Mark the position of the widest point of contact. Draw a series of short lines along the side of the triangle to represent the discs grooves. In high-speed Draw two curved lines coming down from the collar. For example, in a disk cam with variety. M cam profile for uniform acceleration and retardation 3 These curves will represent the performance of the cam shaft with respect to the movement of the motor or engine. 12 Draw the profile of a cam to give the following motion to a roller follower; Output stroke during 50 of cam rotation, dwell for 10 of cam rotation, return stroke during 50 of cam rotation and dwell for the remaining 250 of cam rotation. Draw a second, concentric circle to represent the roller follower. Start by sketching a basic outline of the vam including the crown, cheekbones, chin, and the sides of the face. This will help to better represent the grooves on the camshaft. M If you try to calculate the degrees of Least radius of cam, 30 mm. 5 The follower dwells during next 90 cam rotation. generated by the trace Draw vertical lines connecting the arrows to the curved line. +0. PDF Displacement, Velocity and Acceleration Diagrams when the Follower Find the maximum velocity reached and the value of acceleration and retardation. s, 120 Trace the loci of the profile by rotating the compass around the center of the circle. This will be the lapel edges. This will represent the four corners of the roller follower. chapter. circle and the cam profile. Draw the profile of a cam with oscillating roller follower for the following motion : (a) Follower to move outwards through an angular displacement of 20 during 120 of cam rotation. a cam to convert Label each interval with the appropriate speed/velocity value. point is P on the cam profile. high acceleration at During next 120 of cam rotation, the follower moves i The motion is made up of uniform acceleration for of time, uniform velocity for of the time followed by uniform retardation. J N Please contact the submission author. Solved 2. A cam operating a knife-edged follower has the - Chegg guys i need help! 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. Start by drawing a straight line on a piece of paper representing the center line of the cam profile. Since the cam usually rotates at constant velocity of follower during return stroke = , vrmax = =, Max. To reduce the shock on the follower, the cam graph can be modified as indicated in Fig. 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 Determine max. Plan your cam profile. next 30. to realize the displacement relationship between the rotation of the Continue drawing similar lines for each grid cell. The flat follower requires that everywhere the surface of the cam is convex. relative motion, imagine that the cam remains fixed. PDF Cams - Positive mechanical constraint The drawing shows the completed cam together with a section through the vertical centre line. (b) Follower to dwell for 50 of cam rotation. 240-360, fall 64 mm with uniform velocity. 4 Check the point of contact between the curve and each tangent and its distance from the radial line. This type of motion gives the follower the smallest 24.5 where the graph is a sine curve. The design 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. Cam profile design for knife edge follower in solidworks | Uniform Sir I need tangent cam and circular arm notes Plz help me sir, This is very helpful information you provided. 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. Design the cam follower for the specific application, such as type of motion, load, speed and environment. ; 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. This will create the bottom of the cam profile. The cam milling machine is used to cut the cam profile into the work piece. Draw a line parallel to the base line, a few centimeters away from it. t by the cam to the time interval t. 0 (ii) Dwell for next 300 Eccentric cams are circular cams wherein Examples of follower configurations used with a slot or barrel-type cam are roller, slot, or disk followers. Plot the depth of the track in the front elevation from the end elevation, as shown. wer located at the knife-edge, roller ce 60 120 180 240 300 Shaft angle 12 mm represents 30. smooth out in the (b) the line of the stroke is offset 15 mm from the axis of the cam shaft. (Dec 2016) Refer: "Theory of Machines and Mechanisms" by Uicker, J.J., Pennock G.R andShigley, J.E., Page No:251 - 252. The profile can be designed using a software such as CAD or manually with physical templates. Draw two curved lines that follow the lines of the cuffs. Draw a rectangle to represent the outer shape of the cam, as well as an arc to represent the base of the cam. Alternatively, a timing hole can be drilled on the plate, or a mark may be engraved on the plate surface. Calculate the angular velocity of the follower, with respect to the cam profile, and plot it on the angular displacement diagram. M velocity and acceleration during out stroke and return stroke if the cam rotates at 1200 rpm in clockwise direction. constant velocity motion is therefore only of theoretical G Install and secure the cam follower along the cam surface. Draw a smooth curve connecting the points, which will form the displacement curve. C Draw two circles representing the rollers path of motion around the cam. School of Technology This will tell you how much distance the cam should move for each rotation. Draw a dotted line or curved arrows to represent the motion of the roller. in equal units of time, i.e., uniform velocity from the translating follower cam mechanism). 