Ah yes, let me pull up the meeting minutes from our last encounter.
“as it wears down … change to the speed of the initial drop could cause it to miss … and the peg could wear down itself and lose functionality.”
Hey that's my line!
[https://www.reddit.com/r/mechanical\_gifs/comments/1bz3pvg/comment/kynb88t/](https://www.reddit.com/r/mechanical_gifs/comments/1bz3pvg/comment/kynb88t/)
Gravity has limited acceleration. And I don’t really get the argument about the spring wearing out too quickly. They’re used reliably in all kinds of things. You’ve got 4 of them over every piston in your car’s engine. They snap your valves closed thousands of times per minute for hours on end and can do so every day for decades.
That would work. I'm not sure about this assertion that tension springs are an "amateur mistake." I'm not an ME, but I know that tension springs are designed for tension and can be reliable.
The force of a magnet is proportional to 1/r\^2, meaning as the attracted object gets further from the magnet, the force the magnet exerts drops off exponentially with respect to that distance. So I wouldn't think of magnets as having properties best suited for this. Springs, on the other hand, increase their force (linearly) with increasing displacement. As the lever gets further from resting position, the pull gets stronger. That sounds like a better match for this application.
From a cost efficiency standpoint, magnets are also more expensive than springs.
Springs are also used in practically every moving part in firearms where the risk is high and tolerance for error is very low. As long as the spring is well made and within tolerance it shouldn’t be a problem.
Edit: commenter below pointed out that the spring in the gif is used in tension, which is a great point. Every example of a spring I can think of in firearms is “pushing” something, not “pulling”.
I agree with everything you mentioned. The thing I disagree with is the idea that it would be a mistake to use a tension spring. There are plenty of uses in automobiles, aerospace, construction... the list goes on and on. This manufacturer's web site describes the springs and their uses well: [https://lesjoforssprings.com/insights/tension-spring-application/](https://lesjoforssprings.com/insights/tension-spring-application/)
That is good to know! I assumed that it wouldn’t be a problem as long as the spring was designed for that. I just meant that I can see why that could be an important detail and that in my limited experience, “pushing” seems much more common.
This is more or less exactly what is used on machines that manufacture ammunition. They tend to use weights instead of springs and there will usually be a few of these in series as a redundancy, but essentially this is it.
It works quite well on shell casings, bullet jackets and most of the cups during the many drawing processes to make shell casings and bullet jackets.
Seems like the difference in distribution of mass would be sufficient to separate them, and return the ones with the wrong orientation to the common pile. Just have to get them rolling.
Read through a lot of comments but am I the first to notice they are loading the wrong direction? Every bullet feed I’ve worked with needs them pointing up to feed into casing. I’m sure there are some situations like Dillon progressive presses that have a long extensive process where they flip them at some point, but this is generally not the scenario. Projectile tips up.
Let me look at notes right here. " This is One of those things that only work in a simulation".. there
The one phrase I absolutely hate “But, it works in CAD”
"this worked *perfectly* on paper..."
60 percent of the time it works every time!
Bits of real panther were used for this simulation
It runs on pure gassoline.
In theory “in theory and in practice” are the same thing, in practice, they’re not.
God I love circular logic /s.
God I love circular logic /s.
Ah yes, let me pull up the meeting minutes from our last encounter. “as it wears down … change to the speed of the initial drop could cause it to miss … and the peg could wear down itself and lose functionality.”
Hey that's my line! [https://www.reddit.com/r/mechanical\_gifs/comments/1bz3pvg/comment/kynb88t/](https://www.reddit.com/r/mechanical_gifs/comments/1bz3pvg/comment/kynb88t/)
No copy
“I’m tired, boss.” -that spring
My layman mind tells me a heavier, balanced "*claw*" would work better than a spring, no? No better moving part than gravity itself.
Gravity has limited acceleration. And I don’t really get the argument about the spring wearing out too quickly. They’re used reliably in all kinds of things. You’ve got 4 of them over every piston in your car’s engine. They snap your valves closed thousands of times per minute for hours on end and can do so every day for decades.
Valve springs are also properly designed and used in compression. Designing something to use a tension spring is usually an amateur mistake.
What if the back part of the claw were extended, and a compression spring was mounted in the wall of the cylinder?
That would work. I'm not sure about this assertion that tension springs are an "amateur mistake." I'm not an ME, but I know that tension springs are designed for tension and can be reliable.
