 my self-professor Preeti Shtikte working as an assistant professor in mechanical engineering department in waltz and stock technology solopour. In our second session, we will learn what are the different lathe accessories that can be used for the machine. These are the learning outcomes. In this session, the students will be able to explain the working principle of lathe machine. Also they will be able to describe the different components or the parts of the lathe machine. Also they will be able to explain the different lathe accessories. So, what we are learning in the first session? First, we will see what we have learned in the first session. After that we will see the different lathe accessories. In the first session, we have seen the working principle of the lathe machine which consists of the cutting tool which is posted in the tool holding devices that is tool post. The mainly it consists of the work piece that is cylindrical work piece which is supported in the job holding devices. The job holding devices is in the rotating position and the tool is moving along the axis of the rotation means the tool is having the parallel action with the axis of the rotation. In this case, you will find the cylindrical surfaces. But in the second case, if suppose the tool is moving in the perpendicular direction to the axis of the rotation, then you will find the flat surfaces. So, this is the principle of the lathe machine and the lathe machine mainly used for metal cutting operation. So, this is a one schematic diagram of the lathe machine which consists of all the components. Now what are the different main parts of the lathe machine? Headstock, bed which is a base for the lathe machine which also consists of a bed wage here. This is a maybe a type of check. The type of check we are discussing in detail in the lathe accessories. The spindle is present inside the headstock. Now this is a carriage which consists of a saddle, compound rest, the cross slide and the tool post means. The carriage is the assembly of the four components. And suppose you want to slide the carriage, yes you can use the hand wheel. This is the tailstock. The tailstock is also consists of the hand wheel. Suppose you want to take this dead center nearer to the workpiece, yes you can rotate the hand wheel. And suppose you want to move this whole assembly of the tailstock, yes you can use this bed wage, yes you can slide. All the operations in the lathe machines are manual. These are the conventional machines. So the headstock consists of the different components like the steppkin pulley, the eccentric shaft, the back gates, yes there is a back gate mechanism that we have discussed in the first session. The main function of headstock is to get reduction in the spindle speed whenever we are required for the different cutting operations. For example, suppose we are using the turning operation or maybe the facing operation, yes there will be the high spindle speed. But if suppose you are dealing with the threading operation, parting of operation or maybe the knurling operation, yes you must use the reduction in the spindle speed if we compare to the cutting operations like the turning operation or maybe the facing operation and which is only possible with the help of headstock, mainly back gate mechanism. Here suppose you want to provide the angle to the, this tool post, yes there is a swiveling plate with the help of which you can give the angle to the tool post. There is a live center which is present to the headstock, a headstock is always a steady, a fixed part and the tailstock that can be slided in the bed base. Just go through the, this particular question which is the most important component in the lathe machine, just think about this. Now after the question, now we will move towards our second session's main concept that is lathe accessories which is a very main important part. Lathe accessories means suppose you want to hold the job directly by supporting between the centers, most of the times it is not possible, yes we can support the job between the centers but there are the different lathe accessories like a jerk or the face plate or the angle plate or the driving plate, lathe carriers. So for the different operation we have to use the different lathe accessories. Now you can see the main lathe accessories, the chuck, we are discussing the types of chuck, face plate and angle plate can be combined, driving plate and lathe carriers that is also called lathe dogs, these can be combined and that can be used for the particular applications that the different types of lathe centers, mandrels and the last one will be the steroidist and follower list. Now chuck, chuck is a job holding devices which is fixed in the headstock and behind the chuck there will be the spindle. Now this is a three jaw chuck, this is a four jaw chuck and this is a magnetic chuck. Now three jaw chuck is a universal chuck because whenever you are taking the jaws away from the workpiece or maybe the two words the workpiece, so you are fixing the key inside this hole and you are rotating that key and you can take away these jaws or maybe the take inside the job so that you can hold the job properly. But these three jaws are moving radially at same distance, that's why it is called as three jaw universal chuck. But if we compare the three jaw chuck and the four jaw chuck, the four jaw chuck is a independent chuck means each and every jaw is moving radially at different distance. Because you are having a different job rather than the cylindrical job, a different shape, size and shape than the cylindrical shape. Yes you can fix this particular job inside the four jaw independent chuck because the jaws can be sliding radially at unequal distance. Now the function of the chuck is to hold the job steady and sturdy at firm because the chuck is rotating and we are fixing the jaw with the help of here the key and the job is inside the chuck and it is rotating and we are providing the cutting action with the help of cutting tool. The jaws should be fixed to the workpiece. Now the magnetic chuck which is different than these three jaw chuck and the four jaw chuck. Here you can see the lever, this is the magnet and suppose you want to provide these types of magnets are used for the a grinding machine and suppose you want to keep the workpiece here maybe the cylindrical type of workpieces and suppose the grinder is here and you want to provide the grinding operation on the face after keeping the job in on this surface just we are rising this lever so that it can be fixed to the this magnetic chuck. So we can provide the grinding operation to the workpieces faceplate. The faceplate can be fixed to the headstock and the faceplate and the angle plate can be combiningly used to hold the different types of cylindrical workpieces. The clamping plate, the balance weight, the packing and the here the workpiece can be hold here these three components are the used to hold the workpiece in the steady position. The driving plate and the lathe carrier can be used combiningly the boss is behind this portion that is a driving plate this is the pin or the hole where your lathe carrier is inserted and whenever it is inserted in this hole so this is the straight lathe carrier this is the bent lathe carrier so this is going inside this hole and whenever you want to insert the workpiece it is going inside this workpiece and you have to fix this screw these are the references thank you