@CJ-BRAVO said in Change mix ratio without delay?:
can my XYZ and U axis work smoothly without a jerk setting?
Not sure what you mean. If there was no instantaneous speed threshold (otherwise known as jerk), then every move would start from a speed of zero, accelerate up to the demand speed, maintain that speed (if the move is long enough to do so), then decelerate back down to zero speed. When jerk (instantaneous speed change) is applied, one move will slow down to the jerk speed instead of zero, and the next move will commence at that same speed.
So with zero jerk, the gantry will work smoothly but very slowly, especially for things like arcs or curves which are made up from a lot of very short straight moves. Each individual move would start at zero speed, then accelerate but probably never attain the desired speed before it's time to decelerate down to zero speed again prior to the next move. Conversely, if the jerk limit was set to the same as the print speed or higher, then there would be no change in overall carriage speed between moves, but if there is a sharp change in direction, say 90 degrees from pure X to pure Y, then there would be an instantaneous change in speed for each axis, which might be quite violent to watch and not what you would call "smooth".
In summary, the lower the jerk setting, the smoother moves will appear to be, but overal motion might be too slow. Thus the jerk setting will always be a compromise between "smoothness" and print speed.
