[HN Gopher] DIY Macro PCB Photography
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DIY Macro PCB Photography
Author : dsalzman
Score : 62 points
Date : 2024-03-17 01:13 UTC (21 hours ago)
(HTM) web link (niemczuk.tech)
(TXT) w3m dump (niemczuk.tech)
| s0rce wrote:
| Labsmore is a commercial option with open source software, >10x
| cheaper than the existing microscope vendors.
| https://www.labsmore.com/
| mk_stjames wrote:
| I want to point out that the Genmitsu 3018 desktop CNC that
| their $4400 microscope is based on is $330 on Amazon. It's hard
| not to recognize.
|
| I think one could assemble the remaining optical path and
| camera for less than the remaining $4070.
|
| Well, I know so, because, I did exactly that several years ago
| with a telecentric lens form Edmunds and a industrial C-mount
| camera back and an even cheaper 3018 CNC for automated
| inspection and archival scanning of PCBs. (telecentric lens due
| to the boards being populated with components, this helps
| capture them without focus stacking and without perspective).
| myself248 wrote:
| I just picked up some Opto-E telecentric lenses with this
| exact idea in mind. (That plus possibly scanning microfiche
| so I don't have to mess with focus.)
|
| If I can do it on a small scale with my long-suffering Ender
| 3 (which keeps getting weirder and weirder stuff stuck to
| it), then transplanting it to a larger motion platform is
| trivial.
|
| What did you do for software?
| anfractuosity wrote:
| Have you come across these type of things
| https://www.aliexpress.com/item/4001351566621.html that
| appear to behave like a metallurgical microscope.
|
| I'm kind of tempted. I assume the objectives aren't infinity
| corrected?
|
| Just found - https://www.youtube.com/watch?v=b_IWTq-TSiU
| which shows something similar. It looks like there's a ring
| that seems to adjust magnification on it, unless I'm
| mistaken.
|
| I've got a DIY XY stage and would like to attach something
| like that too it, to image large objects (I've got a BHM
| microscope but the stage has only a small degree of
| movement).
|
| Edit: Just noticed the objectives used are infinity corrected
| londons_explore wrote:
| What scale is this example?
|
| If those are 5 mil traces with 5 mil spacing, then you might get
| better performance with a simple smartphone camera. The built in
| superresoloution algorithms seem to do a decent job on PCB's.
| ACow_Adonis wrote:
| Yes, I've got the camera bodies, the macro lens, some
| historical experience stitching the pictures together to form
| panoramas, and I've just gotten into microscopy and am pretty
| sure I've got the microscope base he's using too. So I can see
| an alternative universe where I wrote this xD.
|
| One of the first things I thought when I started was "how can I
| get the big camera onto the microscope" and the embarrassing
| conclusion I came to, is if you've got an expensive phone you
| can get cheap plastic adaptors and just attach it to the
| microscope body. Basic stereo microscopes are incredibly cheap
| these days, as are the phone attachments. I use droidcam obs to
| stream video so I don't even have to physically look into the
| microscopes any more. The main thing is going into the phone
| and getting some practice getting everything on manual so phone
| photo software doesn't do funky things.
|
| My use case is slightly different, but the underlying
| principles are the same and I'm pretty sure the microscope
| hardware is identical to that in the post, so rather than
| rigging up a custom attachment to the expensive camera, I just
| rig up the phone camera to the already existent hardware of the
| microscope.
|
| See crab spider for example of one of my earliest tests:
| https://imgur.com/xLS07WY
| sciento wrote:
| What's the magnification that you can get with such a setup?
| ACow_Adonis wrote:
| If you just strap your phone to an actual microscope (see my
| other post), you're basically just limited to the magnification
| that the microscopes achieve. And very good performing
| microscopes are very affordable by hacker news standards these
| days.
|
| Stereo microscope magnifications are typical at about 20x to
| 40x, but I'll commonly go to 640x on the biological one, though
| in practice you bug out at the physical limits of optical
| microscopy just above 1000x.
|
| His specific setup is presumably limited by the magnification
| provided by whatever his objective lens achieves.
| zokier wrote:
| The Hugin output image at the end is pretty rough still :( With
| all that ado, I was hoping to see better final result
| dekhn wrote:
| I take a different approach. I use a 2D stage driven by stepper
| motors and tag each image with the stage position. Then I use
| ImageJ's Grid Stitching plugin using my captured locations.
| This isn't really perfect, but you can also have the plugin
| improve the quality by doing various repairs.
|
| Elsewhere on this thread, some company appears to be re-using
| the 3018 CNC form factor to build inspection microscopes.
| That's a remarkably cost-efficient way to get pretty good
| results in terms of motion. I've also purchased simple 1D
| stages and stacked them get get a full XYZ stage for very
| little money.
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