On 9 September 2015 at 04:13, Jon Elson <[email protected]> wrote: > Ohhh, that sounds like trouble brewing! I can think of a > high speed spindle running for 8 hours at 20K RPM with a > 1000 count/rev encoder, that gives 9.6 billion counts. > Then, a tool change that needs a spindle orient. Hmm, > maybe a little electrical noise that causes it to pick up a > few extra counts per minute, too. And then it is > mispositioned for the change.
The obvious answer is for you all to follow my lead and use resolvers for your spindle encoders, then there is no danger of accumulated miss-counts. The proposed M19.1 explicit home command could be used if there was a real danger. Thinking further about accuracy, I believe that the position is calculated from a 64-bit accumulator of encoder edges, I think that my previous calculation might have been pessimistic. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
