A cam rotating clockwise at a uniform speed of 120 rpm
A cam rotating clockwise at a uniform speed of 120 rpm. is required to give motion to knife follower as below:
(a) Follower to move outwards through 40 mm during 120° of cam rotation with simple harmonic motion,
(b) Follower to dwell for the next 60° of cam rotation,
(c) Follower to return to its starting position during next 90° of cam rotation with
uniformly accelerated motion, and
(d) Follower to dwell for the rest of the cam rotation.
The minimum diameter of the cam is 50 mm and the line of stroke of the follower offsets with 10 mm the axis of the cam shaft. Find the maximum velocity and acceleration during outstroke and return stroke then draw the velocity and acceleration diagrams.
Homework Answers
By using suitable formulae for SHM path and constant accleleration path, maximum velocity and acceleration can be calculated.
A cam with a knife-edge follower has a motion with the following characteristics:
A cam with a knife-edge follower has a motion with the following characteristics: lift = 50 mm base circle radius = 25 mm outstroke = 110 degrees cam rotation with cycloidal motion first dwell = 80 degrees return stroke = 90 degrees with simple harmonic motion Cam rotates at 550 rpm in CCW direction Determine the maximum velocity and acceleration of the follower during outstroke and return stroke.
2. (8 points) A cam with a knife-edge follower has a motion with the following characteristics:...
2. (8 points) A cam with a knife-edge follower has a motion with the following characteristics: lift = 50 mm base circle radius = 25 mm outstroke = 110 degrees cam rotation with cycloidal motion first dwell = 80 degrees return stroke = 90 degrees with simple harmonic motion Cam rotates at 550 rpm in CCW direction Determine the maximum velocity and acceleration of the follower during outstroke and return stroke.
A disc cam is to be designed for a knife edge follower with the following...
A disc cam is to be designed for a knife edge follower with the following data :Cam lift = 60 mm during 120° of cam rotation with simple harmonic motion. Dwell for the next 30°.During the next 90° of cam rotation, the follower returns to its original position with simple harmonic motion.Dwell during the remaining 120°.Draw the profile of the cam when the line of stroke of the follower passes through the axis of the cam shaft. The radius of...
Please be sure that the SCALE is 1:1 . CAM DESIGN lower type. Knife-edged follower •...
Please be sure that the SCALE is 1:1
. CAM DESIGN lower type. Knife-edged follower • Lift = 26 mm • Base circle radius = 28 mm Outstroke: Cycloidal motion for 120° cam rotation Dwell for 750 • Return stroke: Simple harmonic motion for 100° cam rotation • Dwell for the remaining 650 Cam rotates at 600 rpm in CW direction Cam shaft diameter: 18 mm • Cam thickness: 4+1 mm Draw the Displacement-Time (O) diagram. Use 1:1 scale. Draw...
CAM PROFILE WITH KNIFE EDGE FOLLOWER
A disc cam is to give SHM (Simple Harmonic Motion) to a knife-edge
follower during outstroke of 50mm. The angle ascent is 120, dwell 60, and
angle of descent 90°. The minimum radius of the cam is 50mm. Draw the profile
of the cam when the axis of the follower passes through the axis of the
camshaft.
Calculate the maximum velocity and acceleration during ascent and descent
when the camshaft revolves at 240 rpm.
A translating cam-follower is to be designed for a Rise-Dwell-Fall-Dwell (RDFD) application in which vibrations must be considered
A translating cam-follower is to be designed for a Rise-Dwell-Fall-Dwell (RDFD) application in which vibrations must be considered. The cam is to move the follower from 0 to 35 mm in 70°, dwell for 100, fall back to 0 mm in 80°, and dwell for the remainder of the cycle. In addition, the cam must rotate at an angular velocity of 60 RPM. The position (s), velocity (v), and acceleration (a) curves during the rise period are defined by the...
Consider a cam with a roller follower. The cam displacement curve is in the given order:...
Consider a cam with a roller follower. The cam displacement curve is in the given order: i. for 45 degrees, a sinusoidal rise of 1 in ii. for 75 degrees, a dwell iii. for 60 degrees, a cycloidal return of 1 in iv. for 180 degrees, a dwell During the motion, the velocity is continuous but not necessarily the acceleration. a) Assume a constant cam speed of 1200 rpm. Find the maximum magnitude of the velocity (in inch/s) and acceleration...
