 Hello everyone, myself Professor Prithish Chittay working in mechanical engineering department as an assistant professor in waltz and dystop technology. In this session we will learn the taper turning methods that will be a second part. Now the students will be able to explain the different methods of taper turning operation also they can solve the problem based on the methods of taper turning operations. Now we will have the quick recap of the fourth session also we will learn the two methods of taper turning operation that is the taper turning by the swiveling the compound rest and taper turning using the taper turning attachment which is a separate attachment. Now the quick recap of the fourth session what we have learnt in the taper turning by tailstock setover where after loosening the screw which is provided in the tailstock we can slide the tailstock may be the away from the operator or may be the towards the operator by that you will have the angle for the workpiece and the tool will have the motion parallel to the axis of the rotation and by relative motion between the tool and the workpiece you will get the taper turning operation and where x is equal to l into d1 minus d2 by 2l and d1 minus d2 by 2l is tan alpha and capital L is the total length of the workpiece and x is the length of the tailstock setover. The second method where the taper turning by the form or the broadness tool this is the form tool this is the workpiece which is fixed in the the three jaw check and this is a form tool which is already having the taper angle and you will have the cross fit there will be the relative motion between the workpiece and the tool and you will have the very short taper up to 20 mm length only means these two operations that can be used for the very small amount of taper turning operation. Now after that we will move to the the main part but before that you are having very simple question what is the formula for the total taper and the taper angle just write down in your paper just go through the figure and have the answer with you now the third method the taper turning by the swiveling the compound rest as you can see in the figure this is the workpiece this is the cross slide this is the compound rest which is placed on the saddle now you can see this is the compound rest where the cutting tool is attached in the compound rest there will be the tool post and in the tool post the workpiece or maybe the tool is attached here now whenever you are loosening the bolt and the nut which is present in the compound rest so you can provide or you can swivel the compound rest through the angle alpha so that you can have the taper turning operation now how to get the angle now for example we are having the swiveling plate here below to the compound rest so by loosening the screw which is present on the the swiveling plate you can swivel this compound rest also the swiveling plate and you can mark the graduation maybe the 15 15 degree or maybe the 20 degree that you want and you can provide the taper turning operation by swiveling simultaneously the compound rest and the swiveling plate and we are also having the gradation for the angles in degrees so here and suppose i want to slide this the particular compound rest you are having the compound rest screw with the help of this just by rotating this screw you can get the the field in this direction which is parallel to the axis of the rotation now here what will be the angle for the compound rest that should be swivel and that can be achieved by that is tan alpha or maybe the taper angle that is d1 minus d2 that divided by 2l that already we are knowing that so alpha is equal to tan inverse of d1 minus d2 divided by 2l where l is the length of the job d1 and d2 are the major and minor diameter respectively we will see the simple numericals based on the the method that we have discussed a steel piece 100 mm long is tapered turn for a length of 40 mm from its one end diameter of the work piece is 20 mm and the smaller end of the tapered part end in a point find the angle through which the compound rest should be swivelled in order to turn the required taper so we are having the data d1 is equal to 20 mm d2 is equal to 0 l is equal to 100 mm and small l is equal to 40 mm so we are having the formula that is tan alpha is equal to d1 minus d2 divided by 2l so here d1 is 20 mm d2 is 0 as provided in the problem statement and capital l is equal to 100 and l is equal to 40 so with the help of this we can get the alpha is equal to 14 degrees two inches so we will move to the next problem calculate the angle of which the compounder should be swivelled in order to turn the taper with the help of following dimensions we are having the d1 is equal to one inch d2 is equal to 0.75 and l is equal to 1.5 by providing these values in the simple formula that is tan alpha is equal to d1 minus d2 divided by 2l where tan alpha is equal to 1 minus 0.75 divided by 2 into 1.5 and after that we will get alpha is equal to 4 degree so these are the very simple numerical based on the taper turning operation by the methods swivelling the compound rays and the swivelling plate so this is a very simple method for the taper turning operation by swivelling or by rotating through the angle alpha swivelling plate and the compound rays simultaneously and this is also used for the very shorter length for the taper turning operation now we will move to the next method and the last method which is called as taper turning operation with the help of taper turning attachment this is very famous method why the answer is that here there will be no limitations because the compound rest the cross slide and the saddle can be sliding on the bed wage of the lathe from one end to another end so there will not be any limitations so we can say that we can have the taper turning operation for the wider range so for example so what will be the limitations suppose you want the taper angle 16 degrees up to 16 degrees yes you can provide or suppose you want the taper turning length up to 230 or maybe the 240 length yes you can provide the taper length up to 240 mm also so this is the wider range for the taper turning for the taper turning attachment so what will be the working principle for this taper turning attachment now you can see in the figure there are the different components we will go through the different components first this is the bracket this is the main bracket here which is which consists of a graduated scale for the angle after that this is the guiding plate in the guiding plate you are having a particular slot here and in the slot as you are having this block so this slot or maybe the block B is sliding here but here first of all whenever we are providing the angle to the guiding plate by the angle alpha so this block will slide in the angle alpha and this is attached to directly to the compound rest so here the compound rest is separated from the saddle so whenever you are sliding the cross slide lever so directly the block will be sliding here so you are providing the angle alpha means you are having the particular angle to the this particular tool means you are having the taper turning operation directly so only this guiding plate is having the angle so that this block is having the also you are having the here the t-slot here or the tie lever is having which is attached to the compound rest directly and you are having the taper turning operation with the help of the taper turning attachment so you are having the very simple derivation here we know that tan alpha is equal to d1 minus d2 divided by 2L where d1 and d2 are the the major and minor diameter and L is the taper length now here what we have to calculate the requirement is that we have to calculate the required number of mm divisions to swivel the guiding plate so you can get with the help of m is equal to d1 minus d2 divided by 2L that is the tan alpha into c what is c the c is the half of the length of the guiding plate the c is the half of the length of the guiding plate so here m is equal to d1 minus d2 divided by 2L into c now we are having very simple numerical based on the taper turning attachment for the taper turning operation a job 500 mm long has to be taper turn along its length the diameters are 70 mm and 50 mm respectively we have to calculate number of mm divisions to swivel the guiding plate when the length is 1000 mm so d1 is 70 mm d2 is 50 mm we are having the length for the taper length is 500 mm and we are having the c is equal to total length that is the total length of the guiding plate that is 1000 mm divided by 2 so you can get the c is equal to 500 mm and replacing these values in the formula you can get the number of divisions in mm m is equal to 10 mm these are the references thank you