296 Programming: Q Parameters
9.11 Programming Examples
Example: Concave cylinder machined with spherical cutter
Program sequence
îš„ This program functions only with a spherical
cutter. The tool length refers to the sphere
center.
îš„ The contour of the cylinder is approximated by
many short line segments (defined in Q13). The
more line segments you define, the smoother
the curve becomes.
îš„ The cylinder is milled in longitudinal cuts (here:
parallel to the Y axis).
îš„ The machining direction can be altered by
changing the entries for the starting and end
angles in space:
Clockwise machining direction:
starting angle > end angle
Counterclockwise machining direction:
starting angle < end angle
îš„ The tool radius is compensated automatically.
%CYLIN G71 *
N10 Q1 = +50 *
Center in X axis
N20 Q2 = +0 *
Center in the Y axis
N30 Q3 = +0 *
Center in Z axis
N40 Q4 = +90 *
Starting angle in space (Z/X plane)
N50 Q5 = +270 *
End angle in space (Z/X plane)
N60 Q6 = +40 *
Cylinder radius
N70 Q7 = +100 *
Length of the cylinder
N80 Q8 = +0 *
Rotational position in the X/Y plane
N90 Q10 = +5 *
Allowance for cylinder radius
N100 Q11 = +250 *
Feed rate for plunging
N110 Q12 = +400 *
Feed rate for milling
N120 Q13 = +90 *
Number of cuts
N130 G30 G17 X+0 Y+0 Z-50 *
Definition of workpiece blank
N140 G31 G90 X+100 Y+100 Z+0 *
N160 T1 G17 S4000 *
Tool call
N170 G00 G40 G90 Z+250 *
Retract the tool
N180 L10.0 *
Call machining operation
N190 Q10 = +0 *
Reset allowance
N200 L10.0
Call machining operation
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