HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 95)

79 HEIDENHAIN TNC 410, TNC 426, TNC 430
5.2 Tool Data
You usually program the coordinates of path contours as they are
dimensioned in the workpiece drawing. To allow the TNC to
calculate the tool center path — i.e. the tool compensation — you
must also enter the length and radius of each tool you are using.
Tool data can be entered either directly in the part program with
G99 or separately in tool tables. In a tool table, you can also enter
additional data on the specific tool. The TNC will consider all the
data entered for the tool when executing the part program.
Tool numbers and tool names
Each tool is identified by a number between 0 and 254. If you are
working with tool tables, you can use higher numbers (not TNC 410)
and you can also enter a tool name for each tool (not TNC 410).
The tool number 0 is automatically defined as the zero tool with the
length L=0 and the radius R=0. In tool tables, tool 0 should also be
defined with L=0 and R=0.
Tool length L
There are two ways to determine the tool length L:
1 The length L is the difference between the length of the tool and
that of a zero tool L
0
.
For the algebraic sign:
■ The tool is longer than the zero tool L>L
0
■ The tool is shorter than the zero tool: L
0
To determine the length:
ú Move the zero tool to the reference position in the tool axis
(e.g. workpiece surface with Z=0).
ú Set the datum in the tool axis to 0 (datum setting).
ú Insert the desired tool.
ú Move the tool to the same reference position as the zero tool.
ú The TNC displays the difference between the current tool and the
zero tool.
ú Using the key for ”actual position capture” (TNC 426 B, TNC 430)
or the soft key ACT. POS. Z (TNC 410), transfer the value to the
G99 block or the tool table.
2 Determine the tool length L with a tool presetter. This allows you
to enter the determined value directly in the G99 tool definition
block without further calculations.
5.2 T
ool D
ata
Z
X
L
0
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