Acessórios com suas funções usados para torno mecânico

Accessories with their functions used for lathe

Accessories with their functions used for lathe

Lathe attachments are used to hold and support the work or to hold the cut. The various accessories of the lathe are discussed below

A general purpose machine tool is basically composed of electrical drive and kinematic system for the essential formative and auxiliary tool – working movements and a rigid body or structure to accommodate all of the above. But various additional elements or devices called accessories are also essentially required for the overall functioning of these machines, mainly to properly hold and support the workpiece and cutting tool depending on the type and size of the tool – job and machining requirements.

Before reading this you must know Basic information about lathe and lathe specifications.

These accessories generally include, for example, in the case of;

• Central lathes: chucks, collets, faceplate, fixed supports and followers, centers, tool holders, etc.

See also: 25 Operation carried out on a lathe.

1. Centers.

a) There are two types of centers, i.e., living center and dead center.

b) A center that fits into the headstock spindle and rotates with the workpiece is called a live center.

c) The center that is used in a tailstock spindle and does not rotate is called dead center.

Living and Dead Centers Living and Dead Centers

2. Chucks.

a) It is an important device used to hold and rotate the part on lathes.

b) Workpieces that are too short to be clamped between centers are clamped in a chuck.

c) It is attached to the lathe spindle by means of two screws with the back plate screwed onto the end of the spindle.

d) There are many types of chuck, but the following two are commonly used.

i) Universal three-jaw chuck.

The three-jaw universal chuck as shown in Fig. is also called self-centering chuck or scroll chuck. Thus, the chuck is used to hold round and hexagonal work.

3 Jaw Chuck Lathe Accessories 3 Jaw Chuck Lathe Accessories

ii) Independent four-jaw chuck.

4 Jaw Chuck Lathe Accessories 4 Jaw Chuck Lathe Accessories

1. The independent four-jaw chuck, as shown in Fig., has four reversible jaws, each of which can be independently adjusted to accommodate the work it supports.

2. This type of chuck can hold square, round and irregular working shapes in a concentric or eccentric position.

The other types of chucks are

iii) combined chucks, iv) magnetic chuck, v) pickup chuck, vi) drill chuck and vii) pneumatic or hydraulic chuck

3. Lathe or conveyor

a) The work placed on a mandrel or clamped between centers is positively rotated, holding the dog or conveyor until the end of the work.

b) This is engaged with a pin attached to the drive plate or faceplate.

c) The clamp or conveyor of the lathe can be straight type or bent type, as shown in Fig.

lathe dog holder Lathe accessories lathe dog holder Lathe accessories

4. Drive plate

a) The drive plate, as shown in Fig., is a circular plate that is drilled and threaded so that it can be fixed to the spindle tip.

lathe accessory drive plate lathe accessory drive plate

b) It also has a hole for the pin that is only used when the work is carried out on a lathe with a straight tail. When a dog with a bent tail is used, this pin is removed and the bent part of the tail is inserted into the hole

5) Front plate.

lathe accessories faceplate lathe accessories faceplate

a) The front plate, as shown in Fig., is similar to the drive plate, except for the larger diameter.

b) Contains more open slots or T-slots so that screws can be used to secure the part to the face of the board.

c) The faceplate is used to hold workpieces that cannot be clamped conveniently in a chuck.

6. Angle plate.

a) An angle plate is simply a cast iron plate with flat faces perpendicular to each other and with slots in various positions for fastening screws.
chunk. is always used with the faceplate to hold parts that cannot be clamped against the vertical surface of the faceplate.

7. Chucks.

Lathe chucks Lathe chucks

a) The lathe chuck is a cylindrical bar with a central hole at each end. It is used to hold hollow parts to machine their outer surface.

b) The work rotates with the chuck that is mounted between the centers of the lathe. The various types of chucks used for different classes of work are shown in Fig.

8. Stable, follower and other rests

Long parts often need to be supported in the middle, as cutting tools can push (bend) the part away from where the centers can support them, because cutting the metal produces tremendous forces that tend to vibrate or even bend the part . This extra support can be provided by teady rest (also called steady, steady rest, center rest, or sometimes confusingly, center rest) . It is stationary from a rigid base mount and supports the workpiece in the center of the rest, typically with three contact points 120° apart.

a constant rest a constant rest

A follower rest (also called a traveling follower or constant) is similar, but is mounted on the carriage rather than the base, which means that as the tool bit moves, the follower rest “follows” (because both are rigidly connected to the same moving car)

Check out:Lathe Machine Introduction – Types of Lathe Machine, Lathe Machine Parts

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