Siemens SINUMERIK 828D Manual page 98

3.5
Spline interpolation
Curve interpolation
(ORICURVE)
98
Important functions for 3- to 5-axis machining
Spline interpolation (double spline ORICURVE)
2
1
ORICURVE
© Siemens AG All rights reserved SINUMERIK, Manual, Mold-Making with 3- to 5-Axis Simultaneous Milling
With spline interpolation, the movement of the
orientation vector is defined by the tool tip's
path
1
tool
2
If, for example, you wanted to use
circumferential milling to create an inclined
surface, you would define the surface on
which the milling cutter should move using two
spline curves at the top and bottom ends of
the tool
The advantage of this is that it enables you to
define a wide variety of surfaces for machining
with a high degree of precision.
Spline interpolation is the best type of
interpolation available, but it is also the most
involved and calls for special syntax in the NC
program that must be supported by the CAM
system.
Spline / double spline interpolation
Orientation interpolation with specification of the tool tip motion
and that of a second point on the tool. The path of the second
point is defined via XH=... YH=... ZH=..., in conjunction with
BSPLINE as a control polygon with POLY as polynomial:
PO[XH] = (xe, x2, x3, x4, x5)
PO[YH] = (ye, y2, y3, y4, y5)
PO[ZH] = (ze, z2, z3, z4, z5)
If the BSPLINE or POLY additional information is omitted,
straightforward linear interpolation will be performed accordingly
between the start and the end orientation.
and the path of a second point on the
(1, 2).