On Monday 31 July 2017 08:02:54 Reggie Crane wrote: > Have you considered Nexen linear positioning systems? > > http://nexengroup.com/nxn/products/prod-nav/lp/Roller+Pinion+System
That I like. And I'd not be surprised to find that the racks can be butted together to get the effective lengths you would need for a 4x8 working envelop. You would need 2 for that 4' width, you would have more than half of the 2nd in the cutoff, which would serve as the last extension filler for the 8' needed the long way. Thats 4 for the 4', and 4 for the 8' run using the leftovers from the 4'. 8 racks total. My $0.02. :) > On Mon, Jul 31, 2017 at 6:53 AM, andy pugh <bodge...@gmail.com> wrote: > > On 31 July 2017 at 12:13, Tomaz T. <tomaz_...@hotmail.com> wrote: > > > For my future project (cnc router) I will have to use helical rack > > > and > > > > pinion system on two longer axis (2 and 3.5m). There are some > > designs where pinion is forced against rack with spring tensioner > > > > It ocurred to me a while ago that if using a double-helical rack and > > pinion then you can achieve zero backlash with an axial displacement > > of the pinion/gear relative to the rack. > > I don't know if anyone has ever done that. > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." > > — George Fitch, Atlanta Constitution Newspaper, 1916 Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
