Approach function APPR LCT

Application

With the NC function APPR LCT, the control approaches the contour on a straight line, followed by a circular path tangential to the first contour element.

Coordinates of the first contour point are programmed with Cartesian coordinates.

Description of function

This NC function encompasses the following steps:

  • A straight line from the starting point PS to the auxiliary point PH
  • The straight line is tangential to the circular path.

  • The auxiliary point PH is determined based on the starting point PS, the radius R and the first contour point PA.

  • A circular path in the working plane from the auxiliary point PH to the first contour point PA
  • The circular path is uniquely defined by the radius R.

If you program the Z coordinates in the approach function, then the tool approaches simultaneously in three axes from the starting point PS to the auxiliary point PH.

Input

11 APPR LCT X+20 Y+20 Z-10 R5 RR F300

; Approach the contour on a tangential circular path

To navigate to this function:

Insert NC function All functions Path contour APPR APPR LCT

The NC function includes the following syntax elements:

Syntax element

Meaning

APPR LCT

Syntax initiator for a linear and circular approach function tangential to the contour

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

Coordinates of the first contour point

Fixed or variable number

Entry: absolute or incremental

Optional syntax element

R

Radius as a fixed or variable number

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

Example APPR LCT

11 L X+40 Y+10 R0 F300 M3

; Approach PS with R0

12 APPR LCT X+10 Y+20 Z-10 R10 RR F100

; Approach PA with RR; distance PH to PA: R10

13 L X+20 Y+35

; Complete the first contour element