On Monday, 7 March 2022 15:51:58 EST jeanfrancois wrote: > Somewhere in the region of 5 US mils on a 50x50 mils region. > > I can try work out a solution if you have a budget shall I be > successful in the prototype. > > Regards, Thats pushing a $.50 micro switch according to some, but that is what I'm using on 4 machines, and I can do repeat homes based on the micro-switch to around .0003" inches. I don't know what you are doing, but an ex bro- in-law used to quote that it was good enough for the girls he went with. :o) > > > Jean-François > > Le 07/03/2022 à 21:37, Thaddeus Waldner a écrit : > > I need the small spot size of the measurement. I imagine US is not > > that well defined.> > >> On Mar 7, 2022, at 2:32 PM, jeanfrancois <[email protected]> > >> wrote: > >> > >> Are ultrasonic sensors doing the job in that tolerance ? > >> > >> Jean-François > >> > >> Le 07/03/2022 à 21:01, gene heskett a écrit : > >>> On Monday, 7 March 2022 12:44:21 EST Thaddeus Waldner wrote: > >>>> Hi, > >>>> > >>>> I’m looking for a laser distance sensor with about 1-3 thousandths > >>>> resolution and about a 5-10” working range. I wouldn’t mind buying > >>>> a > >>>> used unit. > >>> > >>> 1. I didn't know they came in that high a resolution w/o needing a > >>> quorum of the US Senate to authorize the payment, then signed by > >>> the President. > >>> > >>> If you want to know why, calculate the time difference of that 3 > >>> thousandths of an inch increment, remembering that it has to travel > >>> out, and back to the measuring device, equal to C/2 in speed. You > >>> will I suspect will come up with a very small fraction of a > >>> picosecond. > >>> > >>> Interferometry can measure that change, but the mod function to > >>> detect > >>> the individual null and count it has to start at zero, or a known > >>> micron sized distance before it can count the nulls passing by as > >>> it moves from zip distance, back to your point of interest at a > >>> 12" max range. Moving slow enough to count, will take a 2048 bit > >>> counter and several days. > >>> > >>> Technically, we can do it but you'll need a couple of dump trucks > >>> full of gold to finance one neasurement. We can't yet buy a > >>> calibrated answer in 10 milliseconds for a $500 bill. Someday? > >>> Maybe, but it may take a new method to be invented. > >>> > >>>> Does anyone here know of some brands/ models to check out? > >>>> > >>>> Google has pointed me at some Acuity products but I wondered if > >>>> there > >>>> were other options besides that. > >>>> > >>>> _______________________________________________ > >>>> Emc-users mailing list > >>>> [email protected] > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>> > >>> Cheers, Gene Heskett. > >> > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
