
A-78640E
Sheet
Title
Draw
No.
04 Feb.08.’03 Part of (4) is added or modified. Addition of 2.16.5
03 Jul.02.’02 A. Fukumoto Part of (3) is added or modified. T.Endo
02 May.13.’02 A. Fukumoto Addition of Tool Radius control for 5-axis machining etc T.Endo
Ed. Date Design Description
Date Jan.25.’02 Desig. A.Fukumoto Apprv. T.Endo
FANUC Series 16i /18i -TB
Specifications of AI High-Precision Contour Control /
I Nano High-Precision Contour control
19/190
Table 2.13.3 (a)
Profile Portions having mainly
a small radius of
curvature
Portions having mainly
a large radius of
curvature
Example of machined
parts
Automobile parts Decorative parts, such as
body side moldings
Length of line segment Short Long
Resulting surfaces
produced using AI
HPCC / AI NANO HPCC
Smooth surface even
when machining is
performed exactly as
specified by a program
Uneven surfaces may
result when machining is
performed exactly as
specified by a program
Fig. 2.13.3(b) Example of uneven surfaces (polygon) resulting from
machining that precisely follows the line segments.
In smooth interpolation mode, the CNC automatically determines, according to
the program command, whether an accurate figure is required, such as at
corners, or a smooth figure is required where the radius of curvature is large. If a
block specifies a travel distance or direction that differs greatly from that in the
preceding block, smooth interpolation is not performed for that block. Linear
interpolation is performed exactly as specified by the program command.
Programming is thus very simple.
Note
When the result of the automatic judgment of CNC is different from the
movement which the programmer intended, cancel a smooth
interpolation temporarily or change the instruction point or the
correspondence of the adjustment of the parameter etc. is needed.
N1
N2
N3 N4
N5
N6
N7
N8
N17
N16
N14
N13
N11
N12
N15
N10
N9
Linear interpolation
Interpolated by smooth curve
Linear interpolation
Interpolated by smooth curve
N1
N2
N3 N4
N5
N6
N7
N8
N17
N16
N14
N13
N11
N12
N15
N10
N9
Smooth interpolation
Fig. 2.13.3 (c) Smooth Interpolation and Linear Interpolation