On 10 September 2010 14:55, Spiderdab <77...@tiscali.it> wrote: >> Why do you have this requirement? With a bit more detail we might be >> able to find a way to do what you want.
> I've done an inverted tetrapod. Just for artistic purpose. I need to > make a Volley-ball fly in 3D, and the emc software, with 4 stepper > motors is quite perfect (and economic!!) for this project. > but i need this time and others, that accel and decel would change > during movements. for example one time the ball (or a fly, or other > bullshits..) should accelerate smoothly, sometimes must do a rapid movement. For a one-off you should be able to get the right effect with small moves at varying speeds, I think. It would be painful for a production machine, but might be enough for you. G1 x1 y1 z1 F100 G1 x2 y2 z2 F200 etc. The alternative would be to do it either with a custom kinematics module which does have an accel pin (and then stretch the following error limits to suit) or perhaps a HAL module (written in comp) that takes X,Y,Z demands and passes them on to the stepgens after modifying for acceleration (and maybe jerk?). It would need to pass the position-fb back to the motion planner with the modifications removed to make f-error work. This presupposes that there isn't already an input to the trajectory planner, of course, I have never bothered to investigate where the accelleration in the INI file gets into the trajectory planner. -- atp ------------------------------------------------------------------------------ Automate Storage Tiering Simply Optimize IT performance and efficiency through flexible, powerful, automated storage tiering capabilities. View this brief to learn how you can reduce costs and improve performance. http://p.sf.net/sfu/dell-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
