HEIDENHAIN iTNC 530 (340 49x-01) - Manual (Page 226)

226 6 Programming: Programming Contours
6.7 Cont
our Mo
v
e
ments—Spline Int
e
rp
olation (Sof
tw
ar
e Option
2)
6.7 Contour Movements—Spline
Interpolation (Software
Option 2)
Function
If you wish to machine contours that are described in a CAD system
as splines, you can transfer them directly to the TNC and execute
them. The TNC features a spline interpolator for executing third-
degree polynomials in two, three, four, or five axes.
Example: Block format for three axes
The TNC executes the spline block according to the following third-
degree polynomials:
X(t) = K3X · t 3 + K2X · t 2 + K1X · t + X
Y(t) = K3Y · t
3
+ K2Y · t
2
+ K1Y · t + Y
Z(t) = K3Z · t
3
+ K2Z · t
2
+ K1Z · t + Z
whereby the variable t runs from 1 to 0. The incrementation of t
depends on the feed rate and the length of the spline.
Example: Block format for five axes
You cannot edit spline blocks in the TNC. Exception: Feed
rate F and miscellaneous function M in the spline block.
7 L X+28.338 Y+19.385 Z-0.5 FMAX Spline starting point
8 SPL X24.875 Y15.924 Z-0.5
K3X-4.688E-002 K2X2.459E-002 K1X3.486E+000
K3Y-4.563E-002 K2Y2.155E-002 K1Y3.486E+000
K3Z0.000E+000 K2Z0.000E+000 K1Z0.000E+000 F10000
Spline end point
Spline parameters for X axis
Spline parameters for Y axis
Spline parameters for Z axis
9 SPL X17.952 Y9.003 Z-0.500
K3X5.159E-002 K2X-5.644E-002 K1X6.928E+000
K3Y3.753E-002 K2Y-2.644E-002 K1Y6.910E+000
K3Z0.000E+000 K2Z0.000E+000 K1Z0.000E+000
Spline end point
Spline parameters for X axis
Spline parameters for Y axis
Spline parameters for Z axis
10 ...
7 L X+33.909 X-25.838 Z+75.107 A+17 B-10.103 FMAX Spline starting point
8 SPL X+39.824 Y-28.378 Z+77.425 A+17.32 B-12.75
K3X+0.0983 K2X-0.441 K1X-5.5724
K3Y-0.0422 K2Y+0.1893 1Y+2.3929
K3Z+0.0015 K2Z-0.9549 K1Z+3.0875
K3A+0.1283 K2A-0.141 K1A-0.5724
K3B+0.0083 K2B-0.413 E+2 K1B-1.5724 E+1 F10000
Spline end point
Spline parameters for X axis
Spline parameters for Y axis
Spline parameters for Z axis
Spline parameters for A axis
Spline parameters for B axis with exponential
notation
9 ...