Generation of compensation blocks

Generation of compensation blocks is not subject to restrictions in respect of the NC-block sequence, such as those applicable to direct or indirect TRC selection. The next block after the current block is used for computation of contour transitions between the programmed NC-blocks.

The contour transition is on straight lines (G25) by default or optionally on circular arcs (G26) with the option of feed rate adaptation (G10/G11).

The table below and the supplementary diagrams show all possible contour transitions, whereby both possible transitions (linear and circular intermediate blocks) are shown.

Insertion of blocks by the TRC LIN: Linear block, CIR: Circular block G25: Insertion of linear transition G26: Insertion of circular transition (2 LIN : The TRC inserts at transition 2 linear blocks).
	Angle range
	0° to 180°		180° to 270°		270° to 360°
progr. block sequence	G25	G26	G25	G26	G25	G26
LIN-LIN	0	0	0	1 CIR	1 LIN	1 CIR
LIN-CIR/CIR-LIN	0	0	1 LIN	1 CIR	2 LIN	1 CIR
CIR-CIR	0	0	2 LIN	1 CIR	3 LIN	1 CIR

Generation of compensation blocks 1: — Fig. 12.11: Example for contour transition to a linear for the block-sequence linear-linear

Generation of compensation blocks 2: — Fig. 12.12: Example for contour transition to a circular arc for the block-sequence linear-linear

Fig. 12.13: TRC-transitions: combination cases for 0° ß 180 ° (independent of G25 or G26, since no compensation blocks are added)
Combination type 1: 0° < ß ≤ 180°, G41	Combination type 3: 0° < ß ≤ 180°, G41

Combination type 2: 0° < ß ≤ 180°, G41	Combination type 4: 0° < ß ≤ 180°, G41

Fig. 12.14: TRC-transitions: combination cases for 180° ß 270°with linear interim blocks
Combination type 1: 180° < β ≤ 270°, G41	Combination type 3: 180° < β ≤ 270°, G41

Combination type 2: 180° < β ≤ 270°, G41	Combination type 4: 180° < β ≤ 270°, G41

Fig. 12.15: TRC transitions: Combination cases for 270° ß 360° with linear interim blocks
Combination type 1: 270° < ß ≤ 360°, G41	Combination type 3: 270° < ß ≤ 360°, G41

Combination type 2: 270° < ß ≤ 360°, G41	Combination type 4: 270° < ß ≤ 360°, G41

Fig. 12.16: TRC transitions: Combination cases for 180° ß 270° with circular interim blocks
Combination type 1: 180° < β ≤ 270° , G41, G26	Combination type 3: 180° < β ≤ 270° , G41, G26

Combination type 2: 180° < β ≤ 270° , G41, G26	Combination type 4: 180° < β ≤ 270° , G41, G26

Fig. 12.17: TRC transitions: Combination cases for 270° ß 360° with circular interim blocks

Combination type 1: 270° < ß ≤ 360°, G41, G26	Combination type 3: 270° < ß ≤ 360°, G41, G26

Combination type 2: 270° < ß ≤ 360°, G41, G26	Combination type 4: 270° < ß ≤ 360°, G41, G26