Face Milling With A Specified Surface Normal Vector - Siemens SINUMERIK 840D sl Function Manual

W5: 3D tool radius compensation
3.1 Function
Cutter type
Bevel cutter
Bevel cutter with corner rounding
Tapered die-sinking cutter
- : is not evaluated.
Tool data
Tool dimensions
R
r
a
Note
If, in the NC program, a type number is specified that differs from that in the diagram, then the
system automatically uses tool type 110 (ball end mill).
Note
An alarm is output if the tool data limit values are violated.
Geometry and wear values of tool data have an additive effect, i.e. the tool form that is actually
used for the offset calculation is always described by the sum values.
In the CUT3DFD function (differential tool), only the wear value is considered as an offset value.
The geometry values are only necessary in this case for describing the tool form.
Tool length offset
The tool tip (intersecting point between the tool longitudinal axis and the workpiece surface) is
considered the reference point for the length offset.
Tool change
A new tool with changed dimensions (R, r, a) or other form can only be specified during the first
activation of the tool offset (i.e. during the transition from G40 to G41 or G42) or for an already
active offset only for new programming of G41 or G42. This rule does not apply to any other tool
data, e.g. tool lengths, so that tools can be loaded without reprogramming G41 or G42.
3.1.3.2

Face milling with a specified surface normal vector

Expanded options for orientation programming are provided for 3D face milling.
The tool offset for face milling cannot be calculated simply by specifying the path (e.g. of a line
in space). The surface to be machined must also be known. The necessary information about
the surface is provided to the controller with the surface normal vector.
The surface normal vector at the block beginning is programmed with A4, B4, C4, and the
vector at the block end with A5, B5, C5. Components of the surface normal vectors which are
not programmed are set to zero. The length of a vector programmed in this way is irrelevant. A
246
Type No.
155
156
157
Tool parameters
Geometry
$TC_DP6
$TC_DP7
$TC_DP11
R r
> 0 -
> 0 > 0
> 0 -
Wear
$TC_DP15
$TC_DP16
$TC_DP20
Function Manual, 06/2019, A5E47435126B AA
a
> 0
> 0
> 0
Tools