HEIDENHAIN TNC 426 PB/M Technical Manual page 387

Step 7
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Position C = 180
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Probe surface Y2
∆Y2 = determined value
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Z1 = ∆Y2 – probe length + ball radius
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If there is a difference between MP7530.0 and Z1, then MP7530.0 = 0.5 * (MP7530.0 + Z)
Step 8
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Position C = 0
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Position B = –90
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Probe surface Z
∆Z = determined value
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Position B = +90
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Probe surface Z
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Z = {[–0.5 * (∆Z + determined value) – probe length + ball radius] – Z1} / cos 45°
(Z1 see step 7)
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If there is a difference between MP7530.3 and Z, then MP7530.3 = 0.5 * (MP7530.3 + Z)
December 2001 Tilting Axes 6 – 57