
5.PROGRAM INPUT NC FUNCTION B-63942EN/02
- 228 -
When a target figure passing through A, A', and B in this order is
given by a program, the specified area is removed by ∆d (depth of cut),
with the finishing allowance specified by ∆u/2 and ∆w left.
- Selection of type I or II
For G72, there are types I and II.
When the target figure has pockets, be sure to use type II.
Escaping operation after rough cutting in the direction of the second
axis on the plane (X-axis for the ZX plane) differs between types I and
II. With type I, the tool escapes to the direction of 45 degrees. With
type II, the tool cuts the workpiece along the target figure. When the
target figure has no pockets, determine the desired escaping operation
and select type I or II.
- Selecting type I or II
In the start block for the target figure (sequence number ns), select
type I or II.
(1) When type I is selected
Specify the first axis on the plane (Z-axis for the ZX plane). Do
not specify the second axis on the plane (X-axis for the ZX
plane).
(2) When type II is selected
Specify the second axis on the plane (X-axis for the ZX plane)
and first axis on the plane (Z-axis for the ZX plane).
When you want to use type II without moving the tool along the
second axis on the plane (X-axis for the ZX plane), specify the
incremental programming with travel distance 0 (U0 for the ZX
plane).
Example)
Type I Type II
G72 10.0 R5.0 ; G72 10.0 R5.0 ;
G72 P100 Q200....; G72 P100 Q200....;
N100 Z(W)_ ; N100 X(U)_ Z(W)_;
:
:
N200..............; N200..............;
- Differences from G71 (Type I)
G72 differs from G71 in the following points:
(1) G72 cuts the workpiece with moving the tool in parallel with the
second axis on the plane (X-axis on the ZX plane).
(2) In the start block in the program for a target figure (block with
sequence number ns), only the first axis on the plane (Z-axis (W-
axis) for the ZX plane) must be specified.