Page 248 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

TASK 2 : Tool reference point and commanding point
• Turret reference point in relation to the work co-ordinate system is shown in Fig 1

• Tool reference point in relation to the turret reference point is shown in Fig 2
• X=tool length in x axis from reference point.
• Z=tool length in z axis from reference point.
• P =commanding point on tool in relation to the work coordinate system
• Measure x and z distance and enter in tool offset page, then ‘p’ will become commanding point

Measurement of tool offset differ control to control, the above if methods is sinumeric control.
• For various tool the commanding point are shown in Fig 3
• For tools such as drill and other point to point tool used in milling or turning the reference point is always the
extreme tip of the tool measured along z axis . x will always zero (Fig 4)
• Measure the tool centre distance from the machine centre in x axis and that will be x axis tool offset.
• Measure the distance from the reference point and the tool tip in z and that is tool offset in z axis
• For boring tool measure the distance from machine centre to the boring to tool tip that is x axis tool offset
• Similarly measure the length from the reference point to tool the in z direction. That is the tool offset in z direction
as shown in Fig 5

Fig 1 Fig 4

Fig 2
Fig 5

Fig 3

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CITS : C G & M - Fitter - Exercise 57 CITS : C G & M - Fitter - Exercise 57