## Cam follower motions

1 Uniform velocity This motion is used where the follower is required to rise or fall at a constant speed, and is often referred to as straight-line motion. Part of a uniform-velocity cam graph is shown in Fig. 24.2.

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. To reduce the shock on the follower, the cam graph can be modified as indicated in Fig. 24.3 by adding radii to remove the sharp corners. However, this action results in an increase in the average rate of rise or fall of the follower.

5040302010-

5040302010-

Radius to remove abrupt change in direction

Angular displacement of cam

Radius to remove abrupt change in direction

Angular displacement of cam

2 Uniform acceleration and retardation motion is shown in Fig. 24.4. The graphs for both parts of the motion are parabolic. The construction for the parabola involves dividing the cam-displacement angle into a convenient number of parts, and the follower displacement into the same number of parts. 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. The uniform-retardation parabola is constructed in a similar manner, but in the reverse position.

100 120 140 160 180 200

3 Simple harmonic motion is shown in Fig. 24.5 where the graph is a sine curve. The construction involves drawing a semi-circle and dividing it into the same number of parts as the cam-displacement angle. The diameter of the semi-circle is equal to the rise or fall of the follower. The graph passes through successive intersections as indicated.

The application of the various motions to different combinations of cams and followers is shown by the following practical example.

30 60 90 120 150 180 Angular displacement of cam

30 60 90 120 150 180 Angular displacement of cam

Cam specification:

Plate cam, rotating anticlockwise. Point follower. Least radius of cam, 30 mm. Camshaft diameter, 20 mm.

0-90°, follower rises 20 mm with uniform velocity. 90-150°, follower rises 30 mm with simple harmonic motion.

150-210°, dwell period.

210-270°, follower falls 20 mm with uniform acceleration.

270-360°, follower falls 30 mm with uniform retardation.

50 40 30 20 10

Cam graph

Cam graph

50 40 30 20 10

120 180 240 12 mm represents 30° camshaft angle

120 180 240 12 mm represents 30° camshaft angle

1 Draw the graph as shown. Exact dimensions are used for the Y axis, where the follower lift is plotted. The X axis has been drawn to scale, where 12 mm represents 30° of shaft rotation.

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. the nearest the follower approaches to the centre of rotation.

3 Draw radial lines 30° apart from the cam centre, and number them in the reverse direction to the cam rotation.

4 Plot the Y ordinates from the cam graph along each of the radial lines in turn, measuring from the base circle. 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.

5 Draw the best curve through the points to give the required cam profile.

Note. The user will require to know where the cam program commences, and the zero can be conveniently established on the same centre line as the shaft keyway. Alternatively, a timing hole can be drilled on the plate, or a mark may be engraved on the plate surface. In cases where the cam can be fitted back to front, the direction or rotation should also be clearly marked.

Cam specification:

Plate cam, rotating anticlockwise. Flat follower. Least distance from follower to cam centre, 30 mm. Camshaft diameter, 20 mm.

0-120°, follower rises 30 mm with uniform velocity (modified).

120-210°, dwell period

220-360°, follower falls 30 mm with uniform velocity (modified).

1 Draw the cam graph as shown, and modify the curve to remove the sharp corners. Note that in practice the size of the radius frequently used here varies between one-third and the full lift of the follower for the uniform-velocity part of the graph; the actual value depends on the rate of velocity and the speed of rotation. This type of motion is not desirable for high speeds.

2 Draw the base circle as before. 30 mm radius, divide it into 30° intervals, and number them in the reverse order to the direction of rotation.

3 Plot the Y ordinates from the graph, radially from the base circle along each 30° interval line. Draw a tangent at each of the plotted points, as shown, and draw the best curve to touch the tangents. The tangents represent the face of the flat follower in each position.

4 Check the point of contact between the curve and each tangent and its distance from the radial line. Mark the position of the widest point of contact.

In the illustration given, point P appears to be the greatest distance, and hence the follower will require to be at least R in radius to keep in contact with the cam profile at this point. Note also that a flat follower can be used only where the cam profile is always convex.

Although the axis of the follower and the face are at 90° in this example, other angles are in common use.

