Continuous-Path Mode; General - Siemens SINUMERIK 802D sl Function Manual

Continuous Path Mode, Exact Stop and LookAhead (B1)

3.4 Continuous-path mode

3.4 Continuous-path mode
3.4.1

General

In continuous path mode, the path velocity is not decelerated for the block change in order to
permit the fulfillment of an exact stop criterion. The objective of this mode is to avoid rapid
deceleration of the path axes at the block-change point so that the axis velocity remains as
constant as possible when the program moves to the next block. To achieve this objective,
the "LookAhead" function is also activated when continuouspath mode (G64) is selected.
Continuouspath mode causes:
● Rounding of the contour.
● Shorter machining times through elimination of braking and acceleration processes that
● Improved cutting conditions as the velocity is more uniform.
The continuous-path mode is suitable if a contour is to be traversed as quickly as possible.
Continuous-path mode is suitable if:
● A contour is to be traversed precisely.
● An absolutely constant velocity is required.
Implicit exact stop
In some cases, an exact stop needs to be generated in continuouspath mode to allow the
execution of subsequent actions. In such situations, the path velocity is reduced to zero.
● If auxiliary functions are output before the traverse motion, the previous block is only
● If auxiliary functions are to be output after the traverse motion, they are output after the
● If an executable block contains no travel information for the path axes, the previous block
● A block is terminated on interpolator end if the following block contains the changeover of
● If the function "Empty buffer" (STOPRE) is programmed, the previous block is terminated
62
are required to comply with the exact-stop criterion.
terminated when the selected exact-stop criterion is fulfilled.
interpolator end of the block.
is terminated on reaching the selected exact stop criterion.
the acceleration profile BRISK/SOFT.
when the selected exact stop criterion is reached.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0