This type of follower can be used with a steep cam motion and does not jam. Elliptical disk cam with oscillating follower. The follower systems used on motor vehicles to control the pistons, for example, usually have a teardrop shape that causes a sharp upward motion, or displacement, as the follower reaches the apex of the teardrop, causing the attached piston to fire. Yoke Type cam followers are intended primarily for applications where loading conditions exceed the capabilities of stud type cam followers, or where clevis mounting is desired. Tighten the nut to the torque recommended by the manufacturer. So let us check it out one by one.
These were once common is mechanical and special functions in control systems. In the case of cam followers the outer race is loaded at a single point, so the outer race needs a thicker cross-section to reduce. What could be used today instead of cams? Thus the roller cam was initially carried the weight, until at the final portion of the run the profile of the non-roller cam rose more than the other causing the solid follower to take the weight. They offer high dynamic and static load carrying capability, and anti-friction performance, in a compact design. They are occasionally used in rotating machinery. This type of cam is formed on a cylinder. A common example is the of an , which takes the rotary motion of the engine and translates it into the reciprocating motion necessary to operate the intake and exhaust of the.
Crowned cam followers are used to keep the load evenly distributed if it deflects or if there is any misalignment between the follower and the followed surface. Uses Although cam and follower systems are used in a wide variety of mechanical applications, they may be most familiar to many people for their role in cars and other motor vehicles. Standard Stud cam followers offer the mounting convenience of a threaded stud and are designed to accommodate moderate loads. In clean environments, however, bearings may run a year or more before relubrication. By separating the rotating roller counterbore faces from the end plate or flange, the seal eliminates sliding metalto- metal contact.
Cam mechanisms are compact and may be easily introduced into the general scheme of a machine. Face cams may provide repetitive motion with a groove that forms a closed curve, or may provide function generation with a stopped groove. If you need to mount a stud type cam follower in a blind hole without nut and lock washer , make sure the stud fits properly in the housing. Other cam mechanisms, employed in elementary mechanical analog computers, are simple memory devices, in which the position of the cam input determines the position of the follower output or readout. A better method is to lock the stud to the housing with a pin, , or use setscrews bearing against the stud. A common example is the traditional lock, where the cam is mounted to the top of the lower sash, and the follower is the hook on the upper sash.
Like us on Facebook Send a tweet to friends Website: We request you that please do not copy our videos, otherwise, legal actions will be taken. Oil is usually applied to bearings by the splash method. Some information or method showing how to calculate 20 percent of a number are follows: In order to calculate 20 percent of number you need to follow two simple steps. The wheel creates rotational motion when the water is falling down, this wheel is directly connected to a bar, which is also connected to a cam and follower. Cam mechanisms are used in various areas of machine building, such as internal-combustion engines, metal-cutting machines, and machines of the food industry, in which the cam mechanism performs a programmed operation, as well as in automated machines, in which cam mechanisms perform control functions, connecting and disconnecting working parts at the proper moment. The cam and camshaft appeared in European mechanisms from the 14th century.
The Industrial Press, New York. The cylindrical types contain double-row cylindrical roller bearings that handle higher loads and speeds plus light thrust loads. Crowned outer rings are also available. This is the most commonly used follower, as the friction and contact stresses are lower than those for the knife-edge follower. Consult the manufacturer to obtain speed limits for specific applications. The position of the tone arm was used by some turntables as a control input, such as to turn the unit off or to load the next disk in a stack, but was ignored in simple units.
The movement is parallel to cam axis. Heavy stud cam followers are available with and without seals, and with crowned outer rings. Cams are usually made of steel, often hardened to resist wear and, for high-speed application, precisely ground. The built-in stud may be convenient, but its strength is limited by how much load that stud can support. This helps prevent corner loading of the roller and reduces thrust loads on the bearing.
The Industrial Press, New York. The cam can be a simple tooth, as is used to deliver pulses of power to a , for example, or an disc or other shape that produces a smooth reciprocating back and forth motion in the , which is a lever making contact with the cam. Image Credit: Classification of Cams Cams may be classified in many ways. Needle bearing cam followers usually have the lowest speed limit. For an eccentric stud bearing, the eccentric bushing must fit loosely in the housing bore so it can be adjusted. It is called a mushroom follower when the flat face is circular. So let us find some of the information related to cam and follower to know more about it.
One of the most common types is the needle roller, which contains long, sometimes pointed bearings; these anti-friction elements inside the cam follower allow it to move smoothly and support heavier loads. Easily adjustable for uniform load distribution on the outer ring. These were once common for special functions in control systems, such as fire control mechanisms for guns on naval vessels and mechanical analog computers. Sash window lock, traditional cam style, for double-hung sash window A variant of the face cam provides motion parallel to the axis of cam rotation. The follower shown in figure 4 b is a roller follower. They are used as track rollers, cam followers, and in a wide range of linear motion systems.
Also includes an of classic texts on mechanical design and engineering. Attaching a follower that rides in the groove gives the follower motion along the axis of rotation. Cam and track surfaces are often difficult to keep lubricated, however you should keep a coating of oil or grease on these surfaces to prevent excessive wear. Caged Roller Followers Caged roller followers provide large internal grease storage capacity for applications where relubrication is infrequent. A follower with a pointed head will more accurately hold and replicate the motion of the cam, but it is also more likely to wear down more quickly and require replacement.