Richard wrote:
On 11/24/2013 12:45 AM, Gunner Asch wrote:
On Sun, 24 Nov 2013 00:20:47 -0600,
wrote:

On 11/24/2013 12:00 AM, Gunner Asch wrote:
On Sat, 23 Nov 2013 23:33:15 -0500, "Mike Marlow"
wrote:

Gunner Asch wrote:


Ayup...aerospace requires 50 millions or half 10ths all the time.

Which is damned hard to do with machines that hold +/- 2 tenths


One might think it is impossible to do with repeatability and
assurance.

Hardly impossible. It happens many thousands..hundreds of
thousands of parts a day.

So - I am curious - what is it that aerospace requires that is 50
"millions"? I worked in that space for a while and I never saw
any tolerances like that - but that does not say much. I believe
that even the space shuttle does not demand tolerances that close
- but I really do not know.

Jet engine parts, microwave wave guides, thousands of things. Most of
which I was not cleared to know what they were when I ran
into them.. An awful lot of optical stuff is that or more.

Shrug. And a lot of that stuff I figured would be good at
+0/- .001...but..the specs...

As the truism goes...the more zeros you add to the right of the
decimal point...you multiply the cost by a factor of 5-10


Half a thou? (NOBODY says 50 millionths!)

Half a thou isnt 50 millionths. Its only 5 tenths.
Half a tenth..is 50 millionths.


Half a TENTH.
I woke up in the middle of the night and realized I wrote that wrong.

Not sure what you were trying to correct Richard. Look at it again - you
still have it wrong.

--

-Mike-