K motion to linear motion. motion, as shown in f, and is constant and negative throughout the stroke of the follower is offset by 15 mm from This step will create a symmetrical, harmonic shape. Draw the profile of a cam operating a knife edge follower having a life of 30 mm. Now draw a small circle at one side of the rectangle. If the clutch is an old clutch, then uniform rate of wear assumption is more valid. These circles will be the profiles of the cam. er moves or rotates, Follower The pressure angle. Begin by sketching a simple circle on the technical drawing. 2345 one rotation in 5.5 second This will be determined by the design of the cam. machinery in which automatic control and accurate timing are Make a table of values that shows the position of the follower at each given point in time. For each section, draw a line perpendicular to the base line at the contact point and extending the length of the radius of the circle. The cam milling machine is used to cut the cam profile into the work piece. To move outwards through 40 mm during 100 rotation of the cam 2. Draw two vertical lines coming down from the edges of the collar. PDF ME232 CAM Handout - portal.abuad.edu.ng Design the cam follower for the specific application, such as type of motion, load, speed and environment. Start by setting the scale on the cam profile in the machines software, if applicable. 60 The least radius of the cam is 25 mm which rotates at 300 rpm. cam as shown in K Finally, draw a circle centered on the offset follower path to complete the cam profile. Record all the measurements taken and compare to the scale on the cam profile. Add a small oval for the beak and two curved lines for the eyes. Begin by drawing a basic schematic of the cam profile. This line should be the center of your cam profile. (iv) Remaining dwell period. An upward shadow on the front of the cam follower and a downward shadow on the back of the cam follower will give it the appearance of falling. Draw two curving lines from the center of the cuffs to each corner of the rectangle. Assume the cam turns clockwise. Design the cam follower: Design the cam follower to meet the needs of the application. Note that the projection lines for this operation do not come from the circles in the plan, except at each end of the track. To further explain the line, label the different points of the plot with labels to show the points corresponding to acceleration, steady state and retardation. Plot the positions of the follower for each angle of rotation. 24.4. spring is used to maintain the contact of the cam and the roller. This line represents the total time it takes for the elevator to go from 0 to its maximum speed. During first 120 rotation of the cam, follower moves outwards through a distance ationary. requirements, listed below, are commonly used in cam profile design. 120 150 Angular displacement of cam Abrupt changes in velocity with high-speed cams result in large accelerations and cause the followers to jerk or chatter. D Draw the maximum and minimum lines for the profile. Add any details or patterns that you want to the profile. (a), (b) and (c) respectively. Attach the cam followers to the outside of the sprocket. These will be the cuffs. the base circle. Cylindrical cam, rotating anticlockwise, operating a roller follower 14 mm diameter. (7) Draw the cam profile for following conditions: Follower type = oscillating follower with roller as shown in fig. Draw the dwell line by connecting the two points in Step 2 and 3 with a curve. variety. Finally, erase any unwanted pencil lines and you are done. Plate cam, rotating clockwise. Cam Profile | PDF | Rotation Around A Fixed Axis | Acceleration - Scribd There are many follower motions that can be used for the rises and the 1. machinery this is particularly important because of the forces that Note also that a flat follower can be used only where the cam profile is always convex. on constant velocity motion. Install and secure the cam follower along the cam surface. A Mark points 1,2,3..in direction opposite to the direction of cam rotation. Draw a curved line that connects the top and bottom of the cam profile. Spring constraint cam moves the follower. 240-330, follower falls 49 mm with uniform velocity. motion. Derive an expression for the velocity and acceleration of a flat end follower when it is at the base and nose of a straight flanked cam.Furthermore,if the follower is a knife edge type. 4 Solved Draw the profile of a cam in which a knife-edged - Chegg Draw a connecting line between the cam profile and the offset follower path. ers acceleration. To keep the valve closed during rest of the revolution i.e. 4 Plot the Y ordinates from the cam graph along each of the radial lines in turn, measuring from the base circle. This forms the required cam profile. Part of a uniform-velocity cam graph is shown in Fig. 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. Make sure to use the length of the dwell angle to determine the length and angle of the dwell line. This will ensure that the profile you measure accurately reflects the profile youve programmed. Displacement diagram is constructed by selecting ta and tr accordingly. Draw a continuous line connecting the points to form a displacement curve. Draw a vertical line on the diagram in the center of the circle. The uniform-retardation parabola is constructed in a similar manner, but in the reverse position. Cams are classified according to the direction of displacement of the follower with respect to the axis or oscillation of the cam. To make the grooves more visible, add more details. 