On Monday 19 August 2013 22:37:33 Gregg Eshelman did opine: > If you can lay hands on some fine, black monofilament, or whatever it is > that's used in gun scopes, you could make an optical crosshair and skip > the computer generated one. The real crosshair's position isn't going > to wabble about as the camera chenges temperature and it won't be > dependent on the video resolution - as long as the camera has enough > depth of field to focus on both the crosshair and the feature on the > work to which you're aligning. > > A google for eyepiece with crosshair shows that one doesn't have to > resort to pestering black widow spiders. There are hunks of high > quality optical glass with lines carved into them for this sort of use. > ;-) > That might work Greg, but the lifetime of such a setup would be relatively poor since I can move down at .001" to 30" a minute, eventually overpowering the motor at about 160 lbs of downforce. Smunch. And Edmond Scientific gets another order. :( To do actual work it would have to be made to swing out of the way, and that brings up the how do I restore it for micron accuracy when I swing it back down question. How repeatable is the operating position? I think I'd druther just generate the crosshairs & mount the camera solid enough it will absorb the occasional errant wrench or chuck key while changing tools. Good idea on the face of it, not so practical in the real world of flying swarf methinks.
Thanks Greg. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> * Turken thinks little kids are absolutely adorable... especialyy when they're someone elses. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Introducing Performance Central, a new site from SourceForge and AppDynamics. Performance Central is your source for news, insights, analysis and resources for efficient Application Performance Management. Visit us today! http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