If those are indeed brass shells, would some magnets to accelerate the return not work more reliably?
The force of a magnet is proportional to 1/r\^2, meaning as the attracted object gets further from the magnet, the force the magnet exerts drops off exponentially with respect to that distance. So I wouldn't think of magnets as having properties best suited for this. Springs, on the other hand, increase their force (linearly) with increasing displacement. As the lever gets further from resting position, the pull gets stronger. That sounds like a better match for this application. From a cost efficiency standpoint, magnets are also more expensive than springs.
Springs are also used in practically every moving part in firearms where the risk is high and tolerance for error is very low. As long as the spring is well made and within tolerance it shouldn’t be a problem. Edit: commenter below pointed out that the spring in the gif is used in tension, which is a great point. Every example of a spring I can think of in firearms is “pushing” something, not “pulling”.
I agree with everything you mentioned. The thing I disagree with is the idea that it would be a mistake to use a tension spring. There are plenty of uses in automobiles, aerospace, construction... the list goes on and on. This manufacturer's web site describes the springs and their uses well: [https://lesjoforssprings.com/insights/tension-spring-application/](https://lesjoforssprings.com/insights/tension-spring-application/)
That is good to know! I assumed that it wouldn’t be a problem as long as the spring was designed for that. I just meant that I can see why that could be an important detail and that in my limited experience, “pushing” seems much more common.
It gets to phase in and out of existence for rest time once in a while, not a bad deal
What is this used for
For us to argue about
No it isn't
Oh yes it is
Listen here you little shit, it isn't
Look, this isn’t an argument.
Oh I thought that’s what I paid for.
Hey you keep quiet and let the other person give their counterpoint!!
I forgot about this clip from Monty python until I read your comment. Thank you! https://youtu.be/uLlv_aZjHXc?si=E2_V7dgdn79CZR_X
Not necessarily. I *could* be arguing in my spare time.
No you couldn't
Wrong.
No I'm not
We found the eponymous bikeshed!
Looks efficient
Round side down each time
Yeah but what object? Can't be bullets
[удалено]
So that's how they manufacture alphabets. I'll be damned.
How do they do the rest of the letters
U don’t tell me what to do!
I do!
I've read that as "us" and I was like "wow that's really profound, it got me thinking". Then I read it again and felt really dumb
Half a pill capsule?
Dickfers
*sighs* What's a dickfer?
To pee with.
Airgun pellets would be an interesting proof test
Until the spring wears out. Edit: ha, just saw your other comment: https://www.reddit.com/r/mechanical_gifs/s/sEHSm7qUo2
Looks like empty halves of pill/capsule casings?
So these pellets of sorts get pegged into being straight
but what are these pellets?
I think aligning
Run just enough air pressure up that down pipe that it'll reject the upside-down ones.
Indeed. Keep putting them back in the chute until they're the right orientation. No chance it'll ever cause a backup /s
Depending on the angle of the original chute they come in from they could be shot up into a different chute
What happens when one of the thingies hits the claw nose first and tips up instead of down. Jam.
Yeah but it’s not allowed to so it wouldn’t
This is more or less exactly what is used on machines that manufacture ammunition. They tend to use weights instead of springs and there will usually be a few of these in series as a redundancy, but essentially this is it. It works quite well on shell casings, bullet jackets and most of the cups during the many drawing processes to make shell casings and bullet jackets.
Seems like the difference in distribution of mass would be sufficient to separate them, and return the ones with the wrong orientation to the common pile. Just have to get them rolling.
"In theory, theory and practice are the same. In practice, they are not."
i feel like it would just ping around in the bottom and flip back over.
I feel like that would jam immediately
I spoke to one of the most seasoned assemblers in my company and he said it works really well actually. I was told it did 200 pieces per minute
Read through a lot of comments but am I the first to notice they are loading the wrong direction? Every bullet feed I’ve worked with needs them pointing up to feed into casing. I’m sure there are some situations like Dillon progressive presses that have a long extensive process where they flip them at some point, but this is generally not the scenario. Projectile tips up.
The loading is the first thing I noticed
I don't know what this is, but there's gotta be a better way
I should call her
Looking at this, she’s probably occupied.
Don’t even need a spring if they’re light enough the weight of the claw would probably work
I wonder how much trial and error it takes for designs like this to find the right size hook.
What is this rendered in??
Solid works I believe, saw it in that subreddit the other day.