On Jan 22, 2014, at 5:39 PM, Gene Heskett <ghesk...@wdtv.com> wrote:
> On Wednesday 22 January 2014 19:14:34 Jeshua Lacock did opine: > >> Speaking of anti-backlash ballscrews, have you guys seen this printable: >> >> http://www.thingiverse.com/thing:125529 > > That is a cute idea, but you likely have zero real repeatability. And that > IS the name of this game. The only place that would be usable would be > with real servos getting feedback from a linear scale encoder driven by the > table you are moving. That of course adds 300 to 500 USD per axis. Hi Gene, Anecdotally so far repeatability seems perfect. You can see the "virtual threads" marked (by a little oil on the rod). As far as I can tell unless you exceed the pressure and make it slip - it stays perfectly in the "virtual threads"... In any event I am going to do some tests with a dial indicator that I can share here if there is any interest. Also, I am going to place a level across a set of them, place a laser pointer on the level and mark the point on the wall. After moving to and from that point - any angular difference will be greatly exaggerated and should be completely obvious. Cheers, Jeshua Lacock Founder/Engineer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
