Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 



Forgot your password?
typodupeerror

Comment: Re:My sockets are made of high quality steel (Score 1) 77

by NormalVisual (#48646235) Attached to: NASA 'Emails' a Socket Wrench To the ISS
Wouldn't an impact wrench have been a more appropriate tool in that case?

Yes it would, but I didn't have one available at the time.

Or a regular wrench + a good number of firm taps with a hammer?

Tried that before breaking out the jack.

An 18" lever and floor jack sounds like a good recipe to break off a frozen bolt.

Yeah, it is a lot of times. After the first attempt, I let it sit for a couple of days with penetrating oil on it, and I had the drill ready to go if things went south. I was frankly surprised that the bolt *didn't* break, and even more surprised that the threads were perfectly clean, with just a little bit of blue Loctite on them.

Comment: Re:My sockets are made of high quality steel (Score 1) 77

by NormalVisual (#48646155) Attached to: NASA 'Emails' a Socket Wrench To the ISS
Those parts are bigger than the output. The highest force is applied to the output, not the ratcheting mechanism, because the output is of lesser diameter.

That's assuming that the fastener is the smallest element in the system, and things get worse very quickly when the fastener is substantially bigger than the drive. In my particular case, it was a 1/2" drive on an 18mm socket, and it was the drive that broke. The size of the ratchet head was about an inch, so I'm guessing the ratchet itself was also around 18mm. Ratchet survived, but was kinda useless without the drive, and it wasn't worth it to open the wrench up and replace it. :-)

Having said that, I hadn't thought about grossly oversized ratchets/drives in conjunction with small fasteners. If you're turning a 1/2" bolt using a Hulk-like plastic ratchet with a 1" drive, you will have a lot more mechanical advantage to work with.

Comment: Re:My sockets are made of high quality steel (Score 1) 77

by NormalVisual (#48646115) Attached to: NASA 'Emails' a Socket Wrench To the ISS
If a finer part of the tool survived but a thicker broke, doesn't it seem very plausible that the tool was either badly designed or that the manufacturer have problems in their molding process.

I guarantee that was the case (although steel hand tools are generally forged, not molded) - it's not like I was using a high-end Snap-On wrench. Just the same, the crappiest steel tool is going to be stronger than any ABS tool of comparable dimensions.

You are talking about managing to break a hand powered tool. With a good design that have been correctly manufactured that shouldn't be possible. Plastic or steel, it is perfectly possible to create ratchets strong enough that your arm will break before the tool.

I also mentioned that the bolt was tight enough to require a floor jack to get enough torque on it, so it was under far more torque than any person could apply. That *still* should not have been adequate to break the drive, but it did. It's possible to make very strong ratchets with a variety of plastics in a size readily usable as a hand tool, but neither ABS nor PLA is one of them

Comment: Re:My sockets are made of high quality steel (Score 1) 77

by NormalVisual (#48646089) Attached to: NASA 'Emails' a Socket Wrench To the ISS
3d printers are working in metals now. Carbon fiber as well.

The one in question doesn't, so this statement is irrelevant to the discussion.

I don't know how to deal with someone with so little vision that they can't understand the value of fabricating tools on site when the alternative costs thousands of dollars a pound and has turn-around measured in months.

Spend as much time as I have in tool manufacturing facilities and working with engineers to optimize production processes (including 3D sintering, which already was old news 10 years ago), and then once you've done that, go back and read the original post and explain where "little vision" comes from. I said nothing regarding 3D prototyping/manufacturing in general, but you'd know that if you actually read what I wrote.

" So I'd ask you to just stay away from the Internet."

Says the AC. Whatever, dude.

Comment: Re:My sockets are made of high quality steel (Score 1) 77

by NormalVisual (#48645861) Attached to: NASA 'Emails' a Socket Wrench To the ISS
It certainly doesn't sound like it when you jump to the conclusion that the largest and sturdiest part of a tool would fail before the fine tool end that contacts the nut.

I'm not an M.E., but I've seen enough drives/ratchets break with intact sockets (and no, they weren't impact sockets) to know that one can't make that statement categorically.

Comment: Re:My sockets are made of high quality steel (Score 1) 77

by NormalVisual (#48645783) Attached to: NASA 'Emails' a Socket Wrench To the ISS
It's not a contrived (that means "unlikely and made up for the purposes of the argument", BTW) example - it actually did happen, and happens more often than you might think. Just because a good portion of the ISS was built under ideal conditions doesn't mean that fasteners can't stick. There are parts that have been in space for more than 15 years, after all.

But to respond to your statement directly, no, a metal socket isn't going to help the first bit when the drive, ratchet, or handle is made of a flimsy plastic like ABS or PLA, even if it's injection molded. If the fastener is hard enough to turn that it breaks an ABS socket, then it's going to break the wrench instead when you use a steel socket on it.

Comment: Re:My sockets are made of high quality steel (Score 2) 77

by NormalVisual (#48645599) Attached to: NASA 'Emails' a Socket Wrench To the ISS
If you attach a metal socket, it's probably quite capable.

I wouldn't expect a lot. I snapped the solid steel drive on a 1/2" ratchet right off the last time I did my brakes trying to get a frozen caliper bolt out . It took an 18" breaker bar with a 3/4" drive in combination with a floor jack to get enough torque on the breaker bar to finally get the bolt loose. I don't foresee an ABS tool handling that kind of stress.

Comment: Re:Revolution (Score 1) 448

by shutdown -p now (#48645553) Attached to: What Happens To Society When Robots Replace Workers?

But the rich will not recognize that until the mobs with pitchforks are breaking into their gated communities.

It only needs to happen in one place for others to recognize the urgency. Just like the communist revolution in the USSR prompted the rise of the welfare state in the West (and, with the collapse of the USSR, welfare state is also slowly evaporating).

What this country needs is a dime that will buy a good five-cent bagel.

Working...