On Tue, 6 Aug 2013, andy pugh wrote: > Date: Tue, 6 Aug 2013 16:25:38 +0100 > From: andy pugh <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: [Emc-users] A puzzler > > I am in discussion with a chap who is retrofiting a Hardinge HXL. It > has linear scales, interpolator boxes set to 256x and is running a > 5i25/7i77 combo. > > The repeatability is good. Actually is is better than good, it returns > to the exact same digit on a 0.1um (0.000004") length probe every > time. > http://youtu.be/2oWc6val6ME > > The problem is that the travel distance isn't accurate. A 50mm move is > out by 0.158mm. The encoder scale is set to 25600 (10um scales, 256 > interpolation). > It doesn't seem like it could be missed encoder counts or the > repeatability wouldn't be so good. > > Any ideas where to look? Bear in mind that this is all done by linear scales. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto
How fast is it going? this may to be close to the limits of the interpolator and the 7I77 at say 100 mm/sec > > ------------------------------------------------------------------------------ > Get your SQL database under version control now! > Version control is standard for application code, but databases havent > caught up. So what steps can you take to put your SQL databases under > version control? Why should you start doing it? Read more to find out. > 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 > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Get your SQL database under version control now! Version control is standard for application code, but databases havent caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out. 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
