On 12/22/2015 12:25 PM, Chris Morley wrote: > jerk limiting allows one to define a machine command that > the machine can actually physically perform. In fact it > can allow you to raise acceleration setting giving you > more performance. Yes, I see your point! Actually, what I was referring to was during the spindle reversal. Especially on a lathe, due to the inertia of the chuck, violent reversals of the spindle are actually impossible. So, the spindle's rotational inertia makes jerk MECHANICALLY impossible.
So, the only place there could be jerk is when the Z axis first slaves to the spindle. This can lead to sudden accelerations, but LinuxCNC seems to be fairly well behaved in this condition. But, of course, the whole problem with spindle-synched motion is that the motion CAN'T be pre-computed, it has to be forced to line up with the spindle index in real time. That makes things just a bit more complicated. Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
