Siemens SINUMERIK 840D sl Function Manual page 1028

Grinding-Specific Tool Offset and Tool Monitoring (W4)
Online tool radius compensation
18.4 Online tool radius compensation
General information
When the longitudinal axis of the tool and the contour are perpendicular to each other, the
offset can be applied as a length compensation to one of the three geometry axes (online
tool length compensation).
If this condition is not fulfilled, then the offset quantity can be entered as a real radius
compensation value (online tool radius compensation).
Enabling of function
The online tool-radius offset is activated via the machine data:
MD20254 $MC_ONLINE_CUTCOM_ENABLE (enable online tool radius compensation).
Activation/deactivation
An online tool radius compensation is activated and deactivated by means of commands
FTOCON and FTOCOF
(in the same way as an online tool length compensation).
Parameterization
The parameters of the online tool offset are set using commands PUTFTOCF and PUTFTOC.
Parameter "LENGTH 1_2_3" must be supplied as follows for an online tool radius
compensation:
Parameter <length 1_2_3> = 4
Wear parameter to which correction value is added.
Supplementary conditions
● A tool radius compensation, and thus also an online tool radius compensation, can be
● The online offset values should be low in comparison to the original radius to prevent the
● When online tool radius compensation is applied to grinding and turning tools (types 400-
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activated only when the selected tool has a radius other than zero. This means that
machining operations cannot be implemented solely with a tool radius compensation.
permitted dynamic tolerance range from being exceeded when the offset is overlaid on
the axis movement.
599), the compensation value is applied as a function of the tool point direction, i.e. it acts
as a radius compensation when tool radius compensation is active and as a length
compensation when tool radius compensation is deactivated in the axes specified by the
tool point direction.
On all other tool types, the compensation value is applied only when tool radius
compensation has been activated with G41 or G42. The compensation value is canceled
when tool radius compensation is deactivated with G40.
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions