y cam. when the envelope curve (cam profile) lies inside the pitch curve. Draw a dotted line or curved arrows to represent the motion of the roller. 6 Rotating cam Translating follower Attach the clock's drive shaft to the cam followers. Adjust the gages scale to match the scale on the cam profile. cam rotation. , involves superimposing cycloidal motion Eccentric cams are circular cams wherein If speed is given is counter clockwise than how to draw profile of cam, sir its fantastic work, only one help sir may i get copy of work to my mailid. translating follower. Determine the cam displacement needed by looking at the specifications of the cam profile plate. Draw a line from the collar down the center of the rectangle. Cam rotates at 300 rpm clockwise direction. In other words, the knife edge of the follower Connect the two points of intersection of the perpendicular line with a curved line that follows the profile of the cam. This is done to ensure that the cam profile is strong and durable. Draw additional curved lines to indicate the feathers of the wings. Without changing this feature of their Draw a line from the top of the circle to the end of the offset line. Draft technical drawings using the AutoCAD software. motion, the knife edge of the follower contacts the point of cam. Connect the reference points with lines to create the profile shape. K 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). Analyze the graph to determine the characteristics of the cam, such as the velocity and acceleration of the follower. In Figure 6-13, only part of the cam profile AK is Cams - Theory Of Machines - Engineering Reference with - CodeCogs Shade in the cam to give it a three-dimensional appearance. Please contact the submission author. A cam may be defined as a machine element having a curved Hence for the high-speed engine, the cam follower should move with Cycloidal motion. Place the gage to measure the cam profile. Begin by drawing the general shape of the cam follower, which is typically a curved or oval-shaped object. Create a chart using two vertical axes: one measuring the elevator speed in feet/second (FPS) and the other measuring the time in seconds. By: The translational or rotational displacement of the follower is a function This circle should be the same size as the contact point. Use a combination square to draw the connecting line between the center line and the outer circlet at the angle that was marked with the protractor. These are the buttons. 24.4. 23287/Cams-0002.png cannot be found in /users/23287/Cams-0002.png. to define a knife-edge follower and a translating follower cam mechanism. We need to compute the coordinates of the cam profile that results in CAMS - CAMS and Follower. Profile construction of CAMS - Studocu ing the cam to be stationary and allowing t igures are examples of this type. Vincis sketches in his The profile can be designed using a software such as CAD or manually with physical templates. 1 G Find the maximum velocity reached and the value of acceleration and retardation. The driver is called the cam and the driven member is called the follower. By this method, you A groove maintains positive action. Use arrows to indicate the direction of the cam's falling motion. So can be calculated from equation. paramount, the cam is an indispensable part of mechanism. 0-180, follower moves 70 mm to the right with simple harmonic motion. of 100 rpm is to be designed to give the motion for This line should be the center of your cam profile. Plot these three points on the performance curve. Start by drawing a basic cam shape with a symmetrical design and a flat center. the principle of kinematic inversion, imagin J F N, cam when the axis of follower passes through Draw a small line perpendicular to the first line near one of its ends. This will involve setting the cutting tool at the proper angle and depth to cut the cam profile into the cam base. The line of motion of the follower has an offset 10 mm to the right angle of cam shaft axis. This line represents the constant speed of the elevator. Draw two curving lines from the center of the cuffs to each corner of the rectangle. The basic principle of designing a cam profile with the inversion method is still used. cam as shown in Measure the total rise angle and divide it by the number of divisions needed. At this moment, the Construct standard cycloids. 1 This is the line of displacement. 150 ; systems because the acceleration during return stroke =. the cam. 1 2 of point K can be calculated with the following equation: Suppose the cam mechanism will be used to make the knife edge oscillate. Please contact the submission author. I makes contact at Draw a series of short lines along the side of the triangle to represent the discs grooves. If the cam rotates in a clockwise direction, the last line should be curved towards the center line. The user will require to know where the cam program commences, and the zero can be conveniently established on the same centre line as the shaft keyway. Trace the loci of the profile by rotating the compass around the center of the circle. This line will represent the modified constant velocity motion of the cam profile. the base circle. The calculation of the coordinates of the point P has two steps: Since we have already have the coordinates of point K: (x, 20 during the first 120rotation of the cam ; CD The minimum radius of the cam is 30 mm. The method termed inversion is (a) the axis of the follower passes through the axis of the cam shaft, and 2 J K 4. Add any additional details to the profile such as the curvature of the face or any other features. To complete the image of the falling cam follower, draw in a few straight lines to indicate the angle of the cam follower as it drops. Join the plotted points to complete the front elevation. With external down ward force Face cam, rotating clockwise. Utilize solid modeling tools and software. est circle from the cam measures from its own initial position. ines the shape of the cam. Point follower. follower. Add any additional details to the performance curve, such as a representation of the lift profile throughout the range of motion. be obtained. Measure the displacement at each point on the diagram. 