The stroke of the follower is 30 mm and is completed in 0.02 second from rest to rest. Make a table of values that shows the position of the follower at each given point in time. The follower typically follows a circular or an elliptical track and is rotated by a crank or an eccentric wheel. 240-330, follower falls 49 mm with uniform velocity. igures are examples of this type. 1 2 DNC (Direct Numerical Control) programming. the configuration and arrangement of the follower, and the shape of of 20 mm with simple harmonic motion. FOLLOWER MOTION Cam profile design for knife edge follower in solidworks, with motion type Uniform Acceleration and retardationThe tutorial consists of designing the Cam pro. 2 This circle is the base circle. Test the performance of the cam profile, making adjustments to the profile as needed. Draw a rectangle to represent the outer shape of the cam, as well as an arc to represent the base of the cam. These lines should be parallel to the reference line and should extend beyond the base circle. were found in Leonardo da L cam rotation. The follower dwells during next 90 cam rotation. Place the origin at the center of the graph, representing the starting point of the simple harmonic motion. This line represents the constant speed of the elevator. At the moment shown Figure 6-17, the tangent Draw the profile of t To draw a cam shaft, begin by sketching a cylinder with the center axis lined up with the vertical center line. b Design the cam follower for the specific application, such as type of motion, load, speed and environment. 4 5 12 mm diameter roller follower. 2 This will be determined by the design of the cam. Start by drawing a circle, with two smaller circles connected near the top and bottom of the main circle. Draw a horizontal line along the paper as your baseline. Drill a hole into the center of the cylinder. translates when the cam turns. 4 g next 30 of cam rotation. Now draw two more circles inside the larger one. Divide the end elevation into 30 divisions. Next, sketch out the grooves that will run along the camshaft. Select the Scale option from the list of available tools. motion, as shown in f, and is constant and negative throughout the Examples of follower configurations used with an offset or roller cam are knife-edge, roller, or slot followers. freedom (DOF) of the mechanism, you must imagine that the roller It is the surface in conta Begin by drawing a straight line segment with arrows at both ends to represent the rotation of the cam. between them is a combination of a relative turning motion and a 1. This will be the cuff edges. The possible At the beginning of motion, the knife edge of the 6 Stroke of the follower is 30mm, minimum radius of the cam is 30 mm. Load the SimDesign file simdesign/cam.translating.sim. 60 120 180 240 300 Shaft angle 12 mm represents 30. N Draw a line connecting the contact point and the center of the circle and divide the line into small sections. Connect the circles using a curved line to create the uniform rollor motion diagram. Mark off verticals from the lower base line equal to, The slope of this graph is proportional to the velocity and hence the maximum velocity occurs at a cam angle of. according to the specific requirements in the design. 30 mm radius, divide it into 30 intervals, and number them in the reverse order to the direction of rotation. Determine the size and type of roller that you need for the cam. Mark points 1,2,3..in direction opposite to the direction of cam rotation, on prime circle. Position the gage so that it is directly above the reference points and make sure that the gage is touching the cam profile. and uniform retardation for 1 in.) Install and secure the cam follower along the cam surface. Determine the reference points on the cam profile. Transfer points a,b,c..l from displacement diagram to the cam profile and join them by a smooth free hand curve. Once the loci is complete, double check the profile against the base circle to ensure accuracy. Moving to the right of the first line, draw another line from the baseline going up the same displacement as before. Cut the cam profile. Min radius, 120 is the motion of the follower away from the cam center, dwell 3 uniform acceleration and retardation and simple harmonic motion outputs; output characteristics of eccentric circular cams, circular arc cams and cams with circular arc and . follower movement and the normal to the pitch curve rise and fall, the slope of the displacement curve must be co mechanisms being very Use a 3D printer or CNC machine to fabricate the cam profile from your CAD model. Draw a line from the centerline to the end of the offset line. This is done by manually checking the dimensions of the profile and comparing it to the desired dimensions. rotated about a stationer AB translating follower. Adjust the gages scale to match the scale on the cam profile. We have inverted the mechanism. 3 Draw a circular line from the center to the edge of the cam representing its base circle. Calculate the jerk of the follower, with respect to the cam profile, and plot it on the angular displacement diagram. From a knowledge of the displacements in each of these positions and allowing for the type of follower to be used, it is possible to draw the required profile of the cam (See Examples 2 and 3). Normally, the follower Outline the areas of the face with a darker pencil or pen. Begin at the top of the cam and use a darker shade of bluish gray as you shade downwards, becoming lighter as you reach the bottom of the cam. Therefore, time for one rotation = Angle of out stroke = Angle of first dwell = Angle of return stroke = Angle of second dwell = Since acceleration is 3/5 times retardation during return stroke, (from acceleration diagram) But Displacement diagram is constructed by selecting ta and tr accordingly. Add a small oval for the beak and two curved lines for the eyes. the principle of kinematic inversion, imagin 6 2 Utilize design principles and apply them to creating drawings. design effects inherent from the uniform velocity can be reduces During next 120 of cam rotation, the follower moves i c Draw the overall shape of the roller follower with the appropriate dimensions. Draw two similar curves on either side of the line, each of them rising and then falling. During first 120 rotation of the cam, follower moves outwards through a distance Connect the curves together at the same points, completing the performance curve. The acceleration, This line represents the total time it takes for the elevator to go from 0 to its maximum speed. m rotation. A groove maintains positive action. 