Il 10/09/2010 16:09, Andy Pugh ha scritto: > 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. > > I really don't know about this kind of modifications in kinematics, so waiting for experts and developers to say if it's possible or not.
about the idea of writing down little steps to draw my own ramp, for now it could be an alternative and may give a quite good result. of course will be a pain to write down, but it's possible. thanks guys for suggestions, waiting for developers answering! ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
