Page 95 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Turning and facing on Lathe Machine:

Selecting the appropriate cutting tool is crucial for achieving the desired results in turning operations. Different
types of cutting tools, such as carbide inserts or high-speed steel (HSS) tool bits, may be used depending on the
material being machined, the desired surface finish, and the specific requirements of the job. Once the cutting
tool is selected, it should be installed securely in the tool holder and properly aligned with the workpiece to ensure
precise and consistent cutting.
Facing Cuts:
Facing is often the first operation performed on the lathe machine and involves cutting a flat surface perpendicular
to the axis of rotation. This ensures that the end of the workpiece is flat and square, providing a clean starting
point for subsequent machining operations. Facing cuts are made by engaging the lathe feed mechanism and
advancing the cutting tool into the workpiece until the desired depth of cut is achieved. Care must be taken to
control the feed rate and cutting depth to achieve a smooth and uniform surface finish.
Turning Operations:

After facing, turning operations are performed to remove material from the outer diameter of the workpiece and
achieve the desired shape and dimensions. This is done by engaging the lathe feed mechanism and advancing
the cutting tool along the length of the workpiece, removing material in successive passes until the desired outer
diameter is reached. Its important to use the appropriate cutting speeds, feed rates, and depth of cut to optimize
cutting efficiency and tool life while maintaining accuracy and surface finish.

Milling on Milling Machine: Workpiece Setup and Tool Setup :
Before milling on the milling machine, proper setup and fixturing of the workpiece are crucial to ensure stability,
accuracy, and safety during the machining process. The workpiece is securely clamped to the milling machine
table using various types of clamps, vises, or fixtures, depending on its size, shape, and complexity. Proper
alignment and positioning of the workpiece are essential to ensure that milling operations can be performed
accurately and efficiently.

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CITS : C G & M - Fitter - Exercise 68