Lathe Operations: Facing

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Facing Operations Facing is the process of removing metal from the end of a workpiece to produce a flat surface. Most often, the workpiece is cylindrical, but using a 4-jaw chuck you can face rectangular or odd-shaped work to form cubes and other non-cylindrical shapes.

When a lathe cutting tool removes metal it applies considerable tangential (i.e. lateral or sideways) force to the workpiece. To safely perform a facing operation the end of the workpiece must be positioned close to the jaws of the chuck. The workpiece should not extend more than 2-3 times its diameter from the chuck jaws unless a steady rest is used to support the free end. Cutting Speeds

If you read many books on machining you will find a lot of information about the correct cutting speed for the movement of the cutting tool in relation to the workpiece. You must consider the rotational speed of the workpiece and the movement of the tool relative to the workpiece. Basically, the softer the metal the faster the cutting. D…

Lathe Operations: Plain Turning

Plain Turning: Plain turning is the operation of removing excess amount of material from the surface of a cylindrical job.

Tools required for facing and plain turning are
1.Lathe
2.Three jaw chuck
3.Chuck key
4.Vernier caliper
5.Single point cutting tool

Procedure

1. First open the jaw in the chuck position the workpiece, and then tighten the jaws. Fix the cutting tool in the tool post and adjust the height of the tool.

2.Switch on the lathe and move the carriage near to the workpiece . Give it a small cross feed , and then move carriage longitudinally to the required length slowly.

3.Bring the carriage to the original position , give a small cross feed and move carriage longitudinally . Repeat this step until required diameter is obtained.

4.To get smooth surface give a very small feed when the diameter is nearing the required value.

5.To face the end surface of the workpiece, move the carriage to make the tool touch the end surface of the workpiece.

6.Give a small feef in logitudinally direction, and then move the tool towards the axis of the workpiece using the cross slide to complete the workpiece.

7.The machine is switched off.

8.The workpiece is removed from the chuck and all the dimensions are measured and checked.


Thus the required shape and size is obtained by performing turing and facing operaions

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