Can you describe the motion of your fourth axis? Linear or radial? If linear, what axis is it parallel to? Ir radial, what axis is its center of rotation parallel to?
Brian On Thu, Sep 16, 2010 at 7:29 PM, Andy Pugh <a...@andypugh.fsnet.co.uk>wrote: > On 15 September 2010 18:24, Spiderdab <77...@tiscali.it> wrote: > > > > hallo, in my inverted tetrapod i've set the 4 axis as: X Y Z A, in this > way: > > > At the moment that seems to be the only way to get 4 working joints, > even on a 3-axis machine like yours. > I tried setting up 3 axes in the INI and 4 joints in the HAL file, but > the axis.3.pos-cmd pins don't change that way. > > There is a plan to change this, and a part-completed emc2 branch > called ja3 which will fix this problem, but it is not ready to be used > yet. > > > but in EMC2 i jog X Y Z with the normal jog speed, then the A with the > > spindle speed. > > This seems very odd. I would expect you to be jogging joints 0,1,2,3 > and they should all jog at the linear jog speed, as they are defined > as linear axes in the ini. > However I have just checked it and you are completely correct. I think > that is a bug. > > > i know EMC2 is not meant for tetrapod, but which is the best way to set > > up axis? > > I think you might have it already, I have so-far failed to come up > with a better setup. > > > i've tryed using XYZU, but i have problems homing. i can home in some > > way (using the menu) but when i change to world mode it says that first > > i've to home all axis. > > You will always need to home the system anyway (the easiest way is > probably with all wires pulled all the way out) otherwise emc will > solve the kinematics wrong as it won't know where it is. > > I have managed to get an XYZU working by creating an [AXIS_6] stanza > identical to [AXIS_3] and defining [TRAJ] AXES=7 and [TRAJ] GEOMETRY=X > Y Z U. > > That does at least get round the issue of having to control joint3 > with the angular speed slider. (which actually disappears then) > > > another question: > > i can jog directly the first three axis, using arrows and pgup/down. how > > can i jog the fourth axis? > > You should be able to press the axis letter and use the + and - > keyboard keys or onscreen buttons. > > -- > atp > > > ------------------------------------------------------------------------------ > 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 > ------------------------------------------------------------------------------ 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