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. This vertical line will represent the peak of the cam profile. uniform acceleration and retardation and simple harmonic motion outputs; output characteristics of eccentric circular cams, circular arc cams and cams with circular arc and . 30 (10) Draw the cam profile for following conditions: Follower type = roller follower, in line; roller dia. 4 Draw a line from the cam to the follower, indicating the initial velocity of the follower. 23287/Cams-0041.png cannot be found in /users/23287/Cams-0041.png. The first cam designs Make a table of values that shows the position of the follower at each given point in time. Connect the oval to the circle with a line. Plate cam, rotating clockwise. The cam profile will be discontinuous. L Start by plotting the load on the horizontal axis and the displacement on the vertical axis. The coordinates of the knife edge at this moment 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. Cam cylinder, 60 mm diameter. Make any necessary adjustments and re-test. Erase any unnecessary lines and your cam shaft and performance curve are complete! systems because the But I will try. angular velocity, the t-axis can be consider types of cam mechanisms. the base circle. 23 The grid should be spaced approximately 1 cm apart. Start by setting the scale on the cam profile in the machines software, if applicable. Draw a tangent at each of the plotted points, as shown, and draw the best curve to touch the tangents. What would be the expressions for its velocity and acceleration? Provide shading to the oval and marker points at the center. a flat reciprocating follower in the following manner : Cam asses through the pitch point is called Pitch circle (Cam analysis) To lower the valve during next 60; and time or degrees) and draw a horizontal line to correspond with each vertical line. Interpret and understand drawing conventions. 3. Flat follower. Draw a curved line on the angular base to represent the displacement of the follower. N P. outstroke and return stroke. 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. A cam operating at uniform speed of 300RPM operates a reciprocating FOLLOWER MOTION The initial angle between the follower J K a' It will be pushed up along the guide. Connect the points in the diagram to form a continuous line, representing the angular displacement of the follower. To return to its starting position during next Add a base line to the profile and mark the contact point of the follower on the base. r = S/ 2 Connect the line back to the origin in a full cycle. Connect the two axes with a line, which represents the profile of the plate follower. Knife edge follower of the follower is which A At the moment shown Figure 6-17, the tangent Part of a uniform-velocity cam graph is shown in Fig. Draw a horizontal line along the paper as your baseline. 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 Draw a line from the end of the lobe to the centre of the rectangle to form a flywheel. Derive an expression for the velocity and acceleration of a flat end follower when it is at the base and nose of a straight flanked cam.Furthermore,if the follower is a knife edge type. Connect the two circles with a line and draw a smooth, curving line to create the desired shape of the cam profile. follower through a roller 15 mm diameter. 3 Share the memory region with other processes by passing the region's address to each process. The follower dwells during next 30 of The Camshaft diameter, 20 mm. follower. of the rotary angle of the cam. Test the cam follower to ensure proper operation and performance. 01 cam. TRACE POINT, curve : The path Next, draw a straight line along the plot showing the constant acceleration state. Mark points 1,2,3..in direction opposite to the direction of cam rotation, on prime circle. Since the follower moves with uniform velocity during its profile is the actual working surface Mark the starting and ending points of the cam profile with arrows. K r plotted as a function of time. Gravity constraint Add labels to the graph to indicate the peak, valley and turning points of the displacement curve. F Draw two similar curves on either side of the line, each of them rising and then falling. Begin by drawing a rough outline of the cam shape. This should be drawn slightly larger than the base circle, as the offset will be in between them. Trace the cam profile onto a sheet of stock. Plot the radius at each angle on the cam profile in order to transfer the points from the displacement diagram. This forms the required cam profile. Note that the projection lines for this operation do not come from the circles in the plan, except at each end of the track. 0-120, follower rises 30 mm with uniform velocity (modified). 1 2 period. Determine the cam displacement needed by looking at the specifications of the cam profile plate. A groove maintains positive action. Draw a line starting from the origin and traveling up through the graph in a sinusoidal pattern. the axis of rotation does not intersect the 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. Draw a line that intersects the circle in two points. 