Programming
10.2 Positional data
Surface grinding
214 Programming and Operating Manual, 11/2012, 6FC5398-5CP10-3BA0
Information
Depending on the default setting you have chosen, 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.).
10.2.5 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 also be specified using 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.
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