File Name: radial cam and follower experiment .zip
Figure Simple Cam experiment Take a pencil and a book to do an experiment as shown above.
Part of a uniform-velocity cam graph is shown in Fig. 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. However, this action results in an increase in the average rate of rise or fall of the follower. 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. 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. Plate cam, rotating anticlockwise. Point follower. Least radius of cam, 30 mm. Camshaft diameter, 20 mm. Exact dimensions are used for the Y axis, where the follower lift is plotted. 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. Flat follower. Least distance from follower to cam centre, 30 mm. 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. 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. 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. Plate cam, rotating clockwise. Mark the camshaft angles in the anticlockwise direction.
Least distance from the roller centre to the camshaft centre line, 50 mm. This circle is the base circle. Face cam, rotating clockwise. Least radius of cam, 26 mm. Camshaft diameter, 30 mm. Draw a circle at each point for the roller follower. 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. Cylindrical cam, rotating anticlockwise, operating a roller follower 14 mm diameter. Cam cylinder, 60 mm diameter. Depth of groove, 7 mm. 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. 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. Joshua Nava Arts Art current. Pencil Drawing Made Easy. Responses pauli Which side should motorcycle cam followers axis vertical or horizontal?
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Yuan, L. December 7, January ; 1 : In a recent study, the authors presented a systematic method for the modification of the output motion of linkage mechanisms with closed-loop chains using cams positioned at one or more joints of the mechanism. In this paper, the method is applied to the design of a linkage mechanism with an integrated cam mechanism to eliminate high harmonic component of the output motion.
Part of a uniform-velocity cam graph is shown in Fig. 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. However, this action results in an increase in the average rate of rise or fall of the follower. 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.
To verify cam-jump phenomenon Aim: Verification Cam Jump Phenomenon Apparatus: Experimental set with eccentric cam and flat face follower, spanner, tachometer and motor drive. The cam may remain stationary, translate, oscillate or rotate whereas the follower may translate or oscillate. Cam Mechanism is a case of a higher pair with line contact. In its simplest form, a cam mechanism consists of three links with higher pairing between two links. According to the follower motion. According to the shape of the cam. According to the manner of constraint of the follower.
for a cam-follower system characterized by a radial cam and a from the actuating cam. The aim of the experiment is twofold: (i) to observe.
In mechanical engineering, engineers often use a higher pair links mechanism that is renowned as Cam and Follower Mechanism. This pair of higher links are used to move links spontaneously or periodically. Although, cam and follower mechanisms are also used by engineers for ensuring zero or minimum degree of error.
Трудно даже поверить, подумал Беккер, что после всех выпавших на его долю злоключений он вернулся туда, откуда начал поиски. Чего же он ждет. Он засмеялся.
С вами хочет поговорить начальник шифровалки. Она сейчас будет. - Она? - Беккер рассмеялся. Он не заметил в АНБ ни одного существа женского пола. - Вас это смущает? - раздался у него за спиной звонкий голос. Беккер обернулся и тотчас почувствовал, что краснеет. Он уставился на карточку с личными данными, приколотыми к блузке стоявшей перед ним женщины.
1 Introduction. A Simple Experiment: What is a Cam? This is a plate cam with the follower riding in a groove in the face of the cam.
- Он умер от разрыва сердца. Сегодня утром звонили из КОМИНТа. Их компьютер через Интерпол засек имя Танкадо в регистратуре полиции Севильи.
В этой комнате находилась Сьюзан. Она стояла отдельно от остальных и смотрела на него, смеясь и плача. - Дэвид… Слава Богу.
Так какая разница.
А потом они со Сьюзан будут лежать в кровати с балдахином в Стоун-Мэнор и наверстывать упущенное время. Девушка наконец нашла то, что искала, - газовый баллончик для самозащиты, экологически чистый аналог газа мейс, сделанный из острейшего кайенского перца и чили. Одним быстрым движением она выпрямилась, выпустила струю прямо в лицо Беккеру, после чего схватила сумку и побежала к двери. Когда она оглянулась, Дэвид Беккер лежал на полу, прижимая ладони к лицу и корчась от нестерпимого жжения в глазах.
Рядом со мной Сьюзан Флетчер. В тот момент Сьюзан поняла, за что уважает Тревора Стратмора. Все эти десять лет, в штиль и в бурю, он вел ее за .
You must have heard this Cam and follower mechanism is in Internal combustion engines.Causconsitschic 27.12.2020 at 15:30
PDF | Cam mechanisms are integral parts of many products. comprising a flat faced follower, which is pressed to the surface of a radial cam by the coil In future, the analytical results will be complemented by experiment.Ila V. 29.12.2020 at 05:19
A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion.Bobo78 31.12.2020 at 18:25
In radial cams, the follower reciprocates or translates in a direction perpendicular to the cam axis. Radial cams are very popular due to their simplicity and.