5 SUPPLEMENT
5-60
The program during polar coordinate interpolation mode is commanded by the
rectangular coordinate value on the polar coordinate interpolation plane. The axis
address of the rotational axis (C) is used for that of the command of the 2nd axis of the
plane (virtual axis). A command is given in mm or inches as with the 1st axis of the
plane (command by the axis address of the linear axis), and not in degrees. And
whether designation is given by the diameter or by the radius is not determined by the
1st axis of the plane, but the designation is the same as the rotational axis.
The feed rate is commanded using tangential speed (relative speed of the workpiece
and a tool) on the polar coordinate interpolation plane (rectangular coordinate system)
as F (mm/min or in/min is used for a unit of F).
The coordinate value of the virtual axis when G12.1 is commanded provides “0”. That
is, the polar coordinate interpolation is started taking the position where G12.1 is
commanded as the angle = 0.
B. Dynamic offsetting II
1. Command
When a workpiece fixed on the turntable is to be machined with the rotation of the table,
mismatching between the workpiece reference position (program origin) and the origin of
workpiece coordinates (center of rotation of the table) leads to an error in machining contour.
Provided that the vector of a particular deviation from the center of rotation to the workpiece
reference position is given as a “reference”, the “Dynamic Offsetting ΙΙ” function will calculate
for each command of rotation the deviation vector for the designated angular motion in order
to control the linear axes for an adequate movement to the ending point as programmed with
respect to the ideal workpiece origin, and thus to prevent the above-mentioned faulty
machining from occurring.
2. Notes
When the related parameters and reference dynamic offset are modified in the G54.2
mode, the modifications will become valid for the next G54.2Pn command onward.
The following function commands cannot be executed in the G54.2 mode:
Figure rotation (M98)
Coordinates rotation (G68)
G61.1, G61.2, G5P0, G5P2
Serial No. 294060
Copyright (c) 2013 YAMAZAKI MAZAK CORPORATION. All rights reserved.
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