·182·
Programming manual
CNC 8055
CNC 8055i
9.
CANNED CYCLES
·M· & ·EN· MODELS
SOFT: V02.2X
G87. Rectangular pocket canned cycle.
9.13 G87. Rectangular pocket canned cycle.
This cycle executes a rectangular pocket at the point indicated until the final programmed coordinate
is reached.
It is possible to program, in addition to milling pass and feedrate, a final finishing step with its
corresponding milling feedrate.
In order to obtain a good finish in the machining of the pocket walls, the CNC will apply a tangential
entry and exit to the last milling step during each cutting operation.
Working in Cartesian coordinates, the basic structure of the block is as follows:
G87 G98/G99 X Y Z I J K B C D H L V
[ G98/G99 ] Withdrawal plane
G98 The tool withdraws to the Initial Plane, once the pocket has been made.
G99 The tool withdraws to the Reference Plane, once the pocket has been made.
[ X/Y±5.5 ] Machining coordinates
These are optional and define the movement of the axes of the main plane to position the tool at
the machining point.
This point can be programmed in Cartesian coordinates or in polar coordinates, and the coordinates
may be absolute or incremental, according to whether the machine is operating in G90 or G91.
[ Z±5.5 ] Reference plane
Defines the reference plane coordinate.
When programmed in absolute coordinates, it will be referred to the part zero and when programmed
in incremental coordinates, it will be referred to the starting plane (P.P.).
If not programmed, it assumes as reference plane the current position of the tool. Thus, the starting
plane (P.P.) and the reference plane (P.R.) will be the same.
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