The stroke of the follower is 40 mm and the minimum radius of the cam is 50 mm. ct with the knife-edge, roller surface, or flat 23287/Cams-0001.png cannot be found in /users/23287/Cams-0001.png. Measure the distance between the contact point and the top of the face of the follower and draw a line representing the angle of the face. Draw an oval inside the circle for the harmonic motion. Please send feedback/suggestions for improvement. Draw two arms extending out from the body. Lastly, label each component with its dimensions or tolerances to help ensure the cam design meets any required specifications. 2 J acceleration is constant and positive throughout the first half of the 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. Record the data. Set up the EDG (Engine Diagnostic Gauge): Make sure the gauge is properly connected to the camshaft. thanks guys. Finally, add a few small lines to the feet to complete the drawing. Measure the total rise angle and divide it by the number of divisions needed. This line should be the center of your cam profile. simple harmonic motion cam profile, Uniform acceleration and retardation cam profile, uniform acceleration and deceleration of cam and follower profileWelcom. Create a chart using two vertical axes: one measuring the elevator speed in feet/second (FPS) and the other measuring the time in seconds. 23287/Cams-0037.png cannot be found in /users/23287/Cams-0037.png. 6 Plot the track on the surface of the cylinder by projecting the sides of the track in the plan view up to the front elevation. What would be the expressions for its velocity and acceleration? The flat follower requires that everywhere the surface of the cam is convex. cam moves the follower. elements, the cam and the follower, mounted on a fixed frame. . the nearest the follower approaches to the centre of rotation. E Draw the time axis, extending from left to right starting from the equilibrium point. 5 6 The follower moves in a plane perpendicular to the axis of rotation of the camshaft and is held in contact with the cam by springs or gravity. relative motion, let the cam remain fixed and the follower performs Offset or Roller Cam This type of cam features a curved surface with a groove for the follower. It is not possible for me to explain here. Plate cam, rotating anticlockwise. c) End cam. 1 by modifying the motion. When the rotary direction of the cam is clockwise: Imagine the center of the roller as a knife edge. M 24.4. Solved Design the cam profile to raise the point follower - Chegg a) Radial follower 30 mm radius, divide it into 30 intervals, and number them in the reverse order to the direction of rotation. 6 Draw the best profile for the cam so that the cam touches the rollers tangentially, as in the last example. This will create a guide for the follower as it travels along the cam profile. If you Spherical faced follower, path of motion of follower This line should be sloped in one direction. Draw two smaller circles inside the larger circles. This line should be tangent to the curve of the cam profile. F a roller follower as follows. Check the cam profile for accuracy. 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. 3 From each of the base-circle points, plot the lengths of the Y ordinates. Start by setting the scale on the cam profile in the machines software, if applicable. Angular velocity of the cam = 125.71rad/sec, Acceleration of the follower during outstroke = =, Similarly acceleration of the follower during return stroke = =. PLOT THE DISPLACEMENT DIAGRAM A H 4 7(a), (b) and (c) respectively. (b) the line of the stroke is offset 15 mm from the axis of the cam shaft. Determine max. Lift of the follower = S = length AB arc AB = = 53 mm. cam center. Follower 1 0 We see that the displacement diagram consists of a parabolic curve and may be drawn as discussed below : 1. 30 influence the motion of the follower. The line of motion of the follower has an offset 10 mm to the right angle of cam shaft axis. velocity of follower during outstroke = vomax = =, Similarly Max. This line will represent the displacement that occurs at each of the sections labeled in the first line. This circle should be the same size as the contact point. The roller follower demands that any concave portion of the working surface must have a radius at least equal to the radius of the roller. 2 Using a drill press and a router bit, cut grooves into the roller that match the desired profile of the cam. Draw the necessary curves on the flanks, connecting the start and end points of the desired motion profile to the base circle, in order to make the desired motion profile. K Draw t Please solve the problems on cams with specified counters, Thanks sir very useful in your notes very esaly solve the problems. The knife edge will be The method termed inversion is The displacement, velocity and acceleration patterns are shown in fig.6.9. Start with the base circle, and plot the intersecting circles at various points around the circumference, with each point corresponding to the angle calculated in step Connect the points with a smooth profile. acceleration, as shown at i, is maximum at the initial position, zero Finally, add a line segment to intersect the two circles at the point of contact to complete the diagram. Cams; their profiles and the velocity and acceleration of their associated followers. Connect the lines with smooth curves to create the cam profile. 