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The graph should now represent the simple harmonic motion of n4 draughting. 20 mm diameter roller follower set 20 mm to the right of the centre line for the camshaft. Erase any unnecessary lines and your cam profile with modified constant velocity motion is complete. diagrams show abrupt changes of velocity, which result in large forces (c) Follower to dwell during the next 120 of cam rotation. Since the cam usually rotates at constant 6 Draw the best profile for the cam so that the cam touches the rollers tangentially, as in the last example. 2 Draw the base circle as before. To give the cam a realistic, textured appearance, draw small, curved lines in the shaded area. The minimum radius of the cam is 25 mm. The graph passes through successive intersections as indicated. Thus, the problem of designing the cam Draw the cam profile when the line of the stroke is offset 20 mm from the axis of the cam shaft. Cams that produces simple harmonic moti Draw a series of parallel lines to represent each of the different cams that make up the cam design. These will be the cuffs. Construct the cam profile and deduce the speed of rotation needed. This is done to ensure that the cam profile is strong and durable. are tangential to the offset circle of 10mm dia. 4 Check the point of contact between the curve and each tangent and its distance from the radial line. Cam devices are versatile, and almost any arbitrarily-specified motion can be obtained. This type of motion gives the follower the smallest Add any additional details such as shaft collars, seals or dust shields as needed. next 90 of cam rotation. Poonam Savsani Begin by making sure you have a blank paper or a CAD software program to draw your cam profile plate on. During the first 90 rotation of the cam, the follower moves outward through a distance of 30 mm with SHM. urve is continuous. fig. d e. a flat reciprocating follower in the following manner : These forces are Cam profile: Construction is same as previous case, except that the lines drawn from 1,2,3. Create an assembly drawing that includes the roller follower, any other components, and the assembly sequence. the required motion of the follower. 3 Finally, colour your drawing and you're finished! The translational or rotational displacement of the follower is a function the base circle. to cylindrical cams, Draw the profile of the cam. Draw a line from the end of the lobe to the centre of the rectangle to form a flywheel. To complete the camshaft drawing, use darker pencils and pens to shade in the areas around the grooves. Draw a circular arc between the two lines at the offset point. The cam has a very important function To draw a cam shaft, begin by sketching a cylinder with the center axis lined up with the vertical center line. Choose the appropriate bearing: Select an appropriate bearing that best suits the application. he cam. Make sure to draw the circles around the center line. Draw arrows that point out the direction of motion at specific times. Ensure each division is accurately measured. Interpret and understand drawing conventions. Leonardo da Vinci Label the maximum displacement, the minimum displacement, and the equilibrium point of the curve. Plot these three points on the performance curve. 3 If we have 60 outstroke and 90 return stroke then how can I divide both of them in 6 equal parts . To reduce the shock on the follower, the cam graph can be modified as indicated in Fig. Draw a straight line. Test the cam follower to ensure proper operation and performance. coordinates of the knife edge of the follower should be (So + S, Add detail to the cam follower by adding a side view of the cam follower. Label the x-axis with the measurement of the motion, and the y-axis with the measurement of the displacement or height. Camshaft diameter, 30 mm. Finally, add any final details and clean up any unwanted lines to achieve a finished look. The follower moves with uniform velocity during both the outstroke and return strokes.