Programming instructions

NC Programming 17VRS Tool Corrections
5-37
DOK-MTC200-NC**PRO*V17-ANW1-EN-P
= tool radius
= programmed NC block transition point
= corrected NC blocktransition point 2
R
S
S1 '
= corrected NCblock transition point 1
S2 '
R
R
S
S1 '
S2 '
= tool radius
= programmed NC block point
R
S
S '
= corrected block transition point
S
S '
R
transition angle > 90°
transition angle < 90°
Fig. 5-30: Inserting a chamfer as the contour transition
Constant Feed on Tool Center Line 'G98'
When tool path compensation is active (G41 or G42), no path feedrate
correction is performed for arcs when G98 is programmed. Thus, the pro-
grammed path feedrate applies to the tool center line and not the work-
piece contour.
In the case of convex arcs (outside circle) this results in a reduction of the
path feedrate at the contour; with concave arcs (inside circle) it results in
an increase.
•
G98 is the power-on state. It is modally active until it is overwritten by a
G99. G98 can only be activated via G41 or G42. If tool path compen-
sation is canceled (G40), G98 has no effect. G98 is reset automatically
at the end of the program (RET) or by the BST, M02, M30 command.
Constant Feed at the Contour 'G99'
When tool path compensation is active (G41 or G42), path feedrate cor-
rection is performed for arcs when G99 is programmed. The path fee-
drate at the contour corresponds to the programmed value when G99 is
active.
In the case of convex arcs (outside circle) this results in an increase of
the path feedrate on the tool center line path; with concave arcs (inside
circle) it results in a decrease.
•
After it is selected, G99 remains modally active until it is canceled by
G98 or until it is automatically reset at the end of the program (RET) or
by BST, M02, M30. G99 can only be activated via G41 or G42. If tool
path compensation is canceled (G40), G99 has no effect.