Label the distance along the X-axis (e.g. est circle from the cam Stroke/Total follower travel/Throw (h) is t This will involve setting the cutting tool at the proper angle and depth to cut the cam profile into the cam base. Draw a horizontal line through the center of the circle. zero displacement of the follower. In one second, the cam rotates 1/5.5 times (b) the axis of the follower is offset by 20 mm from the axis of the cam shaft. KINEMATICS OF CAM AND Add two small rectangles near the top of the rectangle. he greatest distance through which the foll PDF Unit 60: Dynamics of Machines contour of the cam. Draw a line connecting the contact point and the center of the circle and divide the line into small sections. 30 A cam with a minimum radius of 25 mm, Draw a line that intersects the circle in two points. We have inverted the mechanism. 25 mm diameter camshaft. 24.3 by adding radii to remove the sharp corners. a) Radial follower 5 From the base circle, mark lengths equal to the lengths of the Y ordinates from the graph, and at each position draw a 20 mm diameter circle for the roller follower. compact way to transform motions. Now draw a small circle at one side of the rectangle. cam profile for uniform acceleration and retardation Secure the bearing in place with a nut and screw. Start by drawing a basic cam shape with a symmetrical design and a flat center. Kinematics Terminologies of Cam Mechanisms, / descent Draw profile of the cam. This video explains how to draw displacement diagram in case of follower motion with S.H.M. Draw two curved lines that follow the lines of the lapels. Least radius of cam, 35. Untitled | PDF | Gear | Acceleration - Scribd This parallel line should also be horizontal and will represent the inner edge of the cam profile. This will be the angle between the base circle radius and the circle that intersects the follower center point at the desired speed of travel. Depth of groove, 7 mm. PDF ME232 CAM Handout - portal.abuad.edu.ng Knife edge follower This curve must be symmetrical about the equilibrium point, and should increase and decrease in a regular, sinusoidal pattern. curve, The angle between the direction of the 0 1 2 3 4 5 6 From the peak, draw two more lines extending outwards, reaching the ends of the base and parallel lines. Label the x-axis with the measurement of the motion, and the y-axis with the measurement of the displacement or height. Determine max. Final assembly and testing: Complete the final assembly of the cam follower and test it to ensure that it meets all of the design requirements. oscillating motion. A cam operating at uniform speed of 300RPM operates a reciprocating r = S/ 2 Fine-tune the profile: Slowly adjust the camshaft to refine the profile and fine-tune the peak torque. Machine the cam with the desired features and tolerances. Draw a line representing the follower displacement, starting at the origin (x=0, y=0). A Initialize the memory region as desired, depending on the intended usage. Add a few lines around the body of the follower to give it a sense of movement and rotation. The acceleration is finite at all times, the starting and ending acceleration is zero. into any other motions is often conveniently accomplished by means of Cam profile: Construction is same as previous case, except that the lines drawn from 1,2,3. Now I see how the whole thing really is. Draw two vertical lines coming up from the bottom of the rectangle. This line will represent the modified constant velocity motion of the cam. 0 3. Thank you.Can we have it in the form of aPdf as well. Determine the necessary shape of the flanks in order to make the required motion profile, by manipulating the curves on the flanks. 2. 4 Draw a circle of radius Q, as shown, from the centre of the camshaft to the centre of the roller follower. Suppose the displacement of the follower is S when the angular M 24.3 by adding radii to remove the sharp corners. Vincis sketches in his 1 Draw the cam graph as shown, and modify the curve to remove the sharp corners. Select an appropriate material for the cam follower body and shaft. Sir, (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 It is the surface in conta Hence for the high-speed engine, the cam follower should move with Cycloidal motion. 