
21.5-AXIS MACHINING FUNCTION PROGRAMMING B-63944EN/02
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Because the specified speed is the speed in the tangent direction of the
arc, the speed of the linear axis, when seen from the table coordinate
system, is:
arc theofLength
axislinear theofLength
×F .
Depending on parameter HTG (No.1403#5), the specified speed varies
as shown in the following table.
HTG (No.1403#5)
0 1
Tangential speed of the arc Synthetic speed of the linear axis
speed and tangential speed
No rotary axes are specified. Instead, the direction of the tool end
point is specified as I, J, K, as seen from the programming coordinate
system (the one fixed on the table when G43.5 is specified).
With a tool rotation type machine, I, J, K can be specified using the
G43.5 block. In the case of a table rotation type or mixed type
machine, however, these cannot be specified. Specifying them with
a table rotation type or mixed type machine causes alarm PS5421.
While performing compensation for the rotary axes, the CNC controls
the control points so that the tool center point moves helically with
respect to the table (workpiece). The end of the tool center point
comes to the point specified on the programming coordinate system.
CAUTION
1 Only arc radius R can be specified. (The distance
from the start point to the center of the arc cannot
be specified using I, J, and K.)
2 A round circle cannot be specified.
3 Any command that does not move the tool center
point with respect to the workpiece (one that moves
the rotary axes only) must be executed in G00 or
G01 mode.
4 See the CAUTION box for tool center point control
(type 2).