Newsgroup sci.engr.mech 29532

Rant on-- a different perspective.
A Chief Engineers Creed---
 The amount of calulation required to verify the design of the part is
inversely proportional to the probablilty of the part working.
  Don't confuse fit with function-- a part that fits is not necessarily a
part that works.
  The probability of an assembly that works in the shop working in the
field is inversely proportional to the number of parts multiplied by the
number of hours of design time.
  When your competitors hawk the same kind of product, upper management
wants product differentiation.  Then do not design for function, design
marketing tools. 
  Always keep a secret simple design ready to replace the complex one at
test. 
   Never ever let computer simulation testing replace physical testing--
especially if a computer will control the part.
   The boys and the toys will rapidly exit testing two minutes after it
looks like there will be a problem so you can tell the President, not
them. Go "Oh no!", shut down the test, and start calculating madly
whenever you want to get back to fixing their plaything uninterrupted.
   Remember, Germans never change anything moving after the second year of
product life and they have a reputation for reliability-- even though the
first two years of the product is junk. Don't change moving parts- change
the look. 
  A good looking part that works much of the time sells better than an
ugly part that works all the time. 
  If they could have made it better, they wouldn't ask you . 
'nuff on that---
Note-- there is a very sound reason for more calculation reducing the
probability of proper function-- Because most equations are the resullt of
experimental observation, each has a probablility of error inherent in the
equation from the collating and equation curve-fit of the data. The more
calculations, the more errors in each multiplied together, the less
probability of success. 
  Slide rules limit calculation-- but they do suck. (I have a round one, a
short one, and a "big" one-- wouldn't trade any for my HP on a bet.)
So rant on-- it's sure nothing new to the Internet.   

Keywords: 
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I am interested in new methods of blood pressure measuring.
	oded - mechanical engineer
	Aran R&D;

I would like to know how the casio watch measure the blood pressure ?
	Oded Elish - Mecanical engineer
	Aran R&D;

I am interested in the explanation of how the casio watch for blood
pressure measuring works.
	Oded Elish - Mechanical engineer
	Aran R&D;

iris wrote:
> 
> I am interested in the explanation of how the casio watch for blood
> pressure measuring works.
> 
>         Oded Elish - Mechanical engineer
>         Aran R&D;

I am interested in new methods for blood pressure mesearments.
	oded elish - mechanical engineer
	Aran R&D;

You don't seriously mean someone sends drawings out into the shop with
limit designators on them. They're an excellent way for expressing the
nature of a fit but they're only for engineers. Shop drawings should
always show actual dimensions.
But back to the original question, there are lots of books which show
limits as tables. A program or spreadsheet shouldn't be too hard to
write yourself.
On Thu, 02 Jan 1997 17:28:34 -0800, Sean Tracey
 wrote:
C:\>randall williams wrote:
C:\>> 
C:\>> Is there a source for charts or a program that will
C:\>> give the metric limits and fits from 0 to 3500mm
C:\>> with all the letter and number combinations?
C:\>> Even formulas would be a help or pointers to references
C:\>> where they can be found.
C:\>> 
C:\>
C:\>Yes, Mr. Williams there is a source.  Get a hold of the latest
edition
C:\>of Machinery's Handbook, it very common, many national bookstore
chains
C:\>have it.  If you can't find it local, try Brown's Book Shop at
C:\>713-652-3937 they will definitely have it and will take your order
over
C:\>the phone.
C:\>
C:\>Machinery's Handbook has all the metric fits with all the letter
and
C:\>number combos.  If it doesn't have a particular combo, I think
there is
C:\>enough information to be able to figure out the tolerance.  Be
warned, I
C:\>found the metric system of fits to be ridiculously complicated and
you
C:\>must be careful not to make a mistake.  Why ask for a machinisist
to
C:\>make an error with this silly system.  I recently "translated" a
drawing
C:\>so that a machinist could use it.  I eliminated all of the B7, K11
bingo
C:\>nonsense and put the maximum and minimum sizes on the drawing were
they
C:\>belong.  The purpose of a drawing is to provide all the
information
C:\>necessary to make a part.  The person using the drawing shouldn't
have
C:\>to look up a tolerance from a chart and then write it down on the
C:\>drawing anyway.  
C:\>
C:\>Good luck,
C:\>
C:\>Sean Tracey
Michael Watson
Load Measurement Systems
(mvwatson@ozemail.com.au)
(http:/www.ozemail.com.au/~mvvwatson/loadcell)
Manufacturers of custom load cell designs.

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Industrial Systems Sales and Marketing in the New World
the hidden reasons behind lost sales.
Philip E Scott  1/4/97
Pscot@internetMCI.com
Copyright 1997  Permission granted to copy and distribute
complete with all footers and headers for non commercial
purposes only.
Summary:
This article  addresses several types of sales situations
and issues when doing business within the borders of the
United States.    
· Tax avoidance is a primary goal.  With corporate income
taxes running 25% or more, and executive salary income taxes
often running 60%  or more (state, federal and social
security), these considerations more often than not outweigh
all other features and pricing options combined.   The
effective sales strategy is built around this range of
sometimes unfortunate circumstances.
· The hidden decision makers.  When making a sales
presentation often the real decision makers are not present.
· Packaging, is the winning formula.   If you are selling a
single item or dedicated system, you will loose the sale
most often to another firm that is selling value added
service or compound systems.   The more value added, and the
more your system or service pervades the clients entire
operation, the better your chances for a sale.
The full article runs 10 to 15 pages and is available by
email  to qualified firms.    other
articles by same author are on several web zines.
 for article on successful project
management approach.
Mr. Scott is a mechanical engineer with 30 years experience
as a design build industrial systems contractor and
consultant on many projects all over the United States for
clients such as IBM, the US Dept of Energy, Green Giant
Foods, Indo Pacific Fisheries,  Monsanto Chemical, and many
of the worlds largest engineering and construction firms.
Specialty areas are complex or critical HVAC, industrial
Refrigeration, process and Project Management.
Ph. (214)888-8853 msg     (210)361-1888 job site.