HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 107)

91 HEIDENHAIN TNC 410, TNC 426, TNC 430
Tool radius compensation
The NC block for programming a tool movement contains:
■ G41 or G42 for radius compensation
■ G43 or G44, for radius compensation with axis-parallel traverse
■ G40, if there is no radius compensation
Radius compensation becomes effective as soon as a tool is called
and is moved in the working plane with G41 or G42.
The TNC automatically cancels radius compensation if
you:
■ Program a positioning block with G40
■ Program a call with %...
■ Select a new program
For tool radius compensation, the TNC takes the delta values from
both the T block and the tool table into account.
Compensation value = R + DR
T
+ DR
TAB
, where
R is the tool radius R from the G99 block or tool
table
DR
T
is the oversize for radius DR in the T block (not taken
into account by the position display)
DR
TAB
is the oversize for radius DR in the tool table
Contouring without radius compensation: G40
The tool center moves in the working plane to the programmed
path or coordinates.
Applications: Drilling and boring, pre-positioning
(see figure at right)
5.3 T
ool Compensation
Y
X
Z
X
Y
R
R
G40
G41
Fkap5.pm6 29.06.2006, 08:06 91