Here’s another idea; take several pictures of your part, each from a different point of view. Use OpenSFM to generate a rough 3D mesh of the part. As a second step, use the 3D mesh to identify your z-distance for final optical measurement.
> On Mar 14, 2021, at 3:23 AM, Mark Johnsen <m...@ijohnsen.com> wrote: > > Any Gelbert videos are like Homer Simpson drooling about bacon... > >> On Sat, Mar 13, 2021 at 9:17 PM Karl Schmidt <k...@lrak.net> wrote: >> >> It isn't hard to get 'A' picture with a USB microscope from China - but >> the problem is getting one that is easily in >> focus - the depth of field is very shallow.. Getting things lit in a way >> to see your 'feature' is another problem. >> >> I have a dark-feild/bright-field microscope with a trinocular camera tube >> - and it still isn't always easy to get a >> great picture of some metal detail.. the special lighting matters - really >> helps if the object is flat. >> >> Mechanical touching might be quicker in a lot of cases.. I saw a camera >> set-up on a lathe where it was focused on the >> tool - so always in focus. >> >> ,.,. >> I have an idea for a touch probe that makes the tool-and machine all part >> of an inductor core (a toroid with a gap) - >> the space between the tool and the part is the air gap - the wire coil can >> be around the colum of the machine (out of >> the way) - the inductance of this coil will change with the air gap - and >> as you touch, the inductance suddenly changes. >> They use such air gaps in power conversion - but here it would just be >> sensed. >> >> I expect that someone has thought of this before and they don't use it due >> to some reason I haven't thought of. >> ,.,. >> >> Gelbart has a LASER jig that can get you close (30-50um).. >> https://youtu.be/otSjut1iGGk?t=140 >> >> he talked about another one with a rotating wireless camera - sub-micron.. >> >> I knew of him when he was involved in making MODEMs suddenly much faster.. >> >> -- >> >> -------------------------------------------------------------------------------- >> Karl Schmidt EMail k...@lrak.net >> 3209 West 9th Street Ph (785) 979-8397 >> Lawrence, KS 66049 >> >> -------------------------------------------------------------------------------- >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
