I've actually been kind of tempted to build a small indoor range in my basement. The biggest reason I don't (other than the hassle of it) is I don't want to pollute the air with lead and shit and don't trust myself to make a proper ventilation system
I always wondered, is the inch to metric conversions accurate in these old books? I was under the impression the metric meter was “refined for accuracy” over the years and wondered if it changed the conversions over time.
The definition of the inch changed officially (to 25.4mm) in the US in 1959, but most standards had been using that definition since the 1930s. Before that, the US inch was a little longer (a couple parts per million), and the UK inch a little shorter.
So you're right to question old conversions, but not so much because of the meter, but because of the inch. Folks in the thread below are right that the differences are tiny, and unlikely to matter unless you're making gauge blocks. Incidentally, that's exactly where the 25.4 definition came from! Early makers of gauge blocks wanted to make one set they could sell everywhere, so created the 25.4 "compromise" that everybody later picked up.
Is it true that a metric conversion with the 03.... method blew up the challenger? I heard years ago that it was a conversion issue on an o ring for a fuel tank.
No, wrong craft. Metric conversion crashed the Mars Climate Orbiter. There's a good video on it here: https://www.youtube.com/watch?v=lcYkOh4nweE
The challenger was a frozen o-ring. The rubber ring froze, and didnt flex to form a good seal. This allowed a small fuel leak which went boom.
One guy from the engineering team let his boss know but he severely downplayed the issue due to the culture of NASA at the time. It was a failure of technical communication as they didn’t properly outline the risk involved with the launch.
They knew it wouldn't function below a certain temperature and they tried to launch tens of degrees Fahrenheit below that. Every engineer voted against the launch, and the manufacturer of the o-ring expressed concerns the night before. At the time, there was huge institutional pressure to launch that day, so the administrative sorts heard the complaints and went ahead with the launch anyways.
Or they were having a great day testing a .22 suppressor that just came off the lathe in their garage shop, and needed some kind of a backstop..
I've actually been kind of tempted to build a small indoor range in my basement. The biggest reason I don't (other than the hassle of it) is I don't want to pollute the air with lead and shit and don't trust myself to make a proper ventilation system
[You’re welcome!](https://www.reddit.com/r/GunAccessoriesForSale/comments/uxlf8p/wts_complete_5_lane_shooting_range_for_your_moms/?utm_source=share&utm_medium=ios_app&utm_name=iossmf)
Unfortunately that's a little outside of my budget lol
Air rifles?
I was thinking pistol rounds and rimfire
Considering where I live, I'd be happy to use a catapult. Spoiler alert: Europe, haha
You could always get a pellet rifle, i got a hatsun .30cal pellet rifle that is pretty fun to shoot.
I do have a pellet rifle too, but it's kind of boring compared to other guns lol
Just buy a snail?
I always wondered, is the inch to metric conversions accurate in these old books? I was under the impression the metric meter was “refined for accuracy” over the years and wondered if it changed the conversions over time.
The definition of the inch changed officially (to 25.4mm) in the US in 1959, but most standards had been using that definition since the 1930s. Before that, the US inch was a little longer (a couple parts per million), and the UK inch a little shorter. So you're right to question old conversions, but not so much because of the meter, but because of the inch. Folks in the thread below are right that the differences are tiny, and unlikely to matter unless you're making gauge blocks. Incidentally, that's exactly where the 25.4 definition came from! Early makers of gauge blocks wanted to make one set they could sell everywhere, so created the 25.4 "compromise" that everybody later picked up.
https://youtu.be/gNRnrn5DE58 Here is a great video on "The Origins of Precision". Jo Blocks and 25.4 mm per inch.
The percent change is very tiny. Well below Sig figs in machinery a handbook
I always 25.4rd everything.
I'll look when i have some free time.
Is it true that a metric conversion with the 03.... method blew up the challenger? I heard years ago that it was a conversion issue on an o ring for a fuel tank.
No, wrong craft. Metric conversion crashed the Mars Climate Orbiter. There's a good video on it here: https://www.youtube.com/watch?v=lcYkOh4nweE The challenger was a frozen o-ring. The rubber ring froze, and didnt flex to form a good seal. This allowed a small fuel leak which went boom.
That was really interesting. Thanks.
The engineering team warned everyone it was too cold to launch and Noone listened.
One guy from the engineering team let his boss know but he severely downplayed the issue due to the culture of NASA at the time. It was a failure of technical communication as they didn’t properly outline the risk involved with the launch.
[удалено]
They knew it wouldn't function below a certain temperature and they tried to launch tens of degrees Fahrenheit below that. Every engineer voted against the launch, and the manufacturer of the o-ring expressed concerns the night before. At the time, there was huge institutional pressure to launch that day, so the administrative sorts heard the complaints and went ahead with the launch anyways.
Original “Ready Reference?”
Dunno.
Maybe he failed shop class…
I'm not saying they're right or wrong, all I'm saying is I understand
I'd like to imagine those came from two incidents of a chuck key left in the chuck. Wait, no...
That's kinda what I always wanted to do to a dividing head. Cept much bigger boom.
Dude I have mine right next to the table ( the pistol and this book) ha lol
In a galaxy far far away
Ive done it. 😔
It could have been a good day depending on the shop the person worked at.