Continuous-Path Mode; General Functionality - Siemens SINUMERIK 840D sl Function Manual

B1: Continuous-path mode, Exact stop, Look Ahead

4.3 Continuous-path mode

Value
4
5
4.3 Continuous-path mode
4.3.1

General functionality

Continuous-path mode
In the 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 the continuous-path mode is selected.
Continuous-path mode causes the smoothing and tangential shaping of angular block
transitions by local changes in the programmed contour. The extent of the change relative to
the programmed contour can be limited by specifying the overload factor or rounding criteria.
Continuous-path mode:
● Contour rounding.
● Reduces machining times by eliminating braking and acceleration processes that are
required to fulfill the exact-stop criterion.
● Improves cutting conditions because of the more constant velocity.
Continuous-path mode is suitable if:
● A contour must be traversed as quickly as possible (e.g. with rapid traverse).
● The exact contour may deviate from the programmed contour within a specific tolerance
for the purpose of obtaining a continuous contour
Continuous-path mode is not suitable if:
● A contour is to be traversed precisely.
● An absolutely constant velocity is required.
184
Meaning
Like 0, in addition, the override of the next non-G0 block is taken into account with LookAhead
in the G0 block during the transition from G0 to non-G0.
Like 0; in addition, the override of the next block is taken into account with LookAhead during
the transition from G0 to non-G0 and from non-G0 to G0.
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions