This article is within the scope of WikiProject Florida. If you would like to join us, please visit the project page; if you have any questions, please consult the FAQ.FloridaWikipedia:WikiProject FloridaTemplate:WikiProject FloridaFlorida articles
This article is within the scope of WikiProject Metalworking, a collaborative effort to improve the coverage of Metalworking on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MetalworkingWikipedia:WikiProject MetalworkingTemplate:WikiProject MetalworkingMetalworking articles
This article is within the scope of WikiProject Skepticism, a collaborative effort to improve the coverage of science, pseudoscience, pseudohistory and skepticism related articles on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.SkepticismWikipedia:WikiProject SkepticismTemplate:WikiProject SkepticismSkepticism articles
Latest comment: 3 months ago2 comments2 people in discussion
If the ball is made from steel (assuming 7.5kg per liter) why for 10cm radius there's only 10kg?
Mass for 10cm radius is over 31.4kg (4/3*PI*1000*7.5). Ok, maybe ball was empty for some reason but then, how it was made? 87.205.194.100 (talk) 20:11, 28 January 2024 (UTC)Reply
Hollow bearing balls are usually made in halves, and then welded together. A good weld will complete disappear when you polish it, and ball bearings are often pretty heavily polished.
I believe there are also newer processes where the steel can somehow be formed around a plastic core. I don't quite understand how that works. I don't think that would have been available in the 1970s anyway.
The "reason" for making them hollow is, of course, weight. As you point out, large solid steel spheres would be quite heavy, so above a certain size, it's common to make them hollow. ApLundell (talk) 03:54, 29 January 2024 (UTC)Reply
