On Thu, 2013-10-24 at 19:27 +0100, andy pugh wrote: > On 24 October 2013 19:00, Tomaz T. <[email protected]> wrote: > > Does anyone here have any experience with chinese motorized rotary stages, > > like this one: > > http://www.alibaba.com/product-gs/615993083/LSDH_100WS_Worm_gear_motorized_rotary.html > > The maximum static torque quoted sounds rather wrong. > > > I'm a bit worried about actual accuracy and amount of backlash. If it would > > be worth of buying it... anyway, is there a way to have actual position > > feedback from table, not only from motor (in case of servo motor) ... I > > mean retrofitting it with a kind of "encoder"? > > All things are possible. Simplest might be a magnetic tape scale > around the outside. > http://www.machine-dro.co.uk/digital-readout-systems/magnetic-linear-encoder-reading-head-25-micron-resolution.html > > Better would be: > http://www.renishaw.com/en/resolute-rotary-angle-absolute-encoder-options--10939 > > But I suspect if you were in that market you wouldn't be looking at > Chinese rotaries. > > If you don't need the through-hole then you could easily hide an > encoder in there. > And a 2500 cpr encoder mounted coaxially would seem to give usable resolution. I've not tried this but have been tempted a few times when using a manually rotated indexer.
Dave ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
