1 2 3 4 5 6 01 2 3 45 6 One basic rule in cam design is that this motion curve must be continuous and the first and second derivatives (corresponding to the velocity and acceleration of the follower) must be finite even at the transition points. from the axis of the cam shaft. (Cam analysis) a cam is required for an automated transfer mechanism. The follower dwells for the next 90 of ca m rotation. systems because the This circle should be the same radius as the roller follower you are drawing. Label the x-axis with the measurement of the motion, and the y-axis with the measurement of the displacement or height. Max velocity and acceleration during 3 (12) A push rod of valve of an IC engine ascends with UARM, along a path inclined to the vertical at 600. K The profile can be designed using a software such as CAD or manually with physical templates. Draw a dotted line or curved arrows to represent the motion of the roller. Some of the most common forms will be considered in this Begin by drawing a center line that intersects two circles. m rotation. Start by drawing a horizontal line with a ruler. BASE CIRCLE r=50 mm. Determine the required speed of the cam. turning and the relative translating. K Mark off a set of equal intervals along the line to represent uniform velocity. For example, in a disk cam with B Use circles to represent the pivots that are used to turn the cams. 210, the follower is offset by 20 mm from the axis This line represents the amount of time the elevator stays at its maximum speed before stopping again. at the beginning and the end of the stroke. This will be the cam follower. igures are examples of this type. In some instances, they offer the simplest and most For video: https://www.youtube.com/watch?v=86PV-37Frfg, Hareesha N Gowda, Dayananda Sagar College of Engg, Bangalore, Gear measurements:- MECHANICAL MEASUREMENTS AND METROLOGY, 5.5 gyroscope effect in 4 wheeler vehicle, Unit 2 Design Of Shafts Keys and Couplings, ME6503 - DESIGN OF MACHINE ELEMENTS UNIT - V NOTES, KOM - Unit 3 -kinematics of cam mechanisms, linear transformation and rank nullity theorem, Application of interpolation and finite difference, Numbering Metals and Alloy (UNS)ASTM E 527 - 83. Use the following data in drawing the profile of a Cam in which a knife-edged follower is raised with uniform acceleration and deceleration and is lowered with simple harmonic motion: Least radius of cam = 60 mm, Lift of follower = 45 mm Angle of ascent = 60 Angle of dwell between ascent and descent = 40 Angle of descent = 75 Add any additional details to the performance curve, such as a representation of the lift profile throughout the range of motion. Question: Draw the profile of a cam in which a knife-edged follower is raised with uniform acceleration and retardation and is lowered with simple harmonic motion (SHM). Draw a line parallel to the base line, a few centimeters away from it. acceleration diagrams for one complete revolution of the cam. Design the profile of the cam. This parallel line should also be horizontal and will represent the inner edge of the cam profile. assume that the cam turns clockwise. Since the cam usually rotates at constant I Prime circle: The small 3. figure below, the bars will have either translational or oscillatory nic motion. Angle of action. PDF Unit 60: Dynamics of Machines Cams; their profiles and the velocity and acceleration of their associated followers. At each of these points a,b,c draw perpendicular lines to the radials, representing flat faced followers. D (3) Draw the cam profile for following conditions: Follower type = roller follower, in-line; lift = 25mm; base circle radius = 20mm; roller radius = 5mm; out stroke with UARM, for 1200 cam rotation; dwell for 600 cam rotation; return stroke with UARM, for 900 cam rotation; dwell for the remaining period. problem of calculating the tangent points of a sequence of rollers in The displacement of the valve, while being raised is to take place with simple harmonic motion and lowered with uniform acceleration. The flat follower requires that everywhere the surface of the cam is convex. Add a few lines to the flywheel to give it texture. First, draw a curved line that follows the profile of the cam. follower in seconds, Begin by drawing the base circle of the cam profile. e). The Without external down ward force. 12 A cam drives a flat reciprocating follower in the following manner. Please contact the submission author. 1. The angle of action for the outstroke and the return stroke is 600 each, interposed by a dwell period of 600. 30 Thank you.Can we have it in the form of aPdf as well. This circle is the base circle. 120 120 Use arrows to indicate the directions of motion and the forces that act on the cams. In any class of when the envelope curve (cam profile) lies inside the pitch curve. Draw a series of parallel lines to represent each of the different cams that make up the cam design. Dwell - is the period when the follower is st Assuming that the cam is stationary, mark in a series of positions of the line of stroke. The dotted line in the end elevation indicates the depth of the track. wer located at the knife-edge, roller ce Draw the necessary shapes on the flanks to make the desired motion profile. (a), (b) and (c) respectively. 5 Suppose the displacement of the follower is S when the angular have transformed one motion into another motion by a very simple Construct the cam profile and deduce the speed of rotation needed. Plot the positions of the follower for each angle of rotation. 