Contour Definition Programming - Siemens SINUMERIK User Manual

Rounding RND or RNDM
A circle contour element can be inserted with tangential connection between the linear and circle contours in any
combination.
See the following illustration for examples for inserting roundings:
Programming examples for rounding
N10 G0 X100 Z100 G94 F100
N20 G1 X80 RND=8
N30 X60 Z70
N40 X50 Z50
N50 G1 X40 FRCM= 200 RNDM=7.3
N60 G1 X20 Z10
N70 G1 X0 Z-45 RNDM=0
N80 M30
11.10.3

Contour definition programming

Functionality
If direct end point values for the contour are not visible in a machining drawing, angle values can also be used for straight
line determination. In a contour corner, you can insert the elements chamfer or rounding. The corresponding instruction
CHR= ... or RND=... is written in the block that leads to the corner.
Contour definition programming can be used in blocks with G0 or G1.
Theoretically, any number of straight-line blocks can be combined and a rounding or chamfer inserted in between. Every
straight line must be clearly identified by point values and/or angle values.
Programming
ANG=...
RND=...
CHR=...
Information
If radius and chamfer are programmed in one block, only the radius is inserted regardless of the programming sequence.
Angle ANG=
An angle can be entered to uniquely define the straight line path if only one end point coordinate of the plane is known for a
straight line or for contours across multiple blocks the cumulative end point. The angle is always referred to the Z axis
(normal case: G18 active). Positive angles are aligned counter-clockwise.
112
; Insert 1 rounding with radius 8 mm, feedrate F
; Modal rounding, radius 7.3 mm with special feedrate FRCM
(modal)
; continue inserting this rounding - to N70
; Modal rounding OFF
; Specification of angle to define a straight line
; Insert rounding, value: Radius of chamfer
; Insert chamfer, value: Side length of the chamfer
Programming and Operating Manual (Turning)
01/2017