I know that the big commercial machine I interacted with at my previous job would run over diamond plate and run it's head up and down to maintain the distance from the surface without actually touching the surface. I'm guessing it had to do with it's current/voltage sensing feedback. I did not follow the THC module that the guys here were working on years ago, I'd bet those threads have alot of info regarding the subject, how it works and how to implement it. I would think that just riding the surface on a floating head would be rather stressful to the mechanisms involved. Then again I doubt you'll want your machine to be running every possible second it can, 10 hours a day 5 days a week.
Jim On Sat, Nov 10, 2012 at 1:20 AM, Marius Liebenberg <mar...@mastercut.co.za>wrote: > I dont think your idea is a good practical idee for a production > machine. The torch does touch off thousands of times and the loose nuts > will wear out in no time. There is nothing wrong with a well designed > floating head and in my opinion it is the best possible pactise to date. > I do call out service to cnc machines as part of my income and most of > the problems that I attend to re badly designed or built mechanics on > machines. Sometimes the electronics are not good but mostly mechanics. > I will leave you with his idee - Because a thing works once does not > mean it will work well forever. > > > On 2012/11/10 02:51 AM, Tom Easterday wrote: > > 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 La-cis 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 > > > > > > -- > Regards / Groete > > Marius D. Liebenberg > MasterCut cc > Cel: +27 82 698 3251 > Tel: +27 12 743 6064 > Fax: +27 86 551 8029 > Skype: marius_d.liebenberg > Skype Me^(TM)! <skype:marius_d.liebenberg?call> > Get Skype <http://www.skype.com/go/download> and call me for free. > > > > > --- > avast! Antivirus: Outbound message clean. > Virus Database (VPS): 121109-0, 2012/11/09 > Tested on: 2012/11/10 08:20:54 AM > avast! - copyright (c) 1988-2012 AVAST Software. > http://www.avast.com > > > > ------------------------------------------------------------------------------ > Everyone hates slow websites. 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