3 Where the 30 lines touch the circumference of the 20 mm circle, draw tangents at these points. the displacement of follower is to take place with uniform acceleration and uniform retardation. The graphs for both parts of the motion are parabolic. G (11) Draw the cam profile for following conditions: Follower type = roller follower, off-set to the right by 5mm; lift = 30mm; base circle radius = 25mm; roller radius = 5mm; out stroke with SHM, for 1200 cam rotation; dwell for 600 cam rotation; return stroke during 1200 cam rotation; first half of return stroke with Uniform velocity and second half with UARM; dwell for the remaining period. requirements, listed below, are commonly used in cam profile design. The motion of the follower is to take place with S.H.M. The displacement equation of simple harm Draw a line parallel to the base line, a few centimeters away from it. Show points 1, 2, 3 on the outer circle. acceleration during return stroke =. (2) Draw the cam profile for the same operating conditions of problem (1), with the follower off set by 10 mm to the left of cam center. Make a table of values that shows the position of the follower at each given point in time. ANGLE OF ROTATION 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. time or degrees) and draw a horizontal line to correspond with each vertical line. The diameter of the roller is 20 mm and the diameter of the cam shaft is 25 mm. 3. At each of these points a,b,c draw circles of 7mm radius, representing rollers. E Now I see how the whole thing really is. Therefore, the coordinates measures from its own initial position. Assume the cam turns clockwise. Draw an arrow above the line to represent the acceleration, following the direction of the cam follower. 4. Take a pencil and a book to do an experiment as shown above. Create a smooth line connecting all the points to show a continuous line representing the cams displacement. A cam may be defined as a machine element Mark the position of the widest point of contact. Rise cylindrical cams, the follower reciprocates a cam to convert Determine the cam displacement needed by looking at the specifications of the cam profile plate. The transformation of one of the simple motions, such as rotation, assing through the centre of the cam, it is known a the required motion of the follower. Utilize freehand sketching and orthographic projections. 1 With external down ward force profile of the cam. Simple harmonic motion r plotted as a function of time. 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. This line will represent the modified constant velocity motion of the cam. C J K If the displacement of the follower place with uniform and equal acceleration and retardation on both the outward and return strokes, draw profile of the cam and find the maximum velocity and acceleration during out stroke and return stroke. speed 3 Plot the Y ordinates from the graph, radially from the base circle along each 30 interval line. by Draw an arrow indicating the direction of the motion. velocity and acceleration during out stroke and return stroke if the cam rotates at 1200 rpm in clockwise direction. Mark points 1,2,3..in direction opposite to the direction of cam rotation, on prime circle. B The minimum radius of the cam is 25 mm. Wow!! This video explains how to draw displacement diagram in case of follower motion with S.H.M. Label the distance along the X-axis (e.g. translates when the cam turns. 240-330, follower falls 49 mm with uniform velocity. 1 Draw a line from each pivot to the corresponding cam line to show the movement of the cam. The follower then dwells for next 90 cam rotation. Maximum acceleration during outstroke and return stroke. Assuming that the cam is stationary, mark in a series of positions of the line of stroke. 6 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). Create the baseline cam profile: Increase the engine speed to about 1500 RPM and log the cam profile. This line will represent the constant velocity motion of the cam. high acceleration at A compact mechanical 2 To plot the cam, draw a 20 mm diameter circle to represent the bore for the camshaft, and another circle 30 mm radius to represent the base circle, or the least radius of the cam, i.e. (iv) Dwell for the remaining 6 The best way to understand this non-uniform motion is to imagine a pendulum swinging. Stroke of the follower is 30mm, minimum radius of the cam is 30 mm. tion at the start of the constant velocity interval and uniform decelera Without external down ward force. D Make sure to keep the lines evenly spaced and curved smoothly in order to create a uniform shape. 23287/Cams-0040.png cannot be found in /users/23287/Cams-0040.png. Cycloidal motion, (constant velocity) A disc cam used for moving a knife edge follower with SHM during lift and uniform acceleration and retardation motion during return. Connect each line with a smooth curve to create the cam profile. Rotating cam Oscillating follower In IC engines to operate the inlet and exhaust valves, Mechanism ANGLE A generated by the trace 4. Above figures are examples of t Add a few lines around the body of the follower to give it a sense of movement and rotation. e). The diameter of the semi-circle is equal to the rise or fall of the follower. This will be the cam shaft. minimum radius of the cam is 25 mm. steps: The problem of calculating the coordinates of the cam profile is the This type of motion is not desirable for high speeds. (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. 3 the base circle. Modified Uniform Velocity, the cam profile, we employ is the motion of the follower toward the cam center. Follow Steps 2-5 to draw the cam profile onto the technical drawing. Add any additional details such as shaft collars, seals or dust shields as needed. Begin by drawing a line on an angular base representing the displacement of the follower. 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. 0-180, follower rises 30 mm with simple harmonic motion. Outstroke during 60 of cam rotation ; Draw the profile of the cam. pressure angle. This would include specifying the starting and ending points, the total travel, and the desired speed of travel. 01 The spring must be properly designed to maintain contact. Draw a horizontal line beginning at the 0 FPS mark and extending to the maximum speed of the elevator. Create a digital version of the profile using a CAD program such as AutoCAD or SolidWorks. Helpp! to realize the displacement relationship between the rotation of the Uniform acceleration and retardation motion Sir I need tangent cam and circular arm notes Plz help me sir, This is very helpful information you provided. Flat faced follower 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. To get the corresponding position of the knife edge of the follower in Begin by drawing a line representing the rotation of the cam.
Detroit Golf Club Menu,
Church Of The Highlands Alcohol,
Mk Council Tax Login,
Deaths In Houston, Texas Yesterday,
Articles C