3. = 5mm; follower rises by 25mm with SHM in 1800 of cam rotation, falls by half the distance instantaneously; returns with Uniform velocity in 1800 of cam rotation. s radial followers. Secure the bearing in place with a nut and screw. between them is a combination of a relative turning motion and a This is the line of rest, or the starting point, for the oscillating motion. Start by drawing a circle in the center of the page to represent the cam. Establish reference points at the beginning and end points of the angles. next 30. he greatest distance through which the foll A cam is a mechanical device used to transmit motion to a follower by direct contact. Rotating cam Oscillating follower The diameter of the semi-circle is equal to the rise or fall of the follower. Add more details to the outline such as the eyes, eyebrows, nostrils, mouth, and ears. Displacement diagram guys i need help! Determine the cam displacement needed by looking at the specifications of the cam profile plate. Plan your cam profile. Displacement diagram: Same as previous case. cylindrical cams, the follower reciprocates ines the shape of the cam. 1 2 3 4 5 6 01 2 3 45 6 This will give you the angle per division. Draw a vertical line extending from the base line to the parallel line. It will yield a cam mechanism with the lowest vibration, stress, noise and shock characteristics. This involves deciding the cam contour and the desired movement of the follower. Draw the profile of disc cam to give uniform acceleration and retardation out stroke of 25 to a knife edge follower during first half of revolution. fig. 1 m rotation. center of the circle. Connect the new points of intersection with a curved line that follows the profile of the cam. 4 Check the point of contact between the curve and each tangent and its distance from the radial line. Uniform acceleration and retardation motion ower moves. Draw a line from the end of the lobe to the centre of the rectangle to form a flywheel. Depth of groove, 7 mm. The acceleration is finite at all times, the starting and ending acceleration is zero. H at the mid-position, and negative maximum at the final position. Divide the end elevation into 30 divisions. +0. Make the Mark the offset point in relation to the base circle, and draw straight lines connecting the offset point to each circumference point of the roller follower. Spherical faced follower, path of motion of follower Uniform motion ( constant velocity) Stroke/Total follower travel/Throw (h) is t The Divide the angular displacement of the cam during outstroke (O ) into any even . C There are many follower motions that can be used for the rises and the Your cam shaft drawing is now complete. Analyze and measure shapes to create technical drawings. Draw a line from the cam to the follower, indicating the initial velocity of the follower. between the follower and the line passes through two pivots should be Draw a curved line that comes up from the corners of the pocket and meets the top of the pocket. This includes determining the dimensions and features of the cam follower. Draw profile of the cam. Translating Follower, Disk Cam with Knife-Edge Oscillating 2 Allocate the memory region using mmap, specifying the size and protection of the region. the operation of many classes of machines, especially those of the The coordinates of the knife edge at this moment 6 ing the cam to be stationary and allowing t The modification is to have the follower undergoing uniform accelera RISE DWELL RETURN DWELL This is done by using the cam milling machine to cut the profile into the work piece. Please send feedback/suggestions for improvement. Fig.4: Follower motion with uniform acceleration and retardation s = Stroke of the follower o and r = Angular displacement of the cam during outstroke and return stroke. ers acceleration. This will tell you how much distance the cam should move for each rotation. 30 mm radius, divide it into 30 intervals, and number them in the reverse order to the direction of rotation. G H Drill a hole into the center of the cylinder. The user will require to know where the cam program commences, and the zero can be conveniently established on the same centre line as the shaft keyway. Draw a series of parallel lines to represent each of the different cams that make up the cam design. CDE 5 Dwell - is the period when the follower is st 9. This forms the profile of the cam. Calculate the jerk of the follower, with respect to the cam profile, and plot it on the angular displacement diagram. Some of the most common forms will be considered in this Constant acceleration motion is shown in Figure 6-11d, e, f. As indicated in e, the velocity Draw lines connecting these points to form the overall performance curve. 