Smooth Approach And Retraction - Siemens SINUMERIK 808D User Manual

D i splay
The content of the active system variables is visible on the window opened through the following key operations:
→
Wi ndow display:
① = $AC_TOTAL_PARTS
② = $AC_REQUIRED_PARTS
③ =$AC_ACTUAL_PARTS
$AC_SPECIAL_PARTS is not available for display.
④ = $AC_OPERATING_TIME
You can also select whether to activate the workpiece counter function through the following operating area:
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11.17

Smooth approach and retraction

Fu n ctionality
The function "Smooth approach and retraction" (SPR) is intended to approach the beginning of a contour tangentially
("smooth"), to a large degree independently of the position of the starting point. The control system will calculate the
intermediate points and generate the required traversing blocks. This function is used preferably in conjunction with the tool
radius compensation (TRC). The G41 and G42 commands determine the approach/retraction direction to the left or right of
the contour.
The approach/retraction path (straight line, quarter or semi-circle) is selected using a group of G commands. To
parameterize this path (circle radius, length, approach straight line), special addresses can be used; this also applies to the
feedrate of the infeed motion. The infeed motion can additionally be controlled via another G group.
Programming
G147 ; Approach with a straight line
G148 ; Retraction with a straight line
G247 ; Approach with a quadrant
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017
→
→
⑤ = $AC_CYCLE_TIME
⑥ = $AC_CUTTING_TIME
⑦ = $AN_SETUP_TIME
⑧ = $AN_POWERON_TIME
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