3 Plot the Y ordinates from the graph, radially from the base circle along each 30 interval line. Also determine the max. Connect the ends of the two curved lines with a final line, completing the cam profile. Rotating cam Translating follower Mark the positions of the roller bearing axles. requirements, listed below, are commonly used in cam profile design. This will be the pocket button. Draw a line from the base circle to the edge of the cam and make sure it follows the modified constant velocity profile. PRESSURE Draw a curved line starting at the left mark and ending at the right mark. BASIC PRINCIPLE, to give the following motion to a knife-edged follower : Add a few lines around the body of the follower to give it a sense of movement and rotation. P Draw a second curved line starting at the left mark and ending at the right mark, this line should be offset from the first line by 20 mm. Draw a circle at each point for the roller follower. G H second half. Start by sketching the desired motion of the cam. Begin by making sure you have a blank paper or a CAD software program to draw your cam profile plate on. Add labels to the graph to identify the points along the curve where the cam is at its highest and/or lowest point. B Design the profile of the cam. 6-7g will impart simple harmonic motion to the rotated about a stationer This involves deciding the cam contour and the desired movement of the follower. uniform acceleration and retardation are shown in Fig. N 0-180, rise 64 mm with simple harmonic motion. This line should start at one end of the rotation and end at the other. To return to its starting position during next Add the tappets, which are small cylinders that protrude out from the camshaft. Draw another curved line from the center of the cam profile to the end of the second line. Finally, draw an arc connecting the horizontal line of displacement with the lines of force to complete the simple harmonic motion. Add some details to the cam shaft such as a crank, connecting rods and a valve. a cam to convert Begin by drawing a circle on your paper. E It is the surface in conta (7) Draw the cam profile for following conditions: Follower type = oscillating follower with roller as shown in fig. Construct the profile using a cam milling machine. 40mm 12 mm diameter roller follower. Connect the two lines, creating a triangle shape, with the point of the triangle intersecting the middle of the main circle, and the base of the triangle connecting to the two smaller circles. Use of templates and stencils (for simple profile designs). Sir I need tangent cam and circular arm notes Plz help me sir, This is very helpful information you provided. minimum radius of the cam is 25 mm. a roller follower as follows. from the cam centre. A1 D between the follower and the line passes through two pivots should be 4 !The solved examples has helped me a lot. Draw a horizontal line intersecting the vertical line at the equilibrium point, which is the point of no displacement. Take a pencil and a book to do an experiment as shown above. School of Technology r angle through which the follow by of the follower is which turning and the relative translating. This will be the cuff edges. Therefore, the coordinates Draw the displacement diagram and profile of the cam. B 1 Erase any unnecessary lines and your cam shaft and performance curve are complete! Transfer points a,b,c.. on to these arcs from displacement diagram. It can be calculated from There are many follower motions that can be used for the rises and the This can be done by calculating the position of the follower for each angle, or by using a lookup table if available. = 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. During first 120 rotation of the cam, follower moves outwards through a distance outline or a curved groove, which, by its oscillation or rotation pressure angle. 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 move outwards through 40 mm during 100 rotation of the cam 2. acceleration during return stroke =. Helpp! m rotation. Do this by slowly advancing the camshaft until the peak torque is found, then slowly reducing the speed to return the engine to idle. Using a protractor, draw the necessary angles between the flanks and the base circle, in order to make the desired motion profile. Draw a connecting line between the cam profile and the offset follower path. Draw the displacement, the velocity and the These circles will be the profiles of the cam. Label each interval with the appropriate speed/velocity value. Starting from the first point of contact between roller and base circle, draw a smooth free hand curve, tangential to all successive roller positions. This would include specifying the starting and ending points, the total travel, and the desired speed of travel. Connect the lines with smooth curves to create the cam profile. Label the various components of the cam design with letters or numbers to make it easier to reference them later on. next 30. on of cam rotation. A acceleration during outstroke = aomax = r2p (from d3) = =, Similarly, Max. Angle of rise / ascent / outstroke This is the basic idea of a cam. If the plate follower moves along a curved path, draw a curved line instead of a straight line. 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. 6 Draw a series of short lines along the side of the triangle to represent the discs grooves. 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. DNC (Direct Numerical Control) programming. Check the cam profile for accuracy. The flat follower requires that everywhere the surface of the cam is convex. Draw the lobes of the camshaft. 5 CAMS - CAMS and Follower. Profile construction of CAMS - Studocu (a) the line of stroke of the valve rod passes through the axis of the cam shaft, and Falling Phase: As the cam continues to rotate, the follower descends back to its initial position. ower moves. This should include the base circle, the lift and dwell angles. The spring must be properly designed to maintain contact. Place the offset point at an equal distance along the circumference of both circles. Roller follower 2 Construct the cam profile and deduce the speed of rotation needed.
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