On Thursday 03 March 2016 10:27:35 sam sokolik wrote: > The z axis on the k&t has the z axis servo mounted on the base of the > machine. The power is transferred to the spinning ball nut through a > linear ball spline and atleast 3 sets of zero backlash gear sets. > (including right angle set) > > http://electronicsam.com/images/KandT/conversion/zaxis/gears1.JPG > > The small set of gears has a spacer between that you grind to take out > the backlash. This take the backlash out of all the gears in the > drive train. > > (it really is pretty impressive - we have the backlash down to about > .0002". ( when we are a bit more energetic - we want to take a bit > more off the washer)) > > sam
You are going to do a new mirror on the K&T, for the hubble that doesn't need bifocals? :) > On 3/3/2016 5:21 AM, andy pugh wrote: > > On 3 March 2016 at 10:00, Gregg Eshelman <g_ala...@yahoo.com> wrote: > >> Herringbone gear - Wikipedia, the free encyclopedia > > > > "Herringbone" isn't a term used in the industry, as far as I know. > > They tend to call them "double helical" > > > > A double helical gear needs one element to have axial float to share > > the load equally. > > > > A double helical rack and pinion with deliberate axial thrust would > > give a backlash-free drive for a router table. > > > > I once saw a large _triple_ helical gearbox at David Brown's (where > > my dad used to work). That's a really stupid idea as the gears can't > > float to equalise load. > > (My dad pointed it out to me with a "They thought that was better in > > 1930, can you tell me why it's a stupid idea?") > > ---------------------------------------------------------------------- >-------- Site24x7 APM Insight: Get Deep Visibility into Application > Performance APM + Mobile APM + RUM: Monitor 3 App instances at just > $35/Month Monitor end-to-end web transactions and take corrective > actions now Troubleshoot faster and improve end-user experience. > Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
