my only "clue" is that minimal clearance must allow motors to reach optimal values
i think that there should be no worries for the "rotary axis" :
... lathe :
...... S is stared when turret is at safe position
...... M is started same as S, or at least when tool is above the fixtures
... mill :
...... S is stared when tool is at max Z, right after a tool change procedure or
...... S is stared at least when tool is above the fixtures
* this position where rotary axis starts is generally >>> clearance ( much GT clearance ), so no worries here if spindle can accelerate fast
but what about "linear axis" ? i will check if my minimal clearances are enough for my highest cutting specs :
... lathe :
...... highest n * f : 2000 x 0.3 = 600 mm/min
...... clearance of 2.5 will be "vanished" in 2.5 / 600 * 60 = 0.25 seconds
...... note : highest n*f that i used for lathe is 2000x0.6, but this movement did not start with "f 0.6", but with a lower feed "0.2", and feed acceleration was while tool/knife was inside the material; if i would have started with highest feed, than tool may got broken when entering the material; is that "in" & "out" shocks
... mill :
...... highest n * fz * z : 1200 x 0.12 x 14 = 2016 mm/min
...... clearance of 5 will be "vanished" in 5 / 2016 * 60 = 0.15 seconds
...... note : i used 8000 x 0.08 x 14 inside aluminium, but i give up later, because parts were not payed well, and is not ok to go on such high rpm's on BT50