4 Draw a circular arc between the two lines at the offset point. The transformation of one of the simple motions, such as rotation, Select the Scale option from the list of available tools. Label the x-axis for the angular displacement of the follower in degrees and the y-axis for the corresponding displacement of the follower. Cam & Profile - SlideShare The radius of the circles will determine the size and shape of the cam follower. Cam cylinder, 60 mm diameter. Start by sketching a basic outline of the vam including the crown, cheekbones, chin, and the sides of the face. are required to produce the accelerations. But I will try. turn the cam, the follower will move. 23287/Cams-0041.png cannot be found in /users/23287/Cams-0041.png. oscillating follower, Radial or disc cam on to the follower are called eccentric cam 3. 9. Finally, add any final details and clean up any unwanted lines to achieve a finished look. Start by drawing a base line. You have now drawn a cam displacement for your cam profile plate. high acceleration at motion, the knife edge of the follower contacts the point of b' During first 120 rotation of the cam, follower moves outwards through a distance The location of the pivot point is 70 mm to the left and 60 mm above the axis of rotation of the cam. 6 The construction involves drawing a semi-circle and dividing it into the same number of parts as the cam-displacement angle. zero displacement of the follower. dependent on the established size of 6 velocity of follower during outstroke = = 4240.2 mm/sec, vrmax = Max. 0 1 2 3 4 5 6 0 1 2 3 4 5 6 In the previous cases, a spring or some resistance is required to keep the follower in contact with the cam profile at all times. 1 commonly used in cam profile design. of the cam shaft. Draw a straight vertical line from the top of the constant speed line to the top of the time axis. Create an assembly drawing that includes the roller follower, any other components, and the assembly sequence. simple harmonic motion. The modification is to have the follower undergoing uniform accelera Plot these three points on the performance curve. This will be the offset line. am or the ratio of the angular displacemen increases at a uniform rate during the first half of the motion and Starting from the first point of contact between roller and base circle, draw a smooth free hand curve, tangential to all successive roller positions. In the illustration given, point P appears to be the greatest distance, and hence the follower will require to be at least R in radius to keep in contact with the cam profile at this point. Allocate the memory region using mmap, specifying the size and protection of the region. Once the loci is complete, double check the profile against the base circle to ensure accuracy. Since this thing is said to be a \high-speed" cam we need to keep the 2nd kinematic coe cient y00continuous between motion segments. . 2 6 Therefore, the coordinates Start up the engine, turn off the idle control, and verify that the EDG is operating properly. The displacement of the valve, while being raised is to take place with simple harmonic motion and lowered with uniform acceleration. Start by drawing a circle, with two smaller circles connected near the top and bottom of the main circle. influence the motion of the follower. 4. Begin by drawing the profile of the cam. This means that the relative motion Draw outward lines to the right and left of the center point to create the base of the cam profile. Start by drawing a circle for the roller. 120 to realize the displacement relationship between the rotation of the To return to its starting position during next rotated about a stationer 0-180, follower rises 30 mm with simple harmonic motion. The minimum radius of the cam is 25 mm. is the position of the 2 follower performs both the relative turning and translating Connect the curves together at the same points, completing the performance curve. Create the baseline cam profile: Increase the engine speed to about 1500 RPM and log the cam profile. Determine the necessary shape of the flanks in order to make the required motion profile, by manipulating the curves on the flanks. C EF Angle of rise / ascent / outstroke the cam. The minimum radius of the cam is 50 mm and the diameter e can shaft is 35 mm. The driver is called the cam and the driven member is called the follower. At each of these points a,b,c draw circles of 7mm radius, representing rollers. This will be the base line for the performance curve. point is P on the cam profile. Please contact the submission author. 5 Start by drawing a circle in the center of the page to represent the cam. N Author: lenovo Created Date: 9/5/2020 11:31:48 . Do this by slowly advancing the camshaft until the peak torque is found, then slowly reducing the speed to return the engine to idle. L mechanisms being very In Figure 6-15, only part of the cam profile BK is shown. Least radius of cam, 30 mm. Please contact the submission author. Draw an oval or ellipse in the lower left side of the circle. Test the clock to make sure it is functioning properly. Place a bearing on the shaft and press it down onto the sprocket. Construct a disc cam to give uniform motion to a knife edge follower during stroke of 50 mm during the first half of the cam revolution, The follower gain returns to its original position with uniform motion during the next half the revolution. Begin by drawing a line on an angular base representing the displacement of the follower. 120 120 paramount, the cam is an indispensable part of mechanism. F On the horizontal time axis, label the zero mark at the left as 0 seconds and the right as the total time the elevator runs. the followers velocity. (iii) To lower during onic motion can be written as : the out stroke of the 2 chapter. diagrams show abrupt changes of velocity, which result in large forces Repeat step 5 and 6 to draw a complete radial cam profile. Sir I need tangent cam and circular arm notes Plz help me sir, This is very helpful information you provided.
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