6 – 60 HEIDENHAIN Technical Manual TNC 426, TNC 430
Step 2b
Determining the Z offset:
n Position A = 0
n Place dial indicator against
the spindle nose
n MP7530.0 = determined
value – cylinder radius
Step 3
Determining the Y offset:
n Position A = 0
n Position C = 0 and set C = 0
n Position C = 180
n Read Y offset from the dial
indicator
n MP7530.4 = (0.5 *
(determined value)) –
MP7530.1
0
180°
0
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