Re: Step resolution

Jan,
Sometimes, you have to be extremely careful when making these
conversions. A number of years ago, the Lansing-Bagnall factory in
the U.K. was building some special forklifts for a distribution
center in Oregon. These vehicles had masts about 60' high, and the
tops were guided on a 4" sq. rail. Due to a CAD operators conversion
error, they were delivered with the masts about 6" too long, and had
to be re-machined on the job site, at considerable cost.
When I ordered some similar machines for a project I was doing in
New Orleans, I triple-checked the drawings to make sure the same
screwup didn't occur. I bought 10 of these vehicles at $148,000 each.

Marv Frankel
Los Angeles

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> In a message dated 8/19/2004 8:40:19 AM Central Standard Time,
> azzi_b@y... writes:
> is the .0025mm per step right, and if so how good is this figure.
> Also what would this be in imperial ?
> azzi:
>
> It amazes me how we dum' Yanks, the last in the world
to "officially" embrace
> Metric, can (usually) handle both mm. and Inches with much less
difficulty
> than you folks across the Pond manage both! At least when
considering the
> Continentals!
>
> 1 Inch (aka "imperial") is, by definition, 25.4000000 mm; 25.4
mm/in. To
> convert inches to mm. simply MULTIPLY by 25.4. To convert mm. to
inches,
> simply DIVIDE by 25.4.
>
> Thus, 0.0025 mm = 0.0025/25.4 = 0.0000984". Whew! That's not
quite a
> "tenth"! (here, "machinists" call one tenth of a thousandth of an
inch "a tenth".
> so, 0.0005 would be called "five tenths".) Machinist? In
England, a
> "machinist" is (perhaps logically) a person who operates machinery,
regardless if
> metal-working or woodworking. I think they call a "metalworking
machinist" an
> "engineer", which has a whole-nuther connotation here in the USA.
Thousandth of
> the inch? We call that "mil" here! I remember hearing you UK folk
call a
> millimetre a "mil". One must keep his ears, eyes, and thoughts
open, or end up
> WAY-wrong!
>
> Jan Rowland, Yank Troll
>
>
> [Non-text portions of this message have been removed]