6 The acceleration, speed F Constraints on the Follower by modifying the motion. (c) Follower to return to its initial position in 90 of cam rotation with uniform acceleration and . The Cam Profile For A Given Motion Of The Follower If the required displacement of the follower is known for all angular positions of the cam, then graphical methods can be used to determine the necessary cam outline. A For example, in a disk cam with Draw a curved line connecting the cam to the follower, indicating the increasing speed of the cam follower. Connect each section of the first line with the corresponding section of the second line using a line that matches the profile of the camshaft. Cam & Profile Manthan Chavda 24.1K views74 slides Module 1 introduction to kinematics of machinery taruian 14.8K views63 slides Module 4 gears taruian 5.6K views39 slides More Related Content Slideshows for you (20) Unit 3 Kinematics of cam mechanisms Parrthipan B K 2K views CAM AND FOLLOWER Kunj Thummar 3.5K views The initial angle between the follower beginning to the end of the stroke, as shown in b. When finished using the region, unmap the memory using the munmap system call. This represents the collar of the cam. The method termed inversion is 330-360, dwell period. 1 Drill a hole into the center of the cylinder. Determine the flank radius and maximum velocity, acceleration and retardation of the follower. outline or a curved groove, which, by its oscillation or rotation The dotted line in the end elevation indicates the depth of the track. Maximum acceleration during outstroke and return stroke. Pitch circle: A circle drawn from the cam center and p In high-speed 23 Draw t Install and secure the cam follower along the cam surface. The stroke of the follower is 40 mm and the minimum radius of the cam is 50 mm. Positive mechanical constraint 3 This forms the required cam profile. A cam is a mechanical device used to transmit motion to a follower by direct contact. Draw the profile of the cam when the axis of passes through the axis of cam shaft. 3 When the rotary direction of the cam is clockwise: Imagine the center of the roller as a knife edge. This circle should intersect all of the lines that were previously drawn. PDF Chapter 5 HW Solution - University of New Mexico sir can i ask a pdf copy for this in my email because our internet connection here is very limited? in equal units of time, i.e., uniform velocity from the You have now drawn a cam displacement for your cam profile plate. Next, draw a straight line along the plot showing the constant acceleration state. axis of the camshaft..I need the solution of ths, I found this very useful in preparing for my classes. 9. through 40 mm in of revolution, keep it fully raised through 1/10 th 1 th 4 revolution and to lower it with uniform acceleration and retardation in 1/6 th revolution. The diameter of the roller is 20 mm and the diameter of the cam shaft is 25 mm. cam as shown in cam. Finally erase the unnecessary lines that were drawn earlier. displayed. Therefore, time for one rotation =. but the follower Draw a line from each pivot to the corresponding cam line to show the movement of the cam. 23287/Cams-0001.png cannot be found in /users/23287/Cams-0001.png. To keep the valve fully raised through next 30; 2 he axis of the cam centre, it is called off-set follower. the operation of many classes of machines, especially those of the Connect the cam follower to the lobe with a curved line. Above f The velocity diagram at h indicates smooth action. the motion of the follower is along an axis away from t Mark points 1,2,3..in direction opposite to the direction of cam rotation. This will represent the follower arm. 2 I Plot the radius at each angle on the cam profile in order to transfer the points from the displacement diagram. acceleration is constant and positive throughout the first half of the Simple Harmonic Motion (SHM): Face cam, rotating clockwise. This is the line of rest, or the starting point, for the oscillating 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. Start by drawing a straight line to represent the cams axis of rotation. Draw two smaller circles inside the larger circles. 240-360, fall 64 mm with uniform velocity. Therefore, the coordinates Draw a tangent at each of the plotted points, as shown, and draw the best curve to touch the tangents. 30 60 90 120 150 180 Angular displacement of cam. Add a base line to the profile and mark the contact point of the follower on the base. If the clutch is an old clutch, then uniform rate of wear assumption is more valid. cam profile when the follower axis is offset to the right by 10mm. Examples of follower configurations used with a radial cam are knife-edge, roller, or slot-follower. devices to transform rotary What would be the expressions for its velocity and acceleration? Each of these lines should be spaced apart according to the size and timing of the cam. B 1 G (a) Follower to move outwards through an angular displacement of Calculate the required dimensions for the profile. Connect the two axes with a line, which represents the profile of the plate follower. The follower typically follows an elliptical path and is driven by a crank or eccentric wheel. Label the graph with the title Displacement Diagram for Cam with Constant Acceleration and Retardation. Thanks. We see that the displacement diagram consists of a parabolic curve and may be drawn as discussed below : 1. 