HEIDENHAIN TNC 426 PB/M Technical Manual page 385

Step 4a
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Position C = 0
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Probe surface X2
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L = determined value
Step 4b
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Position B = -90
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Probe surface X1
∆X1 = determined value
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Position B = +90
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Probe surface X2
∆X2 = determined value
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MP7530.3 = {[0.5 * (∆X2 – ∆X1 – L – 2*(probe length) + 2*(ball radius))] – MP7530.0} / cos 45°
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December 2001 Tilting Axes 6 – 55