Define acceleration (G08/G09/G900/G901)
Notice

Acceleration definition operations are only effective in connection with the linear slope.
G08 | Acceleration at block start | (modal, initial state) |
G09 | Deceleration at block end | (non-modal, effect dependent on G901/G900) |
G901 | Deceleration after block end; can be cancelled blockwise by G09 | (modal) |
G900 | Deceleration at block end independent of | (modal) |
If two consecutive NC blocks are programmed at different feedrates, a "soft" adaptation occurs at the block limit. As specified by G08, an acceleration takes place only at block start. G09 specifies that a deceleration to the feedrate of the next block should already occur at the end of the current block.
G09 is the default setting at program start. The G901 function defines the default setting for deceleration only after block end. The inverse G function G900 is a change-back function and is equivalent to the channel default setting.
Attention

During transition from G00 to G01, G02 or G03, G09 is always active, i.e. deceleration at block end down to the velocity of the following block.
If the path velocity limit is already achieved while G901 is active, the velocity of the following block is reached at block end, i.e. then G901 is not effective.
Programing Example

Define acceleration (G08/G09/G900/G901)
Acceleration at block transition in initial state (equiv. to G08).
N10 G01 X500 F400
N20 X900 F1000

Programing Example

Define acceleration (G900/G901)
Deceleration at block transition with G901 and G900
N10 G01 G901 X500 F1000
N20 X900 F400

N10 G01 G900 X500 F1000
N20 X900 F400

Programing Example

Define acceleration (G900/G901)
Combination of G09 with G901 and G900.
N10 G01 G901 X200 F2000
N20 G09 X400 F1600
N30 X600 F1200
N40 G900 X800 F800
N50 X1000 F400
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