Spindle Start Delay Settings

[adidoro]

My spindle is 24000 rpm and is up to that speed in 10 seconds.

Question: It is possible to set delay start for RPM in percent?

I mean 24000 is 100% in 10 seconds, if speed is set at 6000 rpm which is 25% of max speed, the delay start time to be also 25% from 10 seconds? (Like 2.5 seconds.)
Can I do that with scripting or it has to be done as software implementation?
Thank you.

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[RaraAvis]

The VFD is ramping up the spindle RPM while limiting the current not to exceed the spindle maximum current. There is no guarantee that the spindle speed increases linearly in time.

Also, I would recommend to give 4-5 extra seconds for the VFD/spindle to stabilize the RPM - in the end it is an adaptive process, with the actual RPM "oscillating" around the desired RPM. Do those few seconds matter that much?

[adidoro]

Do those few seconds matter that much?

Yes, in some circumstances...
Thanks.

[adidoro]

Ok, I've found _spindle_delay_start, now I need to think how to use it.

[adidoro]

I found a way but can only use _prog_minspindle or _prog_maxspindle and are not useful anyway when program multiple toolpaths with different spindle speeds.
So I modified my post processor and job done! I will set in PlanetCNC no delay.

Edit: PlanetCNC have many useful scripts but the lack of documentation makes them almost impossible to use.

[PlanetCNC]

Or you you could edit M3 script.
This is where _spindle_delay_start is used.

O<PlanetCNC> if [#<_spindle_delay_start> GT 0]
  G04 P#<_spindle_delay_start>
O<PlanetCNC> endif

[adidoro]

Or you you could edit M3 script.
This is where _spindle_delay_start is used.

I knew this. The problem I had was not knowing how to check spindle command speed before execution to set the delay before execution for every spindle command.

[PlanetCNC]

'_spindlespeed' parameter will get you current 'S' value

[adidoro]

'_spindlespeed' parameter will get you current 'S' value

I knew this to, I don't know what I did yesterday wrong, but today after another quick test it's surprisingly working... (maybe I was tired and made some mistakes)
Thanks for reply's, otherwise I would have abandoned the attempt.

OnStart script @ Line: 0
Start spindle CW
speed=6000 delay=3
Stop spindle
Start spindle CW
speed=12000 delay=6
Stop spindle
Start spindle CW
speed=24000 delay=12
Stop spindle
Start spindle CW
speed=6000 delay=3
Stop spindle
OnEnd script @ Line: 8

[PlanetCNC]

lack of documentation makes them almost impossible to use.

I know documentation can be a lot better but it seems that in this case it was good enough.
You knew everything was needed to do this thing :-)

[adidoro]

Yes, but after searching through manual and scripts to see which does what...
Hopefully will see documentation complete and will be a lot easier.
Thank you.