Cam specification:

Plate cam, rotating clockwise. 20 mm diameter roller follower.

30 mm diameter camshaft. Least radius of cam, 35

0-180°, rise 64 mm with simple harmonic motion.

180-240°, dwell period.

240-360°, fall 64 mm with uniform velocity.

### 1 Draw the cam graph as shown.

2 Draw a circle (shown as RAD Q) equal to the least radius of the cam plus the radius of the roller, and divide it into 30° divisions. Mark the camshaft angles in the anticlockwise direction.

3 Along each radial line plot the Y ordinates from the graph, and at each point draw a 20 mm circle to represent the roller.

4 Draw the best profile for the cam so that the cam touches the rollers tangentially, as shown.

Camshaft angle 10 mm represents 30°

Cam specification:

Plate cam, rotating clockwise. 20 mm diameter roller follower set 20 mm to the right of the centre line for the camshaft. Least distance from the roller centre to the camshaft centre line, 50 mm. 25 mm diameter camshaft.

0-120°, follower rises 28 mm with uniform acceleration. 120-210°, follower rises 21 mm with uniform retardation.

210-240°, dwell period.

240-330°, follower falls 49 mm with uniform velocity. 330-360°, dwell period.

1 Draw the cam graph as shown.

2 Draw a 20 mm radius circle, and divide it into 30° divisions as shown.

3 Where the 30° lines touch the circumference of the 20 mm circle, draw tangents at these points.

4 Draw a circle of radius Q, as shown, from the centre of the camshaft to the centre of the roller follower. This circle is the base circle.

Camshaft angle 10 mm represents 30°
Fig. 24.9

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.

6 Draw the best profile for the cam so that the cam touches the rollers tangentially, as in the last example.

Cam specification:

Face cam, rotating clockwise. 12 mm diameter roller follower. Least radius of cam, 26 mm. Camshaft diameter, 30 mm.

0-180°, follower rises 30 mm with simple harmonic motion.

180-240°, dwell period.

240-360°, follower falls 30 mm with simple harmonic motion.

, Cam graph

Rotation

, Cam graph

 ■X- hM u?

60 120 180 240 300 Shaft angle 12 mm represents 30°

Rotation

60 120 180 240 300 Shaft angle 12 mm represents 30°

Fig. 24.10

 1 Draw the cam graph, but note that for the first part of the motion the semi-circle is divided into six parts, and that for the second part it is divided into four parts. 2 Draw a base circle 32 mm radius, and divide into 30° intervals. 3 From each of the base-circle points, plot the lengths of the Y ordinates. Draw a circle at each point for the roller follower. 4 Draw a curve on the inside and the outside, tangentially touching the rollers, for the cam track. The drawing shows the completed cam together with a section through the vertical centre line. Note that the follower runs in a track in this example. In the previous cases, a spring or some resistance is required to keep the follower in contact with the cam profile at all times. Cam specification: Cylindrical cam, rotating anticlockwise, operating a roller follower 14 mm diameter. Cam cylinder, 60 mm diameter. Depth of groove, 7 mm. 0-180°, follower moves 70 mm to the right with simple harmonic motion. 180-360°, follower moves 70 mm to the left with simple harmonic motion. 1 Set out the cylinder blank and the end elevation as shown. Divide the end elevation into 30° divisions. Underneath the front elevation, draw a development of the cylindrical cam surface, and on this surface draw the cam graph. Using the cam graph as the centre line for each position of the roller, draw 14 mm diameter circles as shown. Draw the cam track with the sides tangential to the rollers. 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. Note that the projection lines for this operation do not come from the circles in the plan, except at each end of the track. The dotted line in the end elevation indicates the depth of the track. Plot the depth of the track in the front elevation from the end elevation, as shown. Join the plotted points to complete the front elevation. 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.

