Calculating Circles - HEIDENHAIN ITNC 530 User Manual

11.5 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.
Function
FN23: Determining the CIRCLE DATA from three
points
Example: FN23: Q20 = CDATA Q30
The coordinate pairs for three points of the circle must be stored in
Parameter Q30 and in the following five parameters, i.e. 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.
Function
FN24: Determining the CIRCLE DATA from four
points
Example: FN24: Q20 = CDATA Q30
The coordinate pairs for four points of the circle must be stored in
Parameter Q30 and in the following seven parameters, i.e. 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.
Note that FN23 and FN24 automatically overwrite the
resulting parameter and the two following parameters.
HEIDENHAIN iTNC 530
Soft key
Soft key
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