Sandvik Coromant Silent tools - application guide - Manual (Page 94)

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6. Formulas and Definitions
3-pass method
Method for achieving high accuracy in internal turning with slender
boring bars where the deflection of the bar affects the obtained
diameter.
1. Enter the desired finished diameter: 40.000
2. Measure the diameter before the first pass: 37.000
3. Run the first pass. The programmed diameter is:
37.000 + (40.000 – 37.000)/3=38.000
4. Measure the diameter before second pass: 37.670
5. Run the second pass. The programmed diameter is:
38.000+(40.000-37.670)/2=39.165
6. Measure the diameter before the third pass: 38.825
7. Run the third pass. The programmed diameter is:
40.000+39.165-38.825=40.340
8. Measure the final diameter: 40.020. Deviation: 0.020