Circular path CR

Application

You use a radius to program a circular path with the circular path function CR.

Description of function

The control moves the tool on a circular path, with the radius R, from the current position to the defined end point. The starting point is the end point of the preceding NC block. You can use at most two axes to define the new end point.

The starting and end points can be connected with four different circular paths of the same radius. The correct circular path is defined with the CCA center angle of the circular path radius R and the direction of rotation DR.

The algebraic sign of the circular path radius R is decisive for whether the control selects a center angle that is greater than or less than 180°.

The radius has the following effects on the center angle:

  • Smaller circular path: CCA<180°
  • Radius with a positive sign R>0

  • Longer circular path: CCA>180°
  • Radius with a negative sign R<0

With the direction of rotation you define whether the control moves along the circular path in a clockwise or counterclockwise direction.

Definition of the direction of rotation:

  • Clockwise: direction of rotation DR– (with radius compensation RL)
  • Counterclockwise: direction of rotation DR+ (with radius compensation RL)

10 L X+40 Y+40 RL F200 M3

11 CR X+70 Y+40 R+20 DR-

; Circular path 1

or

11 CR X+70 Y+40 R+20 DR+

; Circular path 2

or

11 CR X+70 Y+40 R-20 DR-

; Circular path 3

or

11 CR X+70 Y+40 R-20 DR+

; Circular path 4

For a full circle, program two circular paths in succession. The end point of the first circular path is the starting point of the second. The end point of the second circular path is the starting point of the first.

Input

11 CR X+50 Y+50 R+25 LIN_Z-2 DR- RL F250 M3

; Circular path with linear Z-axis superimpositioning

To navigate to this function:

Insert NC function All functions Path contour CR

The NC function includes the following syntax elements:

Syntax element

Meaning

CR

Syntax initiator for a circular path with a radius

X, Y, Z, A, B, C, U, V, W

End point of the circular path

Entry: absolute or incremental

Optional syntax element

R

Radius of the circular path as a fixed or variable number

LIN_X, LIN_Y, LIN_Z, LIN_A, LIN_B, LIN_C, LIN_U, LIN_V or LIN_W

Axis and value of the linear superimposition

Entry: absolute or incremental

Linear superimpositioning of a circular path

Optional syntax element

DR

Rotational direction of the arc

Optional syntax element

R0, RL, RR

Tool radius compensation

Tool radius compensation

Optional syntax element

F, FMAX, FZ, FU, FAUTO

Feed rate

Feed rate F

Fixed or variable number

Optional syntax element

M

M function

Miscellaneous Functions

Fixed or variable number

Optional syntax element

Note

The distance between the starting and end points must not be greater than the circle diameter.