Page 249 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

CNC turning centre operation in various modes (JOG, MDI,

MPG & AUTO Mode)

Objecftives : At the end of this exercise you shall be able to
• measurement work offset values in z and x axis
• measure the tool offset values in x and z axis.

Job Sequence

TASK 1: Measurement of work offset (Fig1)

Ensure the work secured firmly in chuck
Index the tool in MDI mode with tool offset cancel and set tool offset X0,Z0, and tool type
Switch ‘ON’ spindle
Carry out slight facing of the job
After the finish cut move the tool back in X direction only

Now switch off spindle
Go to Tool off set mode
Press GEOM soft key and position the cursor using cursor movement button and select the offset number G54
Enter the Z-axis valveZ0.0

Press soft key
Now rotate the spindle in appropriate direction and machine the outside diameter (‘OD’)
Do not disturb X-axis
Take tool away in Z-direction only
Stop the spindle

Measure the outer diameter of the job using micrometer
Go to OFFSET soft key
Press GEOM soft key
Position the cursor to the required work offset number and enter the measured value. (eg: X32.62)
Press soft key

Note: The tool used for measuring work off set the tool offset is zero in X and Z direction.

Fig 1

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CITS : C G & M - Fitter - Exercise 57