A LAB THREW OUT A 100,000 DOLLARS ELECTRON MICROSCOPE. HE TOOK IT HOME AND FIXED IT
A lab gave up on a 100,000 dollars JEOL scanning electron microscope and scrapped it; ProjectsInFlight brought it back to life on a home workbench.
by ProjectsInFlight
ScienceWorkshop
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COMPAREE VERDICT
This is not a weekend project and it is not a from-scratch build. It is a months-long repair of a specific scrapped instrument — a JEOL JSM-5200 scanning electron microscope — that required diagnosing a blown fuse, a shorted transformer, and a dead vacuum pump, then sourcing or fabricating replacements. The video is a documentary, not a tutorial: you watch what went wrong and how he fixed it, but there is no step-by-step guide and no list of parts to order. The promise is different: institutions scrap six-figure lab equipment regularly, and a patient hobbyist with electronics skills, a multimeter, a workshop, and the space to store a 200-pound machine can bring one back. The hardest part is not the repair — it is finding a scrapped SEM in the first place, then having the bench space, the high-voltage safety knowledge, and the months of evenings to work through failures one at a time. If you have never repaired mains-voltage equipment or worked with vacuum systems, this is the wrong first project. If you have, and you have been watching surplus auctions, this video shows what is possible. The one thing most likely to go wrong: you acquire a machine with a failure you cannot diagnose or a part you cannot source, and it stays broken.
IN THE REPO
NOT IN THE REPO
- —This is a rescue story, not a build guide — there are no CAD files, no BOM, no firmware to flash.
- —The 35-minute video is a repair documentary: what broke, how he diagnosed it, what he replaced.
- —No repository exists — this is not an open-source project.
- —The machine itself was free (scrapped), but parts, test equipment, and the space to work on a 200-pound instrument are not.
- —You cannot buy this model new; you acquire one by watching surplus auctions and being ready when a lab upgrades.
- —There is no licence because there is nothing to licence — this is a repair, not a design release.
Can I build this?
Build at your own risk. Projects involve tools, electronics and sometimes mains voltage — follow the creator’s safety notes.
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Videos
Saving an electron microscope from the trash (full repair documentary)35:00
3.1M views; covers the entire rescue from pickup to first image, including fault diagnosis and part replacement
Gallery
Start here
Navigation into the creator’s own docs — we don’t rewrite the guide, we route you to the source.
- 1.Watch the full 35-minute video to understand what you are committing to (This is not a build tutorial — it is a repair documentary; you are watching to learn what can go wrong and how long it takes)
- 2.Read the Hackaday coverage for context on the rescue (Covers the same story with additional links and community discussion)
- 3.Start watching university and lab surplus auctions for scrapped SEMs(The machine was free because the lab had given up on it — you are looking for the same situation, which means months of watching and waiting)
KNOWN ISSUES
- You acquire a machine with a fault you cannot diagnose or a part you cannot source — every SEM is different, and some failures are unrecoverable without manufacturer-specific components that no longer exist.
- You underestimate the space required — these machines weigh hundreds of pounds and need a stable bench, dedicated power, and room to open panels for repair.
- You do not have high-voltage safety experience — the electron gun runs at kilovolts, and the power supply circuitry is lethal; this is not the project to learn on.
- You assume the video is a step-by-step guide — it is a documentary of one specific rescue, not a universal repair manual; your machine will fail differently.
- You miss the time commitment — months of evenings is not an exaggeration, and that assumes you can source parts; some waits are weeks long.
- You pay for a 'non-working' SEM at auction without knowing what is broken — free is the right price for a machine that might be unrecoverable; paying hundreds or thousands for an unknown fault is a gamble.
Can I build a scanning electron microscope from scratch?
No — this is a repair of a scrapped commercial instrument, not a from-scratch build. New SEMs cost $60,000 to over $1,000,000, and no open-source design replicates their performance.
Where do I find a scrapped SEM?
University and lab surplus auctions, directly from labs that are upgrading, or online surplus sites. The key is finding one that is being scrapped (free or near-free) rather than sold as repairable (expensive and often still broken).
What if I cannot find the exact part that failed?
You fabricate a replacement, source a used part from another scrapped unit, or find a modern equivalent — this is the core challenge of the project and the reason it takes months.
Is there radiation risk?
The electron beam itself is contained and shielded, but X-rays are generated during operation — commercial SEMs are designed with shielding and interlocks to prevent exposure. If shielding is damaged or interlocks are bypassed, there is real risk. Do not operate the machine with panels open or shielding removed.
How much does it cost if the microscope is free?
Hundreds to low thousands depending on what fails — replacement vacuum pumps, transformers, and test equipment add up, and you may need machine shop access for custom parts.
Community builds
No community builds yet — be the first, we feature the best ones.
Discussion1
FROM THE COMPAREE TEAM
The vacuum pump alone can cost hundreds used, and you are diagnosing blind until you power it up — what is the one part failure that would make you walk away from a scrapped SEM?
ProjectsInFlight
ProjectsInFlight documents ambitious home workshop rescues and repairs. The JEOL JSM-5200 rescue is the flagship: a scrapped $100,000+ instrument brought back to life over months of patient troubleshooting.
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DISCLAIMER
- Comparee is not the author of the projects featured here. All rights to each project belong to its creator — every page links to the original source, and we never host creators’ files.
- Information is provided without warranty and may become outdated as projects evolve. Prices are indicative bands only — always check the creator’s parts list for current costs.
- Building and operating any project is at your own responsibility. Protective equipment, safe workshop practice and compliance with local regulations are the builder’s responsibility.
CompareeTEAM3d ago
Practical notes from our verification: there is no repository, no build guide, and no parts list — this is a repair documentary, not a project release. The video has 3.1 million views and was covered by Hackaday in December 2024, but it is not a tutorial you can follow step-by-step; every scrapped SEM fails differently. The single biggest barrier is not the repair skill — it is finding a scrapped machine in the first place and having the bench space and patience to work on it for months. If you have been watching surplus auctions and you have high-voltage repair experience, this video shows what is possible. If you have not, it is a documentary of someone else's success, not your weekend.