On 18 Apr 2007 19:30:01 -0700, art wrote:

On 18 Apr, 17:09, Danny Richardson wrote:
On 18 Apr 2007 14:17:27 -0700, art wrote:

I've never seen a 'spirit level' being used in a tool room for
accuracy nor could I specify from what you said as to why it should be
used from now on instead of conventional means.

Well, I guess you haven't had much experience in the tool room.
Otherwise you would have been aware of how precession levels used to
set up machinery. They are used often. How do you think those long bed
lathes are adjusted so they are straight, level and parallel? Yes, my
poor misinformed person they use precession levels.

Danny, K6MHE

Danny,
don't be silly, you obviously have not spent a lot of time in a tool
room.

Only forty years plus. In that time I've moved and/or installed many
lathes, mills, planners, surface plates and etc... Each time using a
precession level. Just as I had been taught by a master millwright
back in my apprentice days.

A tool room machine is not in any way used as a reference level. What
is used as a reference level is the machine slide with reference to
the cutting plane. An installation of a machine is subject to settling
but it does not affect the accuracy of the product.

Yea sure a twisted lathe bed does accurate work....BS

I see your knowledge of shop practices is exceeded only by your
knowledge of antenna theory.

Danny, K6MHE