+7 0

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### Responses

• nina
How to plot a cam follower?
9 years ago
• NICHOLAS
How to draw Epicycloid and Hypocycloid?
8 years ago
• UGO
How to construct cam follower with roller how to draw cam graph?
8 years ago
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How to draw enginering drawing plate cam?
8 years ago
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How do you plot uniform acceleration cam?
8 years ago
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Can be designed to move the follower with constant velocity, acceleration, or harmonic motion?
8 years ago
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8 years ago
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8 years ago
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8 years ago
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How do you determine the measurement of the rise and fall of the cam follower?
8 years ago
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8 years ago
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8 years ago
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How the cam profile changes when there is change in follower?
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3 years ago
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3 years ago
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HOW TO CONSTRUCT A SIMPLE HAMONIC RETADATION ACELERATION MOTION DISPLACEMENT GRAPH.?
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Which cam follower produce least jerk?
3 years ago
What type of motion take place in cam profile during shm?
3 years ago
• Michelle
How to draw loci for cam profile?
3 years ago
• frances
How to draw simple harmonic motion graphs for n4 draughting?
3 years ago
• Sven
What are the expected motion of the follower during its travel?
3 years ago
• marigold
How to draw 360° horizomtak line for cam problems?
3 years ago
• anna
How to construct simple harmonic motion in technical drawing?
3 years ago
• Milen
How to do grade 11 cams EGD?
3 years ago
• aman
How to draw Cam:acceleration and retardatation step by step?
3 years ago
• Toni
How to draw a cam using a graph when it falls?
3 years ago
• hagosa
How to draw a cam falling at 30mm?
3 years ago
• katharina
How to drawm cams of simple harmonic motion?
2 years ago
• beverly parrino
How to know if cam loci is clockwise or anti clockwise?
2 years ago
• fatima
How to draw cam profile for flat faced follower?
2 years ago
• ESTELLA
What is the cam falower euth diagramr?
2 years ago
• Sanni
How to take scale for cam profile?
2 years ago
• Ren
How do you change angular displacement into millimeters?
2 years ago
• danny
How to find velocity on camfollower graph?
2 years ago
• Vittorio
Where do I get the measurements of the outside circle on loci cam?
2 years ago
• johan penttinen
How to draw an offset roller follower type of a cam?
2 years ago
• ponto
Can i divide the displacement diagram into 4 parts for roller follower SHM?
2 years ago
• Luwam
How do we construct a semi circle of simple harmonic motion?
2 years ago
• gerontius
How to draw cam profile when cam rotates in clockwise direction?
2 years ago
• Markku
How to draw cam follower when cam rotating in clockwise direction with uniform speed?
2 years ago
• Mosco
How to make a cam followers of a clock?
2 years ago
• Stephan
How to change scale in cam profile?
2 years ago
• carl greenhand
How can I make suitable scale for cams profile?
2 years ago
• ILKKA
How to draw simple hormonic motion in roller type?
2 years ago
• elisa
How to draw a flat follower in engineering drawing?
2 years ago
• susanne
How to cobstruct a radial cam?
2 years ago
• aune
Why HP moves clock wise in EGD?
2 years ago
• demi-lee sinclair
Which method or instruments is used to check Cam profile?
2 years ago
• rhianna
How to draw displacment motion graph for cams?
2 years ago
• sabine maurer
How to know if cams and followers should be simple Harmonic motion?
2 years ago
• kathleen weston
What are the methods to draw cam profile?
2 years ago
• Melba
How to construte a roller follower in technical drawing?
2 years ago
• JAYDEN
How to draw the cam profile in technical drawing?
2 years ago
• Jasmine
How to draw a cam profile for a roller cam displaced 20 mm to the center line?
2 years ago
• elijah
How to do wedge edged cams EGD?
2 years ago
• gerardo
What does it mean for a cam's follower to fall with uniform acceleration and decceleration?
2 years ago
• brogan
2 years ago
• JENS
How to contruct cams profle?
2 years ago
• frank schwab
How to consturct shm in cams?
2 years ago
