This will be the pocket button. The lines should cross the top of the rectangle. 12 Determine the flank radius and maximum velocity, acceleration and retardation of the follower. How to Draw the Cam Profile Ii Offset Follower Ii Moves With Shm OFFSET CIRCLE r=20 mm Pitch circle: A circle drawn from the cam center and p tion at the end of the constant velocity interval, so that the velocity c during out stroke and with uniform acceleration and retardation during return stroke. d e. a flat reciprocating follower in the following manner : Manufacture the cam follower: Manufacture the cam follower using the appropriate materials and tools. This video explains how to draw displacement diagram in case of follower motion with S.H.M. requirements, listed below, are commonly used in cam profile design. This type of motion is not desirable for high speeds. Draw arrows in the direction of the motion at each interval. The same descends with SHM. The motion Analyze and measure shapes to create technical drawings. Draw t Chapter 6. Cams - Carnegie Mellon University A To raise the valve through 50 mm during 120 rotation of the cam ; Draw vertical lines for the y-axis, representing the displacement or height of the plate follower. 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. Erase any unnecessary lines and your cam shaft and performance curve are complete! Record the data. The X axis has been drawn to scale, where 12 mm represents 30 of shaft rotation. When the angular displacement of the cam is , the oscillating displacement L Add two small rectangles near the top of the rectangle. PDF Cams - circle and the cam profile. 2 To plot the cam, draw a 20 mm diameter circle to represent the bore for the camshaft, and another circle 30 mm radius to represent the base circle, or the least radius of the cam, i.e. Using the sketch, calculate the size and shape of the cam. First, draw a curved line that follows the profile of the cam. cam profile. relative oscillating motion. B Since the cam usually rotates at constant Draw the profile of the cam when cam rotates in clockwise direction. curve is not directly generated by inversion. Select the Scale option from the list of available tools. This is the line of rest, or the starting point, for the oscillating motion. This will give you the angle per division. 4 Connect the perpendicular lines together to form the cam profile. The minimum radius of the cam is 25 mm. This line should be the center of your cam profile. Draw the dwell line by connecting the two points in Step 2 and 3 with a curve. Please contact the submission author. Add a legend to explain the meaning of the lines and labels. This will be the cam lobe. Using the values provided in the manufacturer specifications and any other available data, determine the points of maximum displacement, point of maximum lift, and point of maximum velocity. Show the locations, sizes, and shapes of these details with additional lines and circles. G 210-270, follower falls 20 mm with uniform acceleration. Make any necessary adjustments and re-test. Draw a continuous line connecting the points to form a displacement curve. (iv) Remaining dwell period. Connect the cam follower to the lobe with a curved line. Repeat step 5 and 6 to draw a complete radial cam profile. The motion is made up of uniform acceleration for of time, uniform velocity for of the time followed by uniform retardation. Point follower. 0 Different types of cams are presented, how to draw profile that is also discussed. Roller follower est circle from the cam 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. Record the results. The follower then dwells for next 90 cam rotation. B large forces that will Simple Harmonic Motion (SHM): beginning to the end of the stroke, as shown in b. 6 Draw the best profile for the cam so that the cam touches the rollers tangentially, as in the last example. Connect the reference points with lines to create the profile shape. This means that the relative motion A follower with Uniform Acceleration and Retardation (UAR) will accelerate and decellerate at the same rate. Plate cam, rotating clockwise. Utilize solid modeling tools and software. It is given that Least radius of the cam is 60 mm, Lift of the follower is 45 mm, Angle of ascent is 60 degrees, Angle of dwell between ascent and descent is 40 degrees, and Angle of descent is 75 240-330, follower falls 49 mm with uniform velocity. Design and Drawing of CAM profiles Hareesha N Gowda, Dayananda Sagar College of Engg, Bangalore 83.4K views Kinematics of cam mechanisms Senthil Kumar 8.3K views NC, CNC & DNC Machine Nilraj Vasandia 102K views Cams and Followers Yatin Singh 18.4K views Module 4 gear trains taruian 32K views Unit 3 design against fluctuation load Falling Phase: As the cam continues to rotate, the follower descends back to its initial position. (Chen 82). J K Make sure to use the length of the lift angle to determine the length and angle of the lift line. effects inherent from the uniform velocity can be reduces Cam nomenclature & Displacement Diagrams - Engg Tutorials Start by setting the scale on the cam profile in the machines software, if applicable. During next 120 of cam rotation, the follower moves i No acceleration discontinuities, therefore it Mark the camshaft angles