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..
--
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Karl Schmidt EMail k...@lrak.net
3209 West 9th Street Ph (785) 979-8397
Lawrence, KS 66049
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