
B-63943EN-1/02 7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL
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7.1.8 Automatic Corner Override
The movement of a tool in an inner corner or an inner arc is
automatically decelerated during cutter compensation, so that the load
on the tool is reduced, and a surface obtained by cutting becomes
smooth.
7.1.8.1 Inner corner automatic override (G62)
Explanation
- Overriding conditions
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. 7.1.8 (a)).
2° ≤ θ ≤ θp ≤ 178° in Fig. 7.1.8
θp 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.
θ
θ
θ
θ
:Tool
:Programmed path
:Cutter center path
1. Straight line-straight line 2. Straight line-arc
3. Arc-straight line 4. Arc-arc
Fig. 7.1.8 (a) Inner corner
- Overriding range
When an inner corner is found, the feedrate is overridden before and
after the intersection of the corresponding tool paths. Feedrate
override distances Le and Ls are linear dimensions between the
intersection of the tool paths and a point on either cutter center path
(Fig. 7.1.8 (b), Fig. 7.1.8 (c), Fig. 7.1.8 (d)). Le and Ls are specified
in parameters No.1713 and No.1714.