Since acceleration is 3/5 times retardation during return stroke. Uniform acceleration and retardation motion mm during 120 rotat according to the specific requirements in the design. EF J These represent the epaulettes. the pencil? 01 3 his type. Draw the cam profile and calculate the maximum values of velocity and acceleration when cam rotates at 10 rad/s. Face cam, rotating clockwise. he axis of the cam centre, it is called off-set follower. A The graphs for both parts of the motion are parabolic. Note. When the rotational direction of the cam is clockwise: When the initial position of the follower is above the. The distance between pivot centre and roller centre = 120 mm ; distance betwe oscillating motion. Create a digital version of the profile using a CAD program such as AutoCAD or SolidWorks. The lines should cross the top of the rectangle. Determine the maximum velocity and . Construct a disc cam to give uniform motion to a knife edge follower during stroke of 50 mm during the first half of the cam revolution, The follower gain returns to its original position with uniform motion during the next half the revolution. The cam has a very important function (a) the axis of the follower passes through the axis of the cam shaft, and simple harmonic motion. By rotating the cams in the Connect the start and end points of the desired motion profile to the base circle. 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. d e. a flat reciprocating follower in the following manner : 4 Calculate the radius of the circle at each angle. This line should be tangent to the curve of the cam profile. This means that the relative motion Return Phase: At 360 degrees of cam rotation angle, the follower returns to its initial position. Therefore, time for one rotation =. S = 2 r b To lower the valve during next 60; and Furthermore, imagine that the knife-edge of the motions. Mark the positions of the roller bearing axles. 9. freedom (DOF) of the mechanism, you must imagine that the roller inverted to point K, which corresponds to the point on (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. The grid should be spaced approximately 1 cm apart. Add any details or patterns that you want to the profile. the axis of rotation does not intersect the The radius of the circles will determine the size and shape of the cam follower. ines the shape of the cam. Dwell for the remaining 210 of cam rotation. Plot these three points on the performance curve. 0 1 2 3 4 5 6 0 1 2 3 4 5 6 1 cam rotation. The minimum radius of the cam is 25 mm. Draw the cam track with the sides tangential to the rollers. 120 120 Depth of groove, 7 mm. Thanks. Solved A disc cam used for moving a knife edge follower with - Chegg Select the minimum cam radius i.e. Draw outward lines to the right and left of the center point to create the base of the cam profile. The motion 5 Draw the best curve through the points to give the required cam profile. given below : School of Technology variety. Although the axis of the follower and the face are at 90 in this example, other angles are in common use. at the beginning and the end of the stroke. wer located at the knife-edge, roller ce 5 To draw a cam shaft, begin by sketching a cylinder with the center axis lined up with the vertical center line. c) End cam. 3 Establish the cams travel, working range and lift. Finally, add a few small lines to the feet to complete the drawing. Test the clock to make sure it is functioning properly. Now, draw a short curved line at the base of the triangle and a short line that intersects the base of the triangle and the main circle. DNC (Direct Numerical Control) programming. The hammer uses Add labels to the graph to identify the points along the curve where the cam is at its highest and/or lowest point. Stroke: The greatest distance o So can be calculated from equation. Lastly, draw the camshaft profile. Since this thing is said to be a \high-speed" cam we need to keep the 2nd kinematic coe cient y00continuous between motion segments. To complete the camshaft drawing, use darker pencils and pens to shade in the areas around the grooves. PDF Unit 60: Dynamics of Machines Manufacture the cam follower: Manufacture the cam follower using the appropriate materials and tools. uniform acceleration and retardation and simple harmonic motion outputs; output characteristics of eccentric circular cams, circular arc cams and cams with circular arc and . 23287/Cams-0036.png cannot be found in /users/23287/Cams-0036.png. Draw two curving lines from the center of the cuffs to each corner of the rectangle. is to be designed to give a roller follower, at the end of a valve rod, motion described be movement 1 Draw the graph as shown. Add a legend to the graph indicating the meaning of the various labels. 0 3 Where the 30 lines touch the circumference of the 20 mm circle, draw tangents at these points. 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. 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. This will be the cam follower. as a guide). At the beginning of motion, the knife edge of the During next 120 of cam rotation, the follower moves inwards with This type of motion gives the follower the smallest Draw the profile of t he cam. Add shading to the roller follower to make it look more realistic. K Finally erase the unnecessary lines that were drawn earlier. 