Live data from Hacker News

Ask HN: What's the coolest physical thing you've made?

news.ycombinator.com

631–640 of 694 posts

Re: Ask HN: What's the coolest physical thing you've made?

#631

I made a baseball bat that uses explosives to add a bunch of energy to your swing and hit a baseball really far. It uses the explosive blanks normally used to shoot nails into concrete (e.g. ramset). It worked way better than I expected, didn't have a kick, and turned out to be just a really neat thing to look at while sipping a frosty beverage. I also made a video about it if you're interested: https://youtu.be/Puo6…

I bet there is a person who is constantly adding engine to bike :)

Re: Ask HN: What's the coolest physical thing you've made?

#632

I made a baseball bat that uses explosives to add a bunch of energy to your swing and hit a baseball really far. It uses the explosive blanks normally used to shoot nails into concrete (e.g. ramset). It worked way better than I expected, didn't have a kick, and turned out to be just a really neat thing to look at while sipping a frosty beverage. I also made a video about it if you're interested: https://youtu.be/Puo6…

I've gotta say, I appreciated how you spent literally 75% of the video explaining all your safety precautions and how they all helped you avoid death, dismemberment, or disfigurement.

Re: Ask HN: What's the coolest physical thing you've made?

#634

Earlier quoted context omitted.

Thank you for asking! The art world is kinda funky.

Very interesting idea. So if I understand it can take abuse, pieces could be ground right off and you would have a different texture but the color would remain, unlike basically anything else where it would revert to the base material color.

I’m not quite sure what you have in mind but it’s not really abusable, it just won’t deteriorate as quickly as other types of painting.

If you cut into it then you may or may not get different colors depending on where you slice. In that sense it’s not much different mechanically than oils, just with way more depth.

Thanks for asking!

Re: Ask HN: What's the coolest physical thing you've made?

#635
post #85

I make a lot of marijuana paraphernalia (stash boxes, rolling trays, pipes) all from wood. Its a great stress reliever (the wood work, not the weed - never mix the two), and people love them and buy them. With each new product, I try to add a new skill to it. So for my stash boxes [1] (I've only made 3 so far -- all prototypes), I have an "air-tight" lid that requires being within 0.001-inches, and the lid incorporat…

I assume that 1/10thou of an inch would disappear into the swelling of a wood product? How do you manage moisture and dimensional changes?

It's 1/thou, not 1/10k. 1/thou is within a couple thou of the maximum difference in expansion.

How I keep my wood from over expanding and shrinking is by using aged woods. My red cedar (what my stash box is made of) was cut down multiple years ago and stored at my grandfathers sawmill, it was then milled 2 years ago to 3/4 rough. I hold them in my shop for over a year before I plane them, then another 6+ months before I use them. All that time, the moisture has stabilized (theoretically), so the only expansion and contraction would be through temperature, which has a much smaller effect than moisture.

I have had some of my wood products expand in shipping, but after a week of them sitting in a person's home, they will be back to normal. That was my vape cart holders. So after a few people said when they arrived they couldn't use them. I started milling them a little looser.

Re: Ask HN: What's the coolest physical thing you've made?

#636
In my old career, I built high speed fluorescence microscopes with lasers and fancy cameras. The scope parts were off the shelf, but the software was mine entirely. So were the firmware tunings for all the outboard equipment! Manufacturers in the 2000s would give you nice technical manuals with "enter at your own risk" appendixes with all the control settings. Was real fun eking out another 20ms~ from a filter wheel with some custom acceleration parameters and balancing. I used Ryan Geiss' milkdrop timing code (http://www.geisswerks.com/ryan/FAQS/timing.html), an absolute gem for Win32 timing quirks.

More recently I've: put an entire exhaust on my car due to manufacturer telling me it would be 2k to replace, rebuilt my garage door frame, reroofed part of my garage, and repointed my historic brick garage wall.

For the repointing, I had to get lime mortar which is rare in the US but here in PA we have a lot of old stone. DeGruchy's NHS to the rescue, color matched and everything. The labor is over the top, but the tools are cheap. I paid for this once and they did it so badly I decided it's simply not worth it. It should last another 50-100y!

Re: Ask HN: What's the coolest physical thing you've made?

#640
post #77

A few years ago I made a "string art" portrait for my girlfriend at the time. It's made from a continuous† 2 km long black thread, woven around a loom made from a bicycle wheel rim. I'm still very proud of how it turned out. †OK fine, it broke at a few points and I had to knot the ends together, but it's the principle that counts. https://imgur.com/gallery/ljoJeal I really wanted to make something creative for her, b…

Gotta say -- that looks ... kinda awesome.

I'm sorry the relationship didn't work out. I can completely relate, though. I think just about every "coolest physical thing" I've made ended up going to an ex-wife or ex-girlfriend.

I guess I'm just not motivated to make cool physical things for myself.

Post reply on HN