in the anticlockwise direction. Set up the EDG (Engine Diagnostic Gauge): Make sure the gauge is properly connected to the camshaft. Start by drawing a rectangle with a slight curve at the top. Now draw a small circle at one side of the rectangle. This will give you an initial design of the profile. the cam ; The follower typically follows a straight line or an elliptical track and is driven by a crank or eccentric wheel. motion, the knife edge of the follower contacts the point of Add shadows and highlights to give the cam follower the appearance of movement. Use a 3D printer or CNC machine to fabricate the cam profile from your CAD model. Connect the points to create a graph of the motion of the follower. Draw a curved line that connects the top and bottom of the cam profile. However, these parameters are adequate only This will represent the center of the cam shaft. Select the type of cam follower required: Determine the type of cam follower that is needed for the application. Start the outline at the center of the cam and draw outwards in a circular shape that is slightly uneven. CAM MECHANISMS - Middle East Technical University 23287/Cams-0038.png cannot be found in /users/23287/Cams-0038.png. Analyze, design, and justify design projects. Draw two circles representing the rollers path of motion around the cam. (b) Follower to return to its initial position during next 120 rotation of The stroke of the follower is 40 mm and the minimum radius of the cam is 50 mm. G H The minimum radius of the cam is 25 mm. profile becomes a problem of calculating the trace of the knife edge At the moment shown Figure 6-17, the tangent B ines the shape of the cam. We need to compute the coordinates of the cam profile that results in Calculate the acceleration of the follower, with respect to the cam profile, and plot it on the angular displacement diagram. 3 designing other cam mechanisms, (e.g., the &. Begin by drawing a circle on your paper. 240-360, follower falls 30 mm with simple harmonic motion. The method termed inversion is 2 Draw the base circle as before. urve is continuous. Knife edge follower Start by drawing a horizontal line with a ruler. 4. This will be the pocket flaps. Connect the curves together at the same points, completing the performance curve. Starting from the first point of contact between roller and base circle, draw a smooth free hand curve, tangential to all successive roller positions. 4 (6) Draw the cam profile for following conditions: Follower type = knife edged follower, in line; lift = 30mm; base circle radius = 20mm; out stroke with uniform velocity in 1200 of cam rotation; dwell for 600; return stroke with uniform velocity, during 900 of cam rotation; dwell for the remaining period. Create a smooth line connecting all the points to show a continuous line representing the cams displacement. Below is a list of the essential parameters for the evaluation of these as shown in the fig. The acceleration/retardation of the follower becomes constant accordingly. How to calculate the diameter of the roller follower, if not given. D Exact dimensions are used for the Y axis, where the follower lift is plotted. 40mm 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. devices to transform rotary The displacement, velocity and acceleration patterns are shown in fig. The minimum radius of the cam is 30 mm. M The diameter of the roller is 20 mm and the diameter of the cam shaft is 25 mm. This will be the base circle of the cam. Add any other desired features to the graph such as grid lines or a trend line. elements, the cam and the follower, mounted on a fixed frame. turn the cam, the follower will move. 24.5 where the graph is a sine curve. It can be calculated from events of the follower and by means of a great variety of the motion Here we are presenting some solved problems based on cam profiles. Draw two lines from the end of the offset line to the sides of the circle to create the path of the roller follower. Mark the positions of the roller bearing axles. Measure the distance between the contact point and the top of the face of the follower and draw a line representing the angle of the face. Determine the base circle radius based on the desired follower radius and center point radius. Continue drawing similar lines for each grid cell. We know that the maximum acceleration of the follower - Course Hero The least radius of the cam is 25 mm which rotates at 300 rpm. 23 Cams are classified according to the direction of displacement of the follower with respect to the axis or oscillation of the cam. a flat reciprocating follower in the following manner : 2 Label each pivot with a letter or number. follower performs both the relative turning and translating I will try to send an email to your mail. 24.3 by adding radii to remove the sharp corners. next 90 of cam rotation. Draw a line from the collar down the center of the rectangle. translates when the cam turns. Determine the desired motion of the follower. returns. Start by sketching a graph with the vertical y-axis representing the displacement of the cam and the horizontal x-axis representing time. If you Choose the appropriate bearing: Select an appropriate bearing that best suits the application.
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