Siemens SINUMERIK 808D ADVANCED - Polar Coordinates, Pole Definition: G110, G111, G112

Programming and Operating Manual (Milling)
54 6FC5398-4DP10-0BA1, 01/2014
Programming example
N10 G70 X10 Z30
; Inch dimensions
N20 X40 Z50
;G70 continues to act
N80 G71 X19 Z17.3
; metric dimensioning from this point on
Information
Depending on the
default setting
you have selected, the control system interprets all geometric values as either metric
or
inch dimensions. Tool offsets and settable work offsets including their display are also to be understood as geometrical
values; this also applies to the feedrate F in mm/min or inch/min. The default setting can be set via machine data.
All examples listed in this manual are based on a
metric default setting
.
G70 or G71 evaluates all geometric parameters that directly refer to the
workpiece
, either as inches or metric units, for
example:
● Positional data X, Y, Z, ... for G0,G1,G2,G3,G33, CIP, CT
● Interpolation parameters I, J, K (also thread pitch)
● Circle radius CR
●
Programmable
work offset (TRANS, ATRANS)
● Polar radius RP
All remaining geometric parameters that are not direct workpiece parameters, such as feedrates, tool offsets, and
settable
work offsets, are not affected by
G70/G71
.
G700/G710
however, also affects the feedrate F (inch/min, inch/rev. or mm/min, mm/rev.).
8.2.5
Polar coordinates, pole definition: G110, G111, G112
Functionality
In addition to the common specification in Cartesian coordinates (X, Y, Z), the points of a workpiece can be specified using
the polar coordinates.
Polar coordinates are also helpful if a workpiece or a part of it is dimensioned from a central point (pole) with specification of
the radius and the angle.
Plane
The polar coordinates refer to the plane activated with G17 to G19. In addition, the third axis standing vertically on this plane
can be specified. When doing so, spatial specifications can be programmed as cylinder coordinates.
Polar radius RP=...
The polar radius specifies the distance of the point to the pole. It is stored and must only be written in blocks in which it
changes, after changing the pole or when switching the plane.
Polar angle AP=...
The angle is always referred to the horizontal axis (abscissa) of the plane (for example, with G17: X axis). Positive or
negative angle specifications are possible.
The polar angle remains stored and must only be written in blocks in which it changes, after changing the pole or when
switching the plane.