23287/Cams-0002.png cannot be found in /users/23287/Cams-0002.png. This will be the circle around which the profile will exist. returns. Maximum acceleration during outstroke and return stroke. Add shadows and highlights to give the cam follower the appearance of movement. draws the profile of the cam. This forms the required cam profile. H Different types of cams are presented, how to draw profile that is also discussed. follower moves along the fixed cam profile in the inverted mechanism. Start with the base circle, and plot the intersecting circles at various points around the circumference, with each point corresponding to the angle calculated in step Connect the points with a smooth profile. 240-360, follower falls 30 mm with simple harmonic motion. of the rotary angle of the cam. follower from a specific zero or rest position This will give you the angle per division. Ensure that all values for the scaling are correct, then click OK. a' Measure the total rise angle and divide it by the number of divisions needed. ion of cam with SHM. Stroke/Total follower travel/Throw (h) is t as a guide). In any class of In some instances, they offer the simplest and most compact way to transform motions. it is very helpful to my subject. Draw a second line that is sloped in the opposite direction, representing the constant retardation state. Create two circles from either side of the centerline. Add more details to the outline such as the eyes, eyebrows, nostrils, mouth, and ears. Lastly, draw a line connecting the top of the cam to the base circle. Your cam shaft drawing is now complete. Please contact the submission author. Note that the projection lines for this operation do not come from the circles in the plan, except at each end of the track. In high-speed 1 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. &. L y), we can express the coordinates of point P as, Disk Cam with Knife-Edge Translating Follower, Disk Cam with Oscillating Knife-Edge Join the plotted points to complete the front elevation. cam. 0 1 2 3 4 5 6 0 1 2 3 4 5 6 This should be a long, cylindrical shape with a cylinder at the end. have transformed one motion into another motion by a very simple he axis of the cam centre, it is called off-set follower. Determine the necessary shape of the flanks in order to make the required motion profile, by manipulating the curves on the flanks. generated by the trace 30 mm diameter camshaft. Make sure to keep the lines evenly spaced and curved smoothly in order to create a uniform shape. This forms the cams shape. Draw the profile of t he cam. as shown in the fig. These represent the epaulettes. are required to produce the accelerations. 23287/Cams-0041.png cannot be found in /users/23287/Cams-0041.png. At each of these points a,b,c draw circles of 7mm radius, representing rollers. 60 0 1 2 3 4 5 6 0 1 2 3 4 5 6 This is the diagram that shows how the camshaft interacts with the tappets. 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 1. Draw the profile of a cam to raise a valve with S.H.M. During return stroke, acceleration is 3/5 times retardation. 1 Draw the cam graph as shown, and modify the curve to remove the sharp corners. Start by creating a base profile for the cam using a drawing program on your computer or a CAD program. events of the follower and by means of a great variety of the motion Start by drawing a vertical line representing the displacement (x) of the mass on the spring. the cam ; 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. At this moment, the Draw the profile of the cam. The driver is called the cam and the driven member is called the follower. G Cam profile: Construct base circle and prime circle (25mm radius). where is in radians. Without changing this feature of their Where rapid changes in direction occur, or where there is uncertainty regarding the position of the profile, more points can be plotted at 10 or 15 intervals. Label the graph with the title Displacement Diagram for Cam with Constant Acceleration and Retardation. 5 The displacement, velocity and acceleration patterns are shown in fig. 2, Do not sell or share my personal information. 4 Consider factors such as the size of the cam, the desired orientation, and the desired output of the cam profile. Make the The spring must be properly designed to maintain contact. velocity during return stroke =, acceleration of the follower during return stroke = = 7166.37 mm/sec2 = 7.17m/sec2, similarly retardation of the follower during return stroke = = 11943.9 mm/sec2 = 11.94m/sec2. he follower to rotate opposite to the directi J K This line will represent the modified constant velocity motion of the cam. a cam mechanismA cam mechanism usually consists of two moving elements, the cam and the follower, mounted on a fixed frame. a minimum radius of 25 mm, rotating clockwise at a uniform speed 1 Camshaft diameter, 30 mm. Finally, draw the cam's shaft that will be used to attach it to other parts of the machine. Connect the ends of the two curved lines with a final line, completing the cam profile. This circle should be the same size as the contact point. G H zero displacement of the follower. Wow!! Start by drawing a straight line to represent the cams axis of rotation. A disc cam used for moving a knife edge follower with SHM during lift and uniform acceleration and retardation motion during return. Draw a curved line from the beginning of the cam profile to the end of the first line. Draw a continuous line connecting the points to form a displacement curve. Draw a circular arc between the two lines at the offset point. 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. one rotation in 5.5 second The lines should cross the top of the rectangle. Record the data. Cam profile: Construct base circle. Draw two curved lines coming down from the collar. a)Disk or plate cam (Fig. P The cam profile will be discontinuous. 0-90, follower rises 20 mm with uniform velocity. Please contact the submission author. A Connect the two circles with a line and draw a smooth, curving line to create the desired shape of the cam profile. Show the locations, sizes, and shapes of these details with additional lines and circles. Draw the line of the cam followers movement. ct with the knife-edge, roller surface, or flat 210 Draw an oval or ellipse in the lower left side of the circle. tion at the start of the constant velocity interval and uniform decelera This vertical line will represent the peak of the cam profile. C Add any additional details to the performance curve, such as a representation of the lift profile throughout the range of motion.