That was my doubt, if it was doable because of the linearity problem and also the resolution in such a long distance, since I've worked with LVDTs but only with 1 mm of travel aprox, using them to measure in process the grinding of the camshaft bearings. Anyway this is not a serious project, but a thing to consider in the near future to improve the control on grinders like the one Sven converted to EMC.
The easiest way off course is to buy the linear scale, but if there is a cheap method in wich one can learn and finally have good results it would be awesome. 2012/8/13 Jon Elson <el...@pico-systems.com> > Leonardo Marsaglia wrote: > > Hello Andy. > > > > That's really good news, if one can use a DIY LVDT that would reduce the > > cost drastically. > > > > I've only seen low travel LVDTs intended to be used in diameter measuring > > and things like that. Do you think a 1000 mm LVDT is possible to > accomplish > > without great issues?. > > > Huh? one METER long LVDT? Sure, you could build such a device, but the > resolution > would be a bit better than a mm assuming the magnetics were perfect. > Why would you > try to do this? generally, you can expect to get one part per thousand > easily in analog > electronics, 1 part in 10,000 with substantial difficulty, and anything > beyond that is > getting into the area of insanity. Linear scales of a variety of > techniques are available > for modest sums, with resolution inversely proportional to price. With > these, vastly > greater resolution is much more easily obtained, and linearity is > assured by the > manufacturing process. > > Jon > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
