05.91 4 Programming of Motion Blocks
4.2.4 Cylindrical interpolation
Example:
N10 G01 X50 Y50 F500
L
F
N20 G02 X90 Y70 I40 J–30 Z10 V20 W30
L
F
The required feedrate must be programmed before the helical block or in the helical block at
the latest. The programmed feedrate acts on the circular axes only. The linear axes are
controlled to reach the end point as the circular axes arrive at the circle end point.
The axes involved in interpolation are monitored for their maximum permissible speed. If this
limit is exceeded (i.e. V
prog
>V
max
) this will lead to a feedrate limitation.
When simulating five-axis helical interpolations, these are not drawn at all or only partly (linear).
An alarm is not issued however.
4.2.4 Cylindrical interpolation
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The ”Cylindrical interpolation” function is an option.
The order code is: B73
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If cylindrical interpolation is selected, the rotary axis must not be
programmed with G68 (only G90, G91).
Cylindrical interpolation permits machining of cylindrical paths with one rotary axis and one
linear axis and a constant rotary table diameter. Both linear and circular contours can be
programmed. Circular contours are possible only with radius programming. Input of the
interpolation parameters I, J and K is not possible. The plane must be defined with G16. The
position of the rotary axis is entered in degrees.
Conversion to the circumferential dimensions of the working diameter is performed internally in
the control. The relationship of working diameter to unit diameter is programmed under G92 P..
for this purpose.
The unit diameter d is derived from the relation ·d = 360.
Unit diameter =
360
in mm or inch
Input system Unit diameter
Metric 114.59156 mm
Inches (10
-4
) 114.5916 inches
Inches (10
-5
) 114.59156 inches
No characters other than the axis name, the block number, the comment and the end-of-block
character must be written in a block containing G92 P..
The input resolution for P is 10
-5
. The value range for P is 0.00001 to 99.99999.
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 4–15
SINUMERIK 880, (PG)
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