I have long had a few ideas that could only be implemented on an FPGA. I only have experience with microcontrollers: a whole different world. I tried to learn Verilog and relevant tool chain. I asked a question on the main Verilog forum (it's been a long time - I forgot which), the main guru there snapped "you need to learn the basics first". I thought I had. Needless to say, I was discouraged. Now I see that some progress is being made on this:

digikey.com/en/articles/techzo

My little, but useful, fungus scraper is shown to the left of a petri dish of fungus that could be scraped. This is a sturdier version of the inoculation loop that microbiologists use.

I cut a strip of stainless, shaped it, stuck it into a stainless tube, forced in a little brazing paste (sra-solder.com/soldering-brazi), then torched it. For this little job, a propane torch might have been sufficient.

Brazing is a useful skill. Nobody showed me. I watched videos, bought stuff, then made mistakes.

This container is for use in working with a terrific new material that I am investigating: a mixture of chopped glass, sodium silicate, and water (more on this in a later post). This mix tends to get lumpy when mixed. I like to press out the lumps to create a more homogeneous mixture. This strong, flat-bottomed container will work well for that.

I created the flat-bottomed, straight-walled container from stainless steel. I used a carbide-infused fiberglass cutting disk mounted to a Dremel for both tasks.

All-State 11 FC Nickel-Silver coated brazing rods seemed like just the ticket, but it didn't work. Finally, I called the local Air Gas (where I get my gas cylinders) who sold me Radnor Safety-Silv 56 coated brazing rods. 😀 I used a natural gas-oxygen torch.

Commercial HEPA flow hoods are expensive. I made a small HEPA filter from a catch basin (Lowes Item # 118877), a vacuum bag, wood, adhesive, and a squirrel cage blower.

I used the wood to mount the filter fabric.. The installed finished assembly works great. By that, I mean that the air flow is what I wanted: not too much or too little.

I discovered thi wonderful book when it was only expensive and hardbound. Now the author has made every chapter of the book available in PDF format - FREE! This book is readable, with a minimum of extraneous (not useful to a maker) math. My most recent insight from this book is that, for slow-changing data, a moving-average filter is most suitable. This is easily implemented on most microcontrollers.

The Scientist and Engineer's Guide to Digital Signal Processing

dspguide.com/

A long time ago, I worked on a vaporizer design that would heat air on-the-fly prior to entering a pipe. The four leftmost objects are casting fixtures. The four little round thingies in the middle are cast ceramic shapes. The right two are fully wired to function as (12V) air heaters. The three things on the right are functional vaporizers - pipe not included. The one on the end is what I have used personally for many years.

otto9otto boosted

The center axle of my top was going to be 4 mm. I am trying to keep everything metric. But a 4 mm drill bit in the center hole of my aluminum master part wobbles. Well, my drawing states that all tolerances are +/- .1 mm, and maybe it is within tolerance, but that wobble doesn't make me comfy. Also, upon examination, 4 mm seem a bit slim. So: I am expanding it to 3/16", but I can't drill it on my lathe - too big. Sweating bullets attempting to exactly center the drill on my drill press.

I have a question: when making a drawing of a disk shape for machining, is it sufficient to draw only one-half of a cross section (with dimensions, of course)? Or, should one draw both cross-section halves, but only dimension one of them?

@jmwright Hi Jeremy, can you tell me what happened to my post wherein I told the tale of my final success in producing a workable DXF file via LibreCAD?

A funny thing happened on the way to a working levitating top prototype: Modelling this in FreeCAD led me to the realization that the powerful Nd magnets I am using can be lined up with all poles in the same direction IF they are press-fit into the top structure.

So now that I have the moving part fully drawn (sans magnets), I also realized that I don't have to make the first article by machining. All I need to do is make a mold, which is sort of a 3D version of a photographic negative.

otto9otto boosted

@otto9otto
Mechanical assembles are hard to collaborate on with the current options we have available. I've been involved (marginally) in a couple of projects over the years that aim to allow open hardware collaboration. The latest I've been giving feedback on is STEMN. dev.stemn.com

They're still in beta, but getting close to allowing forking and merging of hardware projects (including mechanical design projects). They're working to improve open hardware file support (FreeCAD) too.

otto9otto boosted
otto9otto boosted

I hate those sites that pop up a page saying, "You're using an adblocker!"

Yea, I know. I installed it because your advertising and the advertising of other sites I visit is out of control. Maybe try to address that problem instead of annoying me more with your stupid complaints about my adblocker.

otto9otto boosted

I'm very glad that @Chocobozzz is working on PeerTube, a federated video hosting platform. I think there is a lot of, if I may put it, thirst, for a photo sharing platform too. With those superficial differences between how Mastodon works and how Instagram works.

And I mean, you could just fork Mastodon and modify the UI. Or you could build on top of ActivityPub from scratch, like PeerTube does. The possibilities are fascinating. All within one network.

otto9otto boosted
otto9otto boosted

Oh, brilliant.

So Windows 10 now has the ability for any application to get system-unique tracking identifiers that persist across reinstalls by storing them in the TPM or UEFI firmware variables...

Look at these APIs: docs.microsoft.com/en-us/uwp/a

To add insult to injury, the APIs lead into clipc!GetOfflineDeviceUniqueID, which calls into a licensing-related service which would be obfuscated by Warbird...

#infosec #tracking

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Makerdon

Makerdon is a Mastodon instance focused on Makers, Open Source Hardware (OSHW) and STEM/STEAM. Free and Open Source Software (FOSS) is a likely topic as well. If you're interested in making things, allowing others to build on your work, and/or teaching others about making things, you might like this instance.