Approach functions APPR LN and APPR PLN

Application

The control uses these functions to approach a contour on a straight line perpendicular to the first contour point. You use APPR LN to define the starting point of the contour with Cartesian coordinates, and APPR PLN for polar coordinates.

Description of function

8H000_39
  • The control approaches the contour as follows:
  • On a straight line from the starting point PS to an auxiliary point PH
  • On a straight line, perpendicularly from the auxiliary point PH to the first contour point PA
  • The auxiliary point PH is separated from the first contour point PA by the distance LEN.

 
Tip

If you program R0, the control stops the machining/simulation with an error message.

This behavior differs from the iTNC 530 control.

Programming APPR LN and APPR PLN

 
Tip

If you want to program this path shape with polar coordinates, then you must first define a pole CC.

Polar coordinate datum at pole CC

  1. To define the approach function:
  2. Use any path function to approach the starting point PS
ApprDep

  1. Select APPR DEP
  2. The control opens the Insert NC function window.
ProgramApprLnIcon

  1. Select the path shape, for example APPR LN
  2. Define the coordinates of the first contour point PA
  3. Use LEN to define the positive distance to the auxiliary point PH
  4. Select radius compensation RR/RL

Example APPR LN

11 L X+40 Y+10 R0 FMAX M3

; Approach PS without radius compensation

12 APPR LN X+10 Y+20 Z-10 LEN15 RR F100

; PA with radius compensation RR; distance PH to PA: LEN 15

13 L X+20 Y+35

; End point of first contour element

14 L ...

; Next contour element