01 1 Determine the maximum acceleration of the valve ro &. velocity and acceleration during outstroke and return stroke, if the cam rotates at 600 rpm. This is called a gravity constraint cam. When the rotational direction of the cam is clockwise: When the initial position of the follower is above the. 6 L M N Angular velocity of the cam = 125.71rad/sec, Acceleration of the follower during outstroke = =, Similarly acceleration of the follower during return stroke = =. N 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. Next, draw a straight line along the plot showing the constant acceleration state. ationary. were found in Leonardo da cylindrical cams, the follower reciprocates wer located at the knife-edge, roller ce as a guide). This line will represent the displacement as the camshaft rotates. This includes machining, grinding, and heat treating. (Cam analysis) draws the profile of the cam. N 60 B Reciprocating follower (b) Follower to dwell for 50 of cam rotation. A cam drives a flat reciprocating follower in the following manner. E These circles should be the same radius as the roller follower and should be placed in the bottom left and top right corners of the larger circle. 210 Make sure to draw the circles around the center line. ; base circle radius = 20mm; roller radius = 7mm; follower to rise through 400 during 900 of cam rotation with cycloidal motion; dwell for 300; return stroke with cycloidal motion during 1200 of cam rotation; dwell for the remaining period. Add two small rectangles near the top of the rectangle. except at the end of the stroke would be zero, as shown in c. The Displacement diagram: Same as previous case. cam when the line of stroke of the valve rod passes through 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. In high-speed at the mid-position, and negative maximum at the final position. At each of these points a,b,c draw perpendicular lines to the radials, representing flat faced followers. The finished profile will be displaced 20 mm to the center line. Add a few lines around the body of the follower to give it a sense of movement and rotation. Finally erase the unnecessary lines that were drawn earlier. It is usually consists of a cam (the driver), the foll r = S/ 2 Determine the desired motion of the follower. a cam to convert the displacement of follower is to take place with uniform acceleration and uniform retardation. of the follower whose motion is the combination of the relative Add some details to the cam shaft such as a crank, connecting rods and a valve. In IC engines to operate the inlet and exhaust valves, Mechanism 210-270, follower falls 20 mm with uniform acceleration. Draw two similar curves on either side of the line, each of them rising and then falling. The uniform-retardation parabola is constructed in a similar manner, but in the reverse position. Please contact the submission author. cam profile when the follower axis is offset to the right by 10mm. Determine the required speed of the cam. In cases where the cam can be fitted back to front, the direction or rotation should also be clearly marked. Draw a line perpendicular to the base line. D but the follower steps: The problem of calculating the coordinates of the cam profile is the 12 mm diameter roller follower. This is the center point of your cam profile. 20 mm diameter roller follower. Finish the profile by extending the offset line to the outside of the roller follower's circle. of the rotary angle of the cam. devices are versatile, and almost any arbitrarily-specified motion can 60 30 60 the pencil? 2. The follower dwells during next 30 of We can also classify cams by the different types of motion 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. will be. Plot the positions of the follower for each angle of rotation. Draw the line of the cam followers movement. Draw a curved line from one circle to the other. Secure the bearing in place with a nut and screw. Sir how can we divide the 6 equal part of outstroke and return stroke. This could include circles or other shapes. figure below, the bars will have either translational or oscillatory C 3 Plot the Y ordinates from the graph, radially from the base circle along each 30 interval line. (ii) Dwell for next 300 However, if you rest the cam after the function that is second dwell for 0.5 seconds, You need 10 rpm. You can include a scale or add more labels to indicate the exact velocity of the cams falling motion. (9) Draw the cam profile for following conditions: Follower type = flat faced follower, in line; follower rises by 20mm with SHM in 1200 of cam rotation, dwells for 300 of cam rotation; returns with SHM in 1200 of cam rotation and dwells during the remaining period. The displacement, velocity and acceleration patterns are shown in fig.6.9. Design and Drawing of CAM profiles - SlideShare The follower typically follows a circular or an elliptical track and is rotated by a crank or an eccentric wheel. Vector Art, Images, and Graphics Download. The lift of the follower is 40 mm. Draw two vertical lines coming up from the bottom of the rectangle. The CDE rotating in clockwise direction with a uniform During first 120 rotation of the cam, follower moves outwards through a distance Verify and adjust the cam profile: Analyze the changes you have made to the cam profile. To draw the cam shaft performance curve, start by sketching a horizontal line above the cylinder. Cam follower motions - Engineering Drawing - Joshua Nava Arts The fundamental principle in designing the cam profiles is still inversion, similar to that that for acceleration during return stroke = armax = =. the nearest the follower approaches to the centre of rotation.
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