Taper Turning Methods in Lathe Machine | Types of Taper Turning

Taper turning methods in lathe machine


There are four methods
1. Form tool method
2. Tailstock set over method
3. Compound rest method
4. Taper turning attachment method



Form tool method
This is one of the simplest methods to produce short taper. This method is shown in the above figure. To the required angle the form is grounded. The tool is fed perpendicular to the lathe axis, when the work piece rotates.
01 - taper turning by form tool method - taper turning
The tool cutting edge length must be greater than the taper length. Since the entire cutting edge removes the metal, it will produce a lot of vibration and hence a large force is required. It is done in slow speed.


Tailstock set over method


Generally, when the angle of taper is very small this method will be employed. The work piece be placed in the live center and live center. Now, the tailstock will be moved in a cross wise, that is perpendicular to the lathe axis by turning the set over method. This process is known as tail stock set over method.
01 - tail stock set over method - taper turning method
Hence here the job is inclined to the required angle. When the work piece rotates the tool is moved parallel to the lathe axis. So that the taper will be generated on the work piece.


Compound rest method


Generally short and steep taper will be produced will be produced using this method. In this method the work piece will be held in the chuck and it will be rotated about the lathe axis. The compound rest is swiveled to the required angle and then it will be clamped in position.
01 - compound rest method - taper turning method
The angle is determined using the formula, tan
Then by using the compound rest hand wheel the tool will be fed. Both the internal and external taper can be done using this method. The important feature is that the compound rest can be swiveled up to 45° on both sides. Only with the help of the hand the tool should be moved.


Taper turning attachment method


In this method by using bottom plate or bracket, a taper turning attachment is attached to the rear end of the bed. It has a guide bar which is usually pivoted as its center. The guide bar has the ability to swing and it can be set in any required angle. It has graduations in degrees. On either side, the guide bar can be sweivelled to a maximum angle of 10°. It has a guide block which connects to the rear end of the cross slide and it moves on the guide bar. The binder screw is removed, before connecting the cross slide, hence the cross slide is free from the cross slide screw.
01 - Taper turning attachment method - taper turning method
Usually during taper turning, the job will be held in the chucks or in the centers. To the required angle the guide bar turned.
The angle is calculated using the formula, tanα = (D-d)/2l
When the division is given in mm instead of degree, then the angular distance of the guide bar to be tilted is given by
Using the compound rest hand wheel the depth of cut will be given. At an half taper angle the guide will be set. Using this method any taper turning method can be done.
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