Calculate angle and lift for each segment. A plate cam with a reciprocating follower is to...
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A plate cam with a reciprocating follower is to rotate clockwise at 400 rev/min. The follower is to dwell for 60° of cam rotation, after which it is to rise to a lift of 2.5 in. During 1 in of the return motion, it must have a constant velocity of -40 in/s. Recommend standard cam motions from Sec. 6.7 to be used for high-speed operation, and determine the corresponding lifts and cam rotation...
1. (40 points) A double-dwell cam is to move a follower from 0 to 2" in 120°, dwell for 80°, fall in 90 and dwell for the remainder. The total cycle is 5 seconds. Using cycloidal motion for t...
1. (40 points) A double-dwell cam is to move a follower from 0 to 2" in 120°, dwell for 80°, fall in 90 and dwell for the remainder. The total cycle is 5 seconds. Using cycloidal motion for the rise and 3-4-5 polynomial motion for the fall, find the follower displacement corresponding to the cam angle 0 at 90°, 180°, 230° and 320 respectively. Also find the maximum actual acceleration (in inch/sec2) during the entire motion cycle.
1. (40 points)...
10 Marks Question Five A cam drives a flat-faced follower. It is designed for.a zero lift from 0 to 70 degrees and f...
10 Marks Question Five A cam drives a flat-faced follower. It is designed for.a zero lift from 0 to 70 degrees and for a harmonic in the rise from 70 to 150 degrees. It then dwells at 40 mm lift for cam angles from 150 deg to 250 deg. Followed by a return with a uniform-motion follower displacement from 250 to 360 degrees. If the cam angular velocity is constant ot 1000 rpm, determine 40.0 70 100 150 200 250...
2. (8 points) A cam with a knife-edge follower has a motion with the following characteristics: lift = 50 mm base circle radius = 25 mm outstroke = 110 degrees cam rotation with cycloidal motion first dwell = 80 degrees return stroke = 90 degrees with simple harmonic motion Cam rotates at 550 rpm in CCW direction Determine the maximum velocity and acceleration of the follower during outstroke and return stroke.
Please be sure that the SCALE is 1:1
. CAM DESIGN lower type. Knife-edged follower • Lift = 26 mm • Base circle radius = 28 mm Outstroke: Cycloidal motion for 120° cam rotation Dwell for 750 • Return stroke: Simple harmonic motion for 100° cam rotation • Dwell for the remaining 650 Cam rotates at 600 rpm in CW direction Cam shaft diameter: 18 mm • Cam thickness: 4+1 mm Draw the Displacement-Time (O) diagram. Use 1:1 scale. Draw...
Consider a cam with a roller follower. The cam displacement curve is in the given order: i. for 45 degrees, a sinusoidal rise of 1 in ii. for 75 degrees, a dwell iii. for 60 degrees, a cycloidal return of 1 in iv. for 180 degrees, a dwell During the motion, the velocity is continuous but not necessarily the acceleration. a) Assume a constant cam speed of 1200 rpm. Find the maximum magnitude of the velocity (in inch/s) and acceleration...
Calculate angle and lift for each segment.
A plate cam with a reciprocating follower is to rotate clockwise at 400 rev/min. The follower is to dwell for 60° of cam rotation, after which it is to rise to a lift of 2.5 in. During 1 in of the return motion, it must have a constant velocity of -40 in/s. Recommend standard cam motions from Sec. 6.7 to be used for high-speed operation, and determine the corresponding lifts and cam rotation...
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1. (40 points)...
10 Marks Question Five A cam drives a flat-faced follower. It is designed for.a zero lift from 0 to 70 degrees and for a harmonic in the rise from 70 to 150 degrees. It then dwells at 40 mm lift for cam angles from 150 deg to 250 deg. Followed by a return with a uniform-motion follower displacement from 250 to 360 degrees. If the cam angular velocity is constant ot 1000 rpm, determine 40.0 70 100 150 200 250...
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