HEIDENHAIN TNC 426 (280 476) - Manual (Page 390)

HEIDENHAIN TNC 426, TNC 430 363
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.5 Calculating Cir
c
les
10.5 Calculating Circles
Function
The TNC can use the functions for calculating circles to calculate the
circle center and the circle radius from three or four given points on the
circle. The calculation is more accurate if four points are used.
Application: These functions can be used if you wish to determine the
location and size of a bore hole or a pitch circle using the
programmable probing function.
The coordinate pairs for three points of the circle must be stored in
Parameter Q30 and in the following five parameters – here to Q35.
The TNC then stores the circle center of the reference axis (X with
spindle axis Z) in Parameter Q20, the circle center of the minor axis (Y
with spindle axis Z) in Parameter Q21 and the circle radius in
Parameter Q22.
The coordinate pairs for four points of the circle must be stored in
Parameter Q30 and in the following seven parameters – here to Q37.
The TNC then stores the circle center of the reference axis (X with
spindle axis Z) in Parameter Q20, the circle center of the minor axis (Y
with spindle axis Z) in Parameter Q21 and the circle radius in
Parameter Q22.
Function Soft key
FN23: Determining the CIRCLE DATA from three
points
Example: FN23: Q20 = CDATA Q30
Function Soft key
FN24: Determining the CIRCLE DATA from four
points
Example: FN24: Q20 = CDATA Q30
Note that FN23 and FN24 beside the resulting parameter
also overwrite the two following parameters.