4 Programming
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4.3 Tool Compensation Values
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For each tool, the control adjusts the spindle path
in the tool axis by the compensation value for the
tool length. In the working plane it compensates
the tool radius.
Fig. 4.6:
The TNC must compensate the length and radius of the tool
Effect of tool compensation values
Tool length
The compensation value for the tool length is calculated as follows:
L
L
Compensation value = L + DL-TC + DL-TAB
where L: is the tool length L (from the TOOL DEF block or
the tool table)
DL-TC: is the oversize for length DL in the TOOL CALL
block (not taken into account for the position values)
DLJAB:
is the oversize for length DL in the tool table
Length compensation becomes effective automatically as soon as a tool
is called and the tool axis moves. Length compensation is cancelled by
calling a tool with the length L = 0.
tf a positive length compensation
was in efftjct before TWL CALL 0, the distance to the workpiece is decreased. In
an incremental movement of ohs tool axis immediaely after a TOOL CALL, the diffsrenca in length between the old
and new tools is moved in addition to the programmed value.
Tool radius
The compensation value for the tool radius is calculated as follows:
Compensation value
q
R + DR-TC + DR-TAB
where R: is the tool radius R (from the TOOL DEF block or
the tool table)
DR-TC: is the oversize for radius DR in the TOOL CALL
block (not taken into account for the position values)
DR-TAB: is the oversize for radius DR in the tool table
Radius compensation becomes effective as soon as a tool is called and is
moved in the working plane with RL or RR. Radius compensation is
cancelled by programming a positioning block with RO.
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TNC370
4-15
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