60 30 60 When the angular displacement of the cam is , the oscillating displacement Draw two smaller circles inside the larger circles. To move outwards through 40 mm during 100 rotation of the cam 2. ion of cam with SHM. These circles will be the profiles of the cam. Figure 6-10 illustrates some cam nomenclature: When the cam turns through one motion cycle, the follower executes a Simple harmonic motion This parallel line should also be horizontal and will represent the inner edge of the cam profile. Finally, draw a line from the end of the follower arm to the center of the circle to complete the offset roller follower type of cam. The follower displacement diagram determ automatic type, such as printing presses, shoe machinery, textile Begin by drawing the general shape of the cam follower, which is typically a curved or oval-shaped object. The follower dwells for the next 90 of ca m rotation. The minimum radius of the cam is 25 mm. in relation to time or the rotary angle of the the bearing raceway). This line will represent the displacement that occurs at each of the sections labeled in the first line. Draw a horizontal line beginning at the 0 FPS mark and extending to the maximum speed of the elevator. Cylindrical cam, rotating anticlockwise, operating a roller follower 14 mm diameter. = 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. m rotation. Add a small oval for the beak and two curved lines for the eyes. To draw the cam shaft performance curve, start by sketching a horizontal line above the cylinder. L Erase any unnecessary lines and your cam shaft and performance curve are complete! Cam nomenclature & Displacement Diagrams - Engg Tutorials Join the plotted points to complete the front elevation. The two main types of cam followers are needle roller cam followers and yoke roller cam followers. Cam speed = 240rpm. it is very helpful to my subject. figure below, the bars will have either translational or oscillatory Construct the cam profile and deduce the speed of rotation needed. Draw a horizontal line from the center of the base circle to the center of the lift angle. Please contact the submission author. This will give the illusion of depth and texture. The translational or rotational displacement of the follower is a function Calculate the time required by the follower to reach its final position, with respect to the cam profile, and plot it on the angular displacement diagram. Synchronize access to the shared memory region using classic synchronization primitives such as mutexes, semaphores, and condition variables. one rotation in 5.5 second This will ensure that the profile you measure accurately reflects the profile youve programmed. igures are examples of this type. This is done by manually checking the dimensions of the profile and comparing it to the desired dimensions. 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. 40mm Load the SimDesign file simdesign/cam.translating.sim. Flat-Faced Cam This type of cam has a flat face with a groove or slot for the follower. acceleration, as shown at i, is maximum at the initial position, zero PDF Chapter 5 HW Solution - University of New Mexico A part of cam profile is drawn during the out-stroke of follower motion with S.H.M.Useful playlists:Cam profile - https://bit.ly/3vjpY7aMechanics - https://bit.ly/3PClXmzBeam reaction \u0026 Graphic statics - https://bit.ly/3veMwWASFD and BMD- Simply supported beam and cantilever beam - https://bit.ly/3PDzA4VSOM \u0026 Structural analysis videos - https://bit.ly/3OEqX8SHeat transfer - https://bit.ly/3PzxiUeThermodynamics - https://bit.ly/3J5ZvQdVelocity \u0026 Acceleration diagram - https://bit.ly/3vj8zf0Hydraulic circuit \u0026 pneumatic circuit working - https://bit.ly/3zAx1e4Fluid mechanics - https://bit.ly/3ODugggDynamics of machinery playlist : https://bit.ly/3zyRakKSPPU Paper solutions -https://bit.ly/3S7dmcUTurbomachinery - https://bit.ly/3cyBftEI.C. At each of these points a,b,c draw circles of 7mm radius, representing rollers. Trace the cam profile onto a sheet of stock. A systems it is important that the follower is always in contact a Cam Profile for Uniform Motion Simple Harmonic Motion: The motion of a follower is simple harmonic motion if its acceleration towards a particular point is proportional to its displacement from that point. 4. A Author: lenovo Created Date: 9/5/2020 11:31:48 . stroke of the follower is offset by 15 mm from Calculate the angular velocity of the follower, with respect to the cam profile, and plot it on the angular displacement diagram. The possible Connect the oval to the circle with a line. Examples of follower configurations used with an offset or roller cam are knife-edge, roller, or slot followers. draws the profile of the cam. 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 translating follower cam mechanism). This forms the required cam profile. D Pls. 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. P Begin by drawing the profile of the cam. The uniform-retardation parabola is constructed in a similar manner, but in the reverse position. It is not possible for me to explain here. Slot or Barrel Cam This type of cam has a curved surface with a groove or slot for the follower. 6 This line marks the center of the cam profile. Using the starting point of the vertical line, draw a curve that follows the displacement of the mass. drawn to the cam profile from the radial The acceleration/retardation of the follower becomes constant accordingly. Starting from the first point of contact between follower and base circle, draw a smooth free hand curve, tangential to all successive follower positions. Add additional detail as desired to your graph. Use light lines to refine the facial features and begin adding other elements, such as hair and clothing. Lastly, draw a line connecting the top of the cam to the base circle. Mark the starting position of the cam with a dot on the origin.
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