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. 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