Thanks, Dave. I'll have to learn more about laser tracking systems. The system will be housed in a well insulated, temperature controlled building. Ideally, temperature won't vary more than set point +/- 4 degrees F.
Also, positioning accuracy +/- 1/8 inch seems like it should accommodate thermal expansion/contraction. > On Aug 22, 2017, at 9:17 PM, Dave Cole <linuxcncro...@gmail.com> wrote: > > Several years ago I worked on a quote for a job of similar size but the > accuracy had to be much better. I think it had to be plus or minus 0.010 > inches or so over the entire 3D space. > A 3D laser tracker was part of the control scheme to track the actual tool > head location. > That way standard rack could be used for the positioning mechanism and the > position could be corrected on the fly via the laser tracker. > The machine was a big router used to make parts for modern battleships which > are constructed of composites. > The router was going to be constructed as part of a building that was > temperature controlled to minimize the effects of temperature changes. > The DOD killed the contract and the entire project went away. > Without some type of correction, you are going to have to deal with > temperature expansion/contraction issues which can be considerable over 150 > ft. > > > > >> On 8/22/2017 8:37 PM, Rick Gresham wrote: >> Hmmm, interesting but there's guys already working on that. No, different >> application but with some similarities - placing a calculated amount of a >> fluid at a specific point or range of points in a 3D space. >> >> >>>> On Aug 22, 2017, at 5:02 PM, Gene Heskett <ghesk...@shentel.net> wrote: >>>> >>>> On Tuesday 22 August 2017 13:01:01 Rick Gresham wrote: >>>> >>>> I'm exploring options for a 3 axis controller similar in some ways to >>>> typical cnc router-like application. What may make my application >>>> unique is the size of the 3D space in which the tool operates: up to >>>> about 150' x 150' x 50'. In addition, I need to control tool changes >>>> and calculate/control fluid flow rates based on calculations applied >>>> to retrieved persistent data. >>>> >>>> Does this sound like something LinuxCNC can handle? >>>> >>> If you can build the hardware, linuxcnc can likely control it. >>> >>> Sounds like you want to cast buildings with high slump concrete? In this >>> case I am sure that linuxcnc's ultimate accuracy will match, or with >>> suitabe screw compensation, handily beat the elasticity of the support >>> framework you can still knock down and move on a public road with >>> permits, 56 wheels and escorts. :) >>> >>>> Private replies welcome. >>>> >>>> Thank you. >>>> >>>> Rick Gresham >>>> Portland, OR >>>> >>>> >>>> ---------------------------- ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