• stefan
How to draw cam shaft representing it groove technically?
2 years ago
• maik
What is meant cam rotate anticlockwise?
2 years ago
• casey
How to DRAW a rotating calm follower?
2 years ago
• peter
What is the difference between anticlockwise Cam and clockwise Cam in engineering drawing?
2 years ago
• Claudia
How to draw a cam displacement for a cam profile plate?
2 years ago
• mewael
How to draw a uniformal cam?
2 years ago
• Jana
What the important of drawing a cam on draughting N4?
2 years ago
• zac
How do we construct acam profile in technical drawing?
2 years ago
• christina
How construct cam combined uniform velocity,SHM,decceleration?
2 years ago
• Alberto
How to construct a cam profile with roller?
2 years ago
• jens
WHen a body is performing a simple harmonic motion its accelaration is what?
2 years ago
• annett
How to draw profiles for parallel cam?
2 years ago
• STEFAN
How to draw a parabola on a cam graph?
2 years ago
• eula
How to construct a simple cam performance curve?
2 years ago
• CONOR
How to draw the performance of a camshaft?
2 years ago
• kalevi
How to draw a cam profil?
2 years ago
• russom
How to draw a cam given the rotation and lift only?
1 year ago
• Steffen
How to draw an uneven cam?
1 year ago
• Yorda
How to plot the profile of a flat plate follower?
1 year ago
• Riitta
What difference does offset make for a flat face follower?
1 year ago
• olle
How to draw a cam follower with uniform acceleration?
1 year ago
• Simon
How to find displacement with nominal diameter and follower?
1 year ago
• sonya
How can flat faced followers be made to rotate as they rise and fall?
1 year ago
• Kibra
How can flat faces followers be made to roate to rise and fall.?
1 year ago
• filibert
What would a cam profile look like to make a follower rise and fall four times?
1 year ago
• ernest
How 2 do a cam profile step by step egd instructions?
1 year ago
• Sofia
How to determine scale of cams graph?
1 year ago
• elen iggi
How to plot cam functions?
1 year ago
• Mungo
Why is a cam follower cadmium plated?
1 year ago
• Franklin
How to consruct angular displacement diagrams for varoius cam profiles?
1 year ago
• ellie
How to draw parabolic motion in cam profile?
1 year ago
• BRIGITTE
How to make a motion graph of a cam?
1 year ago
• ilmari
What is the nominal diameter of a pear cam?
1 year ago
• Artemio
How to draw simple harmonic motion upto half the lift?
1 year ago
• gualtiero
What happens to the cam follower during the dwell?
1 year ago
• Codi
How to draw a cam profile given the displacement, motion and velocity angles?
1 year ago
• gerontius
What type of motion transfer does a cam and follower hav?
1 year ago
• leila
How to draw displacement diagram for cam with constant acceleration and retardation?
1 year ago
• Tim Winkel
How to find radial distance of cam?
1 year ago
• Tesfay Efrem
How motion does a pear cam do?
12 months ago
• Miniya
Why is the cam follower position always the same at the starting point and theending point?
11 months ago
• awet
How to cam uniform rollor motion diagram draw?
11 months ago
• calvin
What do displacement and distance have to do with cams?
11 months ago
• Aziz
How does the follower move in the dwell stage of rotation?
11 months ago
• agamennone
How toConstruct a cam profile for radial cam?
9 months ago
How to calculate the linear motion when musing cyclindrical cams?
9 months ago
• eilidh
What is the best rotation angle for a kr22 cam follower?
7 months ago
• carson
How to create an offset cam displacement diagram?
7 months ago
• leanna watt
What motoin is produced in a eccentic cam?
7 months ago
• ronald
How to draw constant velocity chart for an elevator?
6 months ago
• Gundahar
What happens if a flat follower was used on a swash plate cam?
6 months ago
• Laura
WHAT IS HARMONIC RISE ON A CAM?
6 months ago
• Tommi
How to draw a falling cam follower?
6 months ago
• AWET
What is the mesument graph for a cam that has 2.5inch nominal diameter and a 3inch follower.?
6 months ago
• Elizabeth
How to draw offset follower cam profile step by step?
4 months ago
• Lauri
What is cam explain four different type of camandfollower with illustration.?
4 months ago
• sabine
What is the difference between displacement diagram of parabolic motion and modified uniform motion?
3 months ago
• Christina Traugott
What is jerk diagram in follower motion?
2 months ago
How to construct a follower displacement diagram?
2 months ago
• Asfaha
Can acceleration and retardation occurs at 0120 in cams performance graph?
1 month ago
• carol
When the follower of the cam mechanism moves according to the law with uniform acceleration?
9 days ago