Timeline for Does a ball fit in a pipe if they are exactly the same diameter?
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Sep 23 at 20:42 | comment | added | ScottishTapWater | @MarkMorganLloyd - something "fits" in something else, that's not the same as an engineering "fit" | |
| Sep 23 at 19:08 | comment | added | llama | @MarkMorganLloyd someone who knows "fit" as a verb does not necessarily know "fit" as a noun in order to think of searching for it. | |
| Sep 23 at 17:10 | comment | added | Mark Morgan Lloyd | @ChrisH The link I gave shows it (eventually) dropping into position. There's another from the same chap that shows a heated ring around 4' in diameter being nudged into position with a lump hammer: I mention it because the detail that will escape most viewers is that it's sitting on the table of a boring machine, i.e. a vertical lathe of a scale you could have a tea-party in. | |
| Sep 23 at 17:05 | comment | added | Mark Morgan Lloyd | @ScottishTapWater Oh come /on/. The title of the question explicitly asks about /fit/ (and has not been edited to do so), and en.wikipedia.org/wiki/Fit has links to multiple relevant articles. | |
| Sep 23 at 15:40 | comment | added | Chris H | For interest the thermal fitting @MarkMorganLloyd mentions can be tight enough to form a high vacuum seal with no grease or other sealing materials, just smooth metal-to-metal contact (both parts steel but different steels, which matters at this scale; the inner was cooled in a bucket of liquid nitrogen and it still needed hammering into position) | |
| Sep 23 at 14:58 | comment | added | ScottishTapWater | @MarkMorganLloyd - If you don't know the term to google, it might not be so obvious | |
| Sep 23 at 10:06 | comment | added | Mark Morgan Lloyd | @nuggethead My apologies if that sounded a bit ad-hom, but from even a cursory reading of the link I gave you I think you'll grok how rich a field it is. There's /lots/ of stuff on Youtube etc., but I'd give youtube.com/watch?v=U3W3KqB3cJ4 as an example of fitting a chilled bearing into a heated casting: done pretty casually and you can even hear the clink when it drops into place, but once the temperatures have evened out that thing isn't going /anywhere/. | |
| Sep 23 at 9:34 | comment | added | nuggethead | @MarkMorganLloyd indeed I have not! Didn't know the first thing about where to start! | |
| Sep 23 at 8:29 | comment | added | Mark Morgan Lloyd | This is such an extensively studied (and specified) field en.wikipedia.org/wiki/Engineering_fit that I can only conclude that OP hasn't done the minimal amount of preparatory work. | |
| Sep 23 at 0:30 | comment | added | anon | To add to this, in theory you could have a sufficiently small interference between the ball and the shaft that the weight of the ball is enough to provide the required force to press the ball into the pipe. However, the "exact fit" comes from the same universe as the spherical cow and the massless rope. Irregularities in the materials make this impossible, and thermal expansion ensures that even if the materials were perfect, the condition could only exist in a very small temperature range. | |
| Sep 23 at 0:21 | history | edited | Math Keeps Me Busy | CC BY-SA 4.0 |
added 71 characters in body
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| Sep 23 at 0:16 | history | answered | Math Keeps Me Busy | CC BY-SA 4.0 |