Subject: Re: Flow Control Valves
From: nbwood@lamar.ColoState.EDU (Norman Wood)
Date: 21 Jan 1997 16:36:54 -0700
Brian Anderson (briander@ix.netcom.com) wrote:
: Can anyone suggest a source for miniature flow control valves?
: Something similar to Lee "Flowserts", but with greater precision,
: hopefully. Nominal size: 1/4 inch dia, pressure to 3000 psi. Fluid
: flow is 0.13 gpm for one case, 0.50 gpm for another.
I'm not familiar with "Flowserts", so I'm not sure if this will be
helpful. Badger Meter has a division called Research Control which
produces control valves with very small flow coefficients. According
to the ISA web page, they are at:
Badger Meter Inc.
Research Control
6116 East 15th Street
Tulsa, OK 74112
Phone: 918-836-8411
Norm Wood
Atmospheric Science Department
Colorado State University
Fort Collins, CO 80523
nbwood@lamar.colostate.edu
Subject: Re: Pneumatic design software???
From: hartye@iol.ie (Ed Harty.)
Date: 19 Jan 1997 22:32:27 GMT
Hi there,
From what I have seen Norgren Martonair do a very nