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.

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The starting and end points can be connected with four different circular paths of the same radius. You define the correct circular path with the central angle CCA 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 central angle that is greater than or less than 180°.

  • The radius has the following effects on the central 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)
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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.

Programming a circular path CR

  1. To program a circular path with CR:
Cr

  1. Select CR
  2. Define the coordinates of the end point
  3. Define a positive or negative radius
  4. Select the direction of rotation
  5. Define the feed rate, if necessary
  6. Define a miscellaneous function, if necessary

Note

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

Example

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