Perhaps a drawing or something? I am not following what you are proposing. Sounds like you are talking about having a set up where the z-axis ball nut (and hence the whole z-axis) is "sloppy" and can move 10-15mm up/down? While it might work (if that is what you are describing) then won't there be a lot of slop in the actual movements of the whole axis and won't that effect other movements such as adjustments in response to the THC during cutting? Or perhaps I totally misunderstand what you are saying.... Tom
On Nov 9, 2012, at 5:42 PM, Viesturs Lācis wrote: > Hello! > > Little too late but still - I suddenly realized that I need some > provisions for something similar to floating head for plasma torch. > I would like to ask plasma table owners to share their experience, how > they have solved the following issue: > Hypertherm (and most probably other manufacturers' as well) plasma > sources have a signal for cnc controller, when torch has touched the > material, which is used to probe the material surface and then retract > to pierce height. Since decelerating the plasma torch from the moment, > when touch is sensed, takes some time and distance of travel, some > provisions for that extra travel are needed. > > I have seen lots of videos on Youtube with floating torches, but there > are 2 things that keep me reserved about them: > 1) vast majority of them are not used with LinuxCNC > 2) they require additional construction - bearings etc that I would like to > skip > > So the question is - how do other plasma table owners feel about my > superior invention of non-fixed fixture of Z axis ballscrew nut: > The basic concept is something like this - motor and ballscrew is > attached to Z axis, ballscrew nut is attached to Y axis. And I thought > that I could leave the screws, holding the ballscrew nut in place, > turned (sorry, I do not know the correct word for that) so that they > allow for something like 10 mm free travel of nut to accommodate the > deceleration distance. What I mean here is to have the Z axis balscrew > nut to lay on its support plate, have screws in place that do not > allow it to rotate, but that allow it to move extra 10-15 mm for the > situations, when torch has touched material and is not supposed to > move further in -Z direction. > > The question is - has anyone ever attempted something similar and are > there any potential issues that I am running into? I am not sure that > the nut will be so eager to slide along those screws and that the > whole concept would generally fail... > > -- > Viesturs > > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_d2d_nov > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
