
5.FEED FUNCTIONS PROGRAMMING B-63944EN/02
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5.4.2 Automatic Corner Override
When cutter compensation is performed, the movement of the tool is
automatically decelerated at an inner corner and internal circular area.
This reduces the load on the tool and produces a smoothly machined
surface.
5.4.2.1 Automatic override for inner corners (G62)
Explanation
- Override condition
When G62 is specified, and the tool path with cutter compensation
applied forms an inner corner, the feedrate is automatically overridden
at both ends of the corner.
There are four types of inner corners (Fig. 5.4.2(a)).
2°≤θ≤θp≤178° in Fig. 5.4.2(a)qp is a value set with parameter No.
1711. When θ is approximately equal to θp, the inner corner is
determined with an error of 0.001,or less.
:Cutter center path
:Tool
:Pro
rammed
ath
θ
θ
1. Straight line-straight line 2. Straight line-arc
3. Arc-straight line 4. Arc-arc
Fig. 5.4.2(a) Inner corner
- Override range
When a corner is determined to be an inner corner, the feedrate is
overridden before and after the inner corner. The distances Ls and Le,
where the feedrate is overridden, are distances from points on the
cutter center path to the corner (Fig. 5.4.2(b), Fig. 5.4.2(c), Fig.
5.4.2(d)). Ls and Le are set with parameter Nos. 1713 and 1714.
Programmed path
Le
a
b
Ls
Cutter center path
The feedrate is overridden from point a to point b.
FIg. 5.4.2.1 (b) Override Range (Straight Line to Straight Line)