Wedge or flat cam machines applied and interdisciplinary. The diagram below shows a basic example of a flat plate cam linear cam. The disk or plate cam has an irregular contour to impart a specific motion to the follower. Scribd is the worlds largest social reading and publishing site. The calculation of the coordinates of the point p has two steps.
The same holds true for the first 1965 and 1966 396427 big blocks. Construction of displacement diagrams and calculation of velocities and accelerations of. The edge of the flat plate cam can be shaped to give different vertical movements of the cam follower. Flatplate collectors flatplate collectors are the most common solar collector for solar waterheating systems in homes and solar space heating. Several key terms are relevant in such a construction of plate cams. Even if the lifters look ok, the spherical shape may be worn flat. 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. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Comp cams general motors engine technical specs and. This video explains how to draw cam profile when out stroke of the follower is with s.
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. It is not necessary to enter into cam profile design procedures as these are time consuming and may be covered in other units. Draw the profile on the cam that will impart the following motion to the follower. To this end, equations for a number of standard types of displacement curves that can be used to address most highspeed. The manual cam layout method described in this section is used primarily for. Be sure to check the diameter and depth of the hole in the front, as well as the length of the dowel pin. The radial distance from the center of the disk is varied throughout the circumference of the cam. Pdf a hybrid approach for cam shape design and profile.
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. 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. 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. 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. Here are the highlights and key features of bendtech sm. Analysis and design of flat slab with and without shear wall. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. The paper presents an original method to determine the efficiency of a mechanism with cam and follower.
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. Then the condition that the whole segments of the cam profile are convex, and the coordinates of the cam profile are. Pdf optimal design of a cam mechanism with translating flat. Flat plate cam for more information and a worksheet go to.