On 08/07/2013 06:34 PM, Andy Pugh wrote: > > > On 7 Aug 2013, at 23:49, TJoseph Powderly <[email protected]> wrote >> non-linear?, ok >> i read it repeated to same value from origin, but was consistantly off >> at some extreme. >> np. discount bad mounting > > It seems that the sine/cosine signals from the scales do not actually repeat > every 10um. > > This is the guy's YouTube video. > http://www.youtube.com/watch?v=iIdidzAPgBs&sns=em > > What he is comparing is the sine/cosine phase as measured by the > interpolation software, the position as measured by a 0.1um probe and the > distance measured by linuxcnc. The phase should be zero every 10um. It does > not appear to be. > > > ------------------------------------------------------------------------------ > Get 100% visibility into Java/.NET code with AppDynamics Lite! > It's a free troubleshooting tool designed for production. > Get down to code-level detail for bottlenecks, with <2% overhead. > Download for free and get started troubleshooting in minutes. > http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users >
i think the reported values from the IC Haus chip can be looked at with his setup. but the actual sinuses from the Heidenhain scale are _not_ observed by his setup. some interpreted ( interpolated) values are returned from the setup in the video. from the video, i would not infer an error in the sinus, but thats just IMO i would verify the sinus periodicty and i'd ask Heidenhain to check the scale. Can this user hand the encoder over to some local Heidenhain service center? Heidenhain has the ability to prove their certificate's claim They have these tools and are very interested in making sure their products live up to their reputation. the test rig would be something like this... An oscilloscope can show if the sinus is of an even period. A device can move the reader head colinear with the scale. The displacement at a contant velocity should result in a pair of sinuses that are clean and repeatable ( for time, distance and amplitude ) so, please eliminate any suspicion of the scale itself, then, if the scale sinus periodicity is correct, move onto the subsequent electronics (the interface and the IC Haus interpolator ) regards TomP tjtr33 ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