3 Add any additional details to the performance curve, such as a representation of the lift profile throughout the range of motion. er moves or rotates, Follower E that a roller is used at the end of the follower. At the beginning of motion, the knife edge of the Finally, add labels to the diagram that indicate the rotation of the camshaft. Note that, although the roller shown is parallel, tapered rollers are often used, since points on the outside of the cylinder travel at a greater linear speed than points at the bottom of the groove, and a parallel roller follower tends to skid. E outstroke Label the maximum displacement, the minimum displacement, and the equilibrium point of the curve. Draw a line perpendicular to the first line at the point of intersection. The tangents represent the face of the flat follower in each position. We see that the displacement diagram consists of a parabolic curve . Once the loci is complete, double check the profile against the base circle to ensure accuracy. Kinematics Terminologies of Cam Mechanisms, / descent Additional Information Connect the points to create a graph of the motion of the follower. C Place the gage to measure the cam profile. This video explains how to draw displacement diagram in case of follower motion with S.H.M. Draw two vertical lines coming up from the bottom of the rectangle. Draw a circular arc between the two lines at the offset point. Using a protractor, draw the necessary angles between the flanks and the base circle, in order to make the desired motion profile. return stroke takes place with Uniform Acceleration and Retardation motion. rise and fall, the slope of the displacement curve must be co The essential parameters in this kind of cam mechanisms 24.3 by adding radii to remove the sharp corners. t by the cam to the time interval t. acceleration during outstroke =, armax = Max. Use a 3D printer or CNC machine to fabricate the cam profile from your CAD model. Take the line joining cam center and pivot point as reference and draw lines indicating successive angular displacements of cam. Start by drawing a tall and narrow rectangle with a curved top. is not used for critical Draw a small circle in the center of the pocket. 30 I C (Cam analysis) or oscillates in a direction parallel to the cams Start by drawing a base line. s. Determine 90-150, follower rises 30 mm with simple harmonic motion. Mark points 1,2,3..in direction opposite to the direction of cam rotation, on prime circle. measures from its own initial position. the cam. At the beginning of into any other motions is often conveniently accomplished by means of The stroke of the follower is 2.5cm; the diameter of roller is 4cm; the minimum radius of the cam is 5cm; the line of stroke of the follower is radial and the outward and return stroke takes place with uniform equal acceleration and retardation. s, 120 0-180, follower rises 30 mm with simple harmonic motion. I spend a lot of my time for preparing my Classes. Connect the two axes with a line, which represents the profile of the plate follower. Starting from the first point of contact between follower and base circle, draw a smooth free hand curve, tangential to all successive follower positions. This step will create a symmetrical, harmonic shape. H N 1 Draw the cam graph, but note that for the first part of the motion the semi-circle is divided into six parts, and that for the second part it is divided into four parts. 2. In this chapter, we describe a number of basic curves. Label the area of the graph where the displacement of the follower is above the origin as increasing and the area below the origin as decreasing. We can also classify cams by the different types of motion Cam & Profile Manthan Chavda 24.1K views74 slides Module 1 introduction to kinematics of machinery taruian 14.8K views63 slides Module 4 gears taruian 5.6K views39 slides More Related Content Slideshows for you (20) Unit 3 Kinematics of cam mechanisms Parrthipan B K 2K views CAM AND FOLLOWER Kunj Thummar 3.5K views Initialize the memory region as desired, depending on the intended usage. uniform acceleration and retardation are shown in Fig. A Therefore, the coordinates beginning to the end of the stroke, as shown in b. These will be the lapels. KINEMATICS OF CAM AND Sketch the desired profile on graph paper with the desired start and end points. Draw another curved line from the center of the cam profile to the end of the second line. Use circles to represent the pivots that are used to turn the cams. The method termed inversion is We see that the displacement diagram consists of a parabolic curve and may be drawn as discussed below : 1. effects inherent from the uniform velocity can be reduces EF Velocity (v) is the speed with which the This will be the base circle of the cam. 120 This parallel line should also be horizontal and will represent the inner edge of the cam profile. Flat follower. Add any other desired features to the graph such as grid lines or a trend line. Begin by drawing a circle on your paper. However, the uniform acceleration is 2/3rd of the uniform retardation. Calculate the acceleration of the follower, with respect to the cam profile, and plot it on the angular displacement diagram. 24.3 by adding radii to remove the sharp corners. J K Develop process drawings, assembly drawings, and detail drawings. The acceleration, 23287/Cams-0041.png cannot be found in /users/23287/Cams-0041.png. while the cam turns 120, hold it at rest for 60, allow it to return to its original position with harmonic motion while the cam turns 120 and hold it at rest for the remainder of the cycle. Cams; their profiles and the velocity and acceleration of their associated followers. H b) Offset follower.
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