On 2/17/2020 9:23 PM, James Waldby wrote:
I noticed some annoying bait-and-switch in the article https://

http://www.popularmechanics.com/scie...object-vacuum-
friction/.

The first paragraph talks about balls of silicon dioxide that rotate
300 billion times per second, which would be 1.8 trillion RPM.
Imagine my dismay at finding out, a couple of paragraphs later,
that the author had mixed up RPS and RPM; the particles actually
are spinning at only 5 GHz (5 billion RPS), or 300 billion RPM.

Dang-it... and I was fantasizing about swapping out the 24K Spindle on
the machine I primarily use for engraving to a measly 60K spindle. Now
my plan is all shot to heck. My brains is going 1.8 trillion miles a
second dreaming about a 300 billion RPM spindle. 4 minute engraving
jobs could be done in a .0001 seconds. Hmmm.... I guess I'd have to
upgrade the lead screws and ways too.