Programming instructions

5-36
Tool Corrections NC Programming 17VRS
DOK-MTC200-NC**PRO*V17-ANW1-EN-P
Insert Contour Transition Arc 'G43'
When tool path compensation is active (G41 or G42) G43 inserts an arc
as the contour transition element for outside corners.
The tool center point must travel around outside corners so that they are
not damaged. An arc should always be inserted for circle
↔
straight line
or circle
↔
circle contour transitions.
•
G43 is the power-on state. It is modally active until it is overwritten by a
G44.
•
G43 can only be activated via G41 or G42. If tool path compensation is
canceled (G40), G43 has no effect. G43 is reset automatically at the
end of the program (RET) or by the BST, M02, M30.
•
When an arc is inserted as the contour transition via G43, the CNC
automatically generates an additional transition NC-block. This NC-
block is considered to be an independent NC-block, and as such it
must be started separately in single-block processing mode.
•
The conditions which must be met when transition elements are in-
serted are described in section „Contour Transitions“ on page 5-26.
R
S
S2 '
S1 '
S1 '
S
S2 '
R
R tool radius
S programmed NC-block transition point
S1 ' corrected NC-block transition point 1
S2 ' corrected NC-block transition point 2
Fig. 5-29: Inserting an arc as the contour transition
Inserting Contour Transition Chamfer 'G44'
When tool path compensation (G41 or G42) is active, G44 can be used
to insert a chamfer as the contour transition with outside corners whose
transition angle exceeds 90°.
With outside corners having a transition angle greater than or equal to
90°, the corrected transition point is defined as the intersection of the lines
parallel to the contour.
•
A chamfer as contour transition can only be used for transitions be-
tween two straight lines. With all other transition pairs, an arc is auto-
matically used as the transition element, even if G44 is active.
•
After it is selected, G44 remains modally active until it is canceled by
G43 or until it is automatically reset at the end of the program or by
BST, M02, M30. G44 can only be activated via G41 or G42. If tool path
compensation is canceled (G40), G44 has no effect.
•
When a chamfer is inserted as the contour transition via G44, the CNC
automatically generates an additional transition NC-block. This NC-
block is considered to be an independent NC-block, and as such it
must be started separately in single-block processing mode.
•
The conditions which must be met when transition elements are in-
serted are described in section „Contour Transitions“ on page 5-26