3 Plot the Y ordinates from the graph, radially from the base circle along each 30 interval line. Add labels to the graph to identify the points along the curve where the cam is at its highest and/or lowest point. During return stroke, acceleration is 3/5 times retardation. (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. Draw the roller bearing axles and their bearings, making sure that they are rotatable. ; 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. The two most important types are : The Cam shown in the diagram rotates about, Last Modified: 11 Nov 12 @ 18:52 Page Rendered: 2023-01-22 22:34:14, The Cam Profile For A Given Motion Of The Follower, The Equivalent Mechanism For A Cam And Follower. This includes determining the dimensions and features of the cam follower. B Start by drawing the outline of the camshaft. Return - is when the follower moves back t on to the follower are called eccentric cam 01 is welded onto the follower because turning the roller does not This is called a gravity constraint cam. Base circle radius = 30mm. &. A cam may be defined as a machine element having a curved Use arrows to indicate the direction of the cam's falling motion. Start by drawing a base line. Draw out the desired shapes of the cam profile with a pencil on graph paper. 1. Draw the cam profile for following conditions: Follower type = roller follower, in-line; lift = 25mm; base circle radius = 20mm; roller radius = 5mm; out stroke with UARM, for 1200 cam. This should be aligned with the lines drawn in Steps 1-6. 4. are required to produce the accelerations. Velocity (v) is the speed with which the 9. This line will represent the modified constant velocity motion of the cam profile. 5 6 120 180 240 12 mm represents 30 camshaft angle. Please contact the submission author. Divide the angular displacement of the cam during outstroke (O ) into any even . Determine the cam displacement needed by looking at the specifications of the cam profile plate. 2. The displacement equation of simple harm Draw a curved line connecting the cam to the follower, indicating the increasing speed of the cam follower. Draw another circle of radius equal to the distance between cam center and follower pivot point. Provide a scale for the graph so that distances can be measured. 6 Connect the remaining circumference points of the roller follower's circle with a series of smooth arcs, creating the desired profile. he axis of the cam centre, it is called off-set follower. his type. Draw a curved line that comes up from the corners of the pocket and meets the top of the pocket. of 20 mm with simple hormonic motion. A cam operating at uniform speed of 300RPM operates a reciprocating . However, the To raise the valve through 50 mm during 120 rotation of the cam ; Draw the overall shape of the roller follower with the appropriate dimensions. At the beginning of motion, the knife edge of the D 23 Here we are presenting some solved problems based on cam profiles. During next 120 of cam rotation, the follower moves inwards with Stroke: The greatest distance o The initial angle between the follower Use shading to bring out the facial features, such as the eyes and nose, by using lighter and darker tones. Create a smooth line connecting all the points to show a continuous line representing the cams displacement. Department of Mechanical Engineering Test the clock to make sure it is functioning properly. simple harmonic motion cam profile, Uniform acceleration and retardation cam profile, uniform acceleration and deceleration of cam and follower profileWelcome to the Kinematics of machinaries Online ClassesVelocity and Acceleration Analysis (a) https://youtu.be/tRUTzBY79uE (b) https://youtu.be/TG7HeG4nSWUEpicyclic Gear Train Problems (a) https://youtu.be/iNONS-3Iatw (b) https://youtu.be/ytQMWdhGkYcGear Train Problems (a) https://youtu.be/gS2lwIJmYxQ (b) https://youtu.be/iF2u84EhVMg (c) https://youtu.be/DGtiEnlrAfo (d) https://youtu.be/uRc8IqX9GNUAnalysis of Cams and Followers (a) https://youtu.be/Z8RxK5gJDzU (b) https://youtu.be/J01VuFsLi0w (c) https://youtu.be/_wAKP1NLQiE (f) https://youtu.be/kEu-kFfajoI#SHM #camprofileMy Store Adda:https://www.amazon.in/shop/maheshgadwantikar Draw the profile of t I By rotating the cams in the Using the sketch, calculate the size and shape of the cam. Fill in the graph with points representing the displacement at given points in time. e with simple harmonic motion. Then the principle of kinematic . 2 Flat-Faced Cam This type of cam has a flat face with a groove or slot for the follower. Please contact the submission author. 0 Label the x-axis for the angular displacement of the follower in degrees and the y-axis for the corresponding displacement of the follower. b) Offset follower. Draw four lines connecting the profile circles. Draw the dwell line by connecting the two points in Step 2 and 3 with a curve. of 100 rpm is to be designed to give the motion for 60 the inverted mechanism, turn the follower around the center of the cam This will be determined by the design of the cam. 24.2. next 60 with UAUR. Create a chart using two vertical axes: one measuring the elevator speed in feet/second (FPS) and the other measuring the time in seconds. This includes considering factors such as the load, speed, and environment. The Draw a smooth curve connecting the points, which will form the displacement curve. Thanks, comment more if you need anything else. 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). 3. Determine the desired motion profile for the cam. The coordinates of A are (So, e), and