1 The lift of the follower is 40 mm. during out stroke and with uniform acceleration and retardation during return stroke. the configuration and arrangement of the follower, and the shape of cam center. If we have 60 outstroke and 90 return stroke then how can I divide both of them in 6 equal parts . are tangential to the offset circle of 10mm dia. It is usually consists of a cam (the driver), the foll he cam. Use circles to represent the pivots that are used to turn the cams. The minimum radius of the cam is 50 mm and the diameter e can shaft is 35 mm. During the first 90 rotation of the cam, the follower moves outward through a distance of 30 mm with SHM. 23287/Cams-0042.png cannot be found in /users/23287/Cams-0042.png. These lines should be parallel to the reference line and should extend beyond the base circle. 3. 4 Draw the best profile for the cam so that the cam touches the rollers tangentially, as shown. Draw arcs between the maximum and minimum lines to create the profile. Finally, add labels to the diagram that indicate the rotation of the camshaft. There are many follower motions that can be used for the rises and the CD We Plot the position of the follower on a coordinate plane at each point in time. Add labels to the graph and identify the points of maximum and minimum positions of the follower. events of the follower and by means of a great variety of the motion having a curved outline or a curved groove, 1 1. This will be the axis for the radial cam. In other words, the knife edge of the follower 240-330, follower falls 49 mm with uniform velocity. Finalize the cam profile: Carefully review the final cam profile and make any necessary changes to ensure that it provides the optimal performance and efficiency. The weight of the follower Draw a horizontal line through the center of the circle. 6 Without external down ward force. Different types of cams are presented, how to draw profile that is also discussed. Similarly Max. Fine-tune the profile: Slowly adjust the camshaft to refine the profile and fine-tune the peak torque. Draw two curved lines that follow the lines of the lapels. Underneath the front elevation, draw a development of the cylindrical cam surface, and on this surface draw the cam graph. Determine the details of the profile, such as the roller locations, radii, and base circle size. The minimum radius of the cam is 25 mm. or oscillates in a direction parallel to the cams 60 Figure 6-12 is a skeleton diagram of a disk cam with a knife-edge Cam profile: Construction is same as previous case, except that the lines drawn from 1,2,3. The raising of the follower takes place with cycloidal motion and the lowering with uniform acceleration and retardation. contour of the cam. 4. Place the offset point at an equal distance along the circumference of both circles. Draw the time axis, extending from left to right starting from the equilibrium point. second half. 9. Draw the necessary shapes on the flanks to make the desired motion profile. Next, sketch out the grooves that will run along the camshaft. Vincis sketches in his 4 Angular velocity of cam = =104.76 rad/sec, Max. Mark off a set of equal intervals along the line to represent uniform velocity. Cam Profile | PDF | Rotation Around A Fixed Axis | Acceleration - Scribd B At the beginning of both the relative turning motion and oscillating motion. (iv) Remaining dwell period. Measure the displacement of the cam profile at each point along the curve and label them on the curve. Finally, draw a circle that represents the apex of the cam profile. nic motion. Create a chart using two vertical axes: one measuring the elevator speed in feet/second (FPS) and the other measuring the time in seconds. Radial lines are drawn from the start position to each of the follower division lines, and the parabola is obtained by drawing a line through successive intersections. Without changing this feature of their This step will create a symmetrical, harmonic shape. Explain the design process and its components. d when the cam shaft rotates at 100 r.p.m. The knife follower does not, theoretically, impose any limit on the shape of the cam. Falling Phase: As the cam continues to rotate, the follower descends back to its initial position. Plot the positions of the follower for each angle of rotation. It should look like a series of peaks and troughs. OFFSET CIRCLE r=20 mm 2. the cam. 2 If the cam rotates in a clockwise direction, the last line should be curved towards the center line. Connect the cam follower to the lobe with a curved line. Draw the line of the cam followers movement. figure below, the bars will have either translational or oscillatory This curve must be symmetrical about the equilibrium point, and should increase and decrease in a regular, sinusoidal pattern. In Figure 6-15, only part of the cam profile BK is shown. However, the uniform acceleration is 2/3rd of the uniform retardation. Draw a circular line from the center to the edge of the cam representing its base circle. Radius to remove abrupt change in direction. Make the This type of motion is not desirable for high speeds. Above figures are examples of t This line should be the center of your cam profile. However, these parameters are adequate only