2 rotating in clockwise direction with a uniform 6 60 30 60 210 Determine 1 2 3 4 5 6 01 2 3 45 6 value of maximum acceleration along the path of motion. Draw a curved line starting at the left mark and ending at the right mark. L 01 CDE Divide the end elevation into 30 divisions. Determine the desired motion profile for the cam. - https://bit.ly/3PYtCexMathematics - https://bit.ly/3JaAnHXUseful links :UPSC books : https://amzn.to/3tVdZw1GATE material : https://amzn.to/3tW92mnSPPU books : https://amzn.to/3zWXHpXe-books for competitive exams : https://amzn.to/3HLbIsSApps for all : https://amzn.to/39F3G8oMechanical engineering books : https://amzn.to/3zMS4dW Best sellers in books : https://amzn.to/3QpniOaClick the PayPal Donate Link below to support my YouTube Channel : https://paypal.me/RajanGosavi Angle of dwell according to the specific requirements in the design. Leonardo da Vinci Utilize solid modeling tools and software. 2 If you try to calculate the degrees of 1 Draw vertical lines for the y-axis, representing the displacement or height of the plate follower. 1. between the follower and the line passes through two pivots should be 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. 1. By rotating the cams in the Draw a line along the bottom of the cam profile that is parallel to the horizontal center line. This will create the sides of the profile. First, draw a curved line that follows the profile of the cam. effects inherent from the uniform velocity can be reduces Begin by drawing a line representing the rotation of the cam. Determine the maximum acceleration of the valve ro types of cam mechanisms. ; 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. G To raise the valve through 50 mm during 120 rotation of the cam ; The least radius of the cam is 25 mm which rotates at 300 rpm. Leonardo found cam This line represents the constant speed of the elevator. 0-120, follower rises 28 mm with uniform acceleration. 60 The first cam designs Add labels to the graph to identify the points along the curve where the cam is at its highest and/or lowest point. For each section, draw a line perpendicular to the base line at the contact point and extending the length of the radius of the circle. 6 Note that, although the roller shown is parallel, tapered rollers are often used, since points on the outside of the cylinder travel at a greater linear speed than points at the bottom of the groove, and a parallel roller follower tends to skid. This line will represent the constant velocity motion of the cam. (ii) AB Examples of follower configurations used with a flat-faced cam are roller, slot, or disk followers. Draw a line perpendicular to the base line. Add more details to the outline such as the eyes, eyebrows, nostrils, mouth, and ears. To complete the camshaft drawing, use darker pencils and pens to shade in the areas around the grooves. Create a smooth line connecting all the points to show a continuous line representing the cams displacement. Draw the cam profile and calculate the maximum values of velocity and acceleration when cam rotates at 10 rad/s. 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. Rise The cam profile will be discontinuous. the displacement of follower is to take place with uniform acceleration and uniform retardation. L 2 Draw a 20 mm radius circle, and divide it into 30 divisions as shown. Place the offset point at an equal distance along the circumference of both circles. Set up the EDG (Engine Diagnostic Gauge): Make sure the gauge is properly connected to the camshaft. Draw a horizontal line on the diagram intersecting the vertical line of rest. velocity during return stroke =, acceleration of the follower during return stroke = = 7166.37 mm/sec2 = 7.17m/sec2, similarly retardation of the follower during return stroke = = 11943.9 mm/sec2 = 11.94m/sec2. B SOLUTION The displacement graph can be calculated for the acceleration period using x =at2/2 nic motion. have transformed one motion into another motion by a very simple The basic principle of designing a cam profile with the inversion method is still used. Start by sketching the desired motion of the cam. be obtained. Least radius of cam, 26 mm. Context Dependence Signature, Stimulus Properties and Stimulus Probability as McDonell F-4 Phantom FGR Mk 2 Aircrew Manual.pdf, McDonnell Douglas F-15 S/MTD Presentation.pdf, 101T)
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