On 10/24/2013 06:50 PM, Tomaz T. wrote: > This one has a bit more specs about accuracy... if I could trust them :I > http://bjwn.en.alibaba.com/product/215200677-200438444/Motorized_Rotation_Stage.html > On this rotary stage sizes is usually nema 17 frame size, so with 1:180 ratio > I could expect minimum 40Nm of torque?Isn't usually there a "mechanism" that > allows to tighten worm against worm wheel to reduce backlash? >
some worms are in eccentric sleeve that, when turned, increases pressure on ring gear. some worms were split at the meet ( ng ), and turning one would reduce lash. some have 2 worms, one on each side of ring and are driven/sprung to reduce backlash. but, simply carefully slowly turning the worm to rotate a full axis rev will reveal a lot. i've used a dc servo, lab p/s with a vmeter AND an ammeter. hi/tight spots can be seen fairly easily. turn at the slowest rpm you can do steadily, observe the current. regards tomp tjtr33 ------------------------------------------------------------------------------ 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
