[HN Gopher] Show HN: CNC Microscopy for Fun
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Show HN: CNC Microscopy for Fun
Author : anfractuosity
Score : 88 points
Date : 2024-09-19 20:59 UTC (1 days ago)
(HTM) web link (www.anfractuosity.com)
(TXT) w3m dump (www.anfractuosity.com)
| alnwlsn wrote:
| Would be really cool to read a whole CD this way. Actually, that
| wouldn't sound any different. You could read an LP though.
| FuriouslyAdrift wrote:
| For vinyl, there's always the laser player (used for
| preservation, too)
|
| https://www.elpj.com/
| anfractuosity wrote:
| I just added an extra image where you can see contours being
| drawn around the 'pits' of the CD-ROM. I need to improve the
| speed of the autofocus etc. before I can image a whole CD heh.
| 2four2 wrote:
| This is basically how an optical CMM (OMM) works. There are
| tricks to determining and calibrating out alignment issues and
| determining snapshot viability, and you're touching on both of
| them. Very well done!
| anfractuosity wrote:
| Thanks, I assume https://en.wikipedia.org/wiki/Coordinate-
| measuring_machine is what you're referring to, which look
| interesting, hadn't come across them before.
| uSoldering wrote:
| If you photograph and stitch a panorama of a CD at a resolution
| with the data visible and distribute it under your copyright, is
| it piracy?
| IncreasePosts wrote:
| Yes.
| shadowpho wrote:
| Piracy is not a technical definition but a legal one.
|
| If you zip/print/scan/ocr/train ML on/restore from ML its still
| piracy even though none of the pixels are directly transferred.
| molticrystal wrote:
| So you wanted to take pictures of cdroms with a microscope, going
| on a decent detour and the other way you can make a microscope
| from a disc player which is a really cool project [0]
|
| [0] "Hacking CD/DVD/Blu-ray for Biosensing"
| https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6066758/
| contingencies wrote:
| I am also just about to attach my microscope to a CNC system, but
| not for taking pictures of two dimensional manufactured objects
| but rather for Z-stacking use in biological light microscopy.
| Probably some horizontal stitching too.
|
| The prompt was that someone gave me a broken project which they
| had never finished (small-scale benchtop CNC system which is
| highly rigid and heavy but had no wiring, an ancient power supply
| and a busted spindle motor). I considered finishing the project
| but the overall size was too small to be very useful for any CNC
| work I would want (we used to have a large scale commercial
| 4-axis!). Therefore I am retrofitting a new control system
| [acquired], rationalizing the power supply [done], and clamping
| on a USB industrial camera based microscope [clamp acquired,
| intermediate mounting plate TBD].
|
| On my current microscope mount it's really annoying to zoom a
| little, take a shot, zoom a little, take a shot since there's a
| high chance of bumping the sample or some slight vibration
| affecting a shot, and it's very hard to move a tiny amount due to
| high-friction macro adjustment interface. I was part-way through
| designing a fix, with some axis modifications for a motor mount,
| but then realised it would be easier to just redesign the mount
| from scratch rather than retrofit a one-off modification. Before
| allocating time to get that done, the CNC fell in to my lap.
| joshu wrote:
| greaseweazle for CDs
| dekhn wrote:
| I started with this but ended up designing my own system around a
| vertical 4040 aluminum extrusion post and various 3d-printed
| components including an XY stage (often costs $10K or more) and a
| Z stage (for focus). It was quite challenging to get everything
| to line up in a single optical axis and keep the dust out but the
| results have been quite good- I wrote my own software after
| trying to get micromanager to work, and can do large acquisitions
| (25x75mm, AKA a single microscope slide) as well as real-time
| object-detector based tracking.
|
| It's remarkably hard to equal or best a $150 scope from Amscope
| in terms of optical quality, it's automating their stages that is
| tricky.
| Animats wrote:
| Nice. Try to image a vinyl record. Maybe someone can write
| something to play such images. The Library of Congress has such a
| system, called IRENE, but it was very expensive.[1] This might be
| a low-cost approach.
|
| [1] https://en.wikipedia.org/wiki/IRENE_(technology)
| ElCapitanMarkla wrote:
| Getting that Z Axis perfectly level across the run is going to be
| fun at this scale.
| anfractuosity wrote:
| Heh yeah, I split the area to be imaged into squares, and run
| autofocus in the middle of the square. Then use a 'snake' like
| XY pattern across that square to create images.
|
| But I need to dramatically increase the speed of this process
| to use across a whole CD etc.
| flimsypremise wrote:
| I'm currently doing something similar to build a photographic
| film scanner. I will say that I've found that moving the optics
| is generally much more error and vibration prone than moving the
| target. I'm actually using a 2 axis microscope stage as the basis
| for my scanner, ironically enough, and CNC spindle z-axis for
| focus.
| anfractuosity wrote:
| Cool, that sounds really interesting, what size film are you
| using that for? Is illuminating the film evenly hard too?
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