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 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
