Feed interpolation

from TwinCAT V2.10 B1308

Constant feed interpolation

Command

FCONST (standard setting)

Cancellation

FLIN

The programmed velocity is applied as fast as possible with the constant feed interpolation (default).

Feed interpolation 1:

Sample 1: 

N05 FCONST
N10 G01 X1000 F50000
N20 G01 X2500 F80000
N30 G01 X3500 F60000
...

Linear feed interpolation

Command

FLIN

Cancellation

FCONST

The linear feed interpolation transfers the velocity linearly over the path from v_start to v_end.

Feed interpolation 2:

Sample 1: 

N05 FCONST
N10 G01 X1000 F50000
N15 FLIN
N20 G01 X2500 F80000
N30 G01 X3500 F60000
...
Feed interpolation 3:

If the velocity on the segment transition has to be reduced more drastically than the programmed segment velocity, due to the geometry or M-function for example, then the linear velocity is maintained as long as possible. The reduced segment velocity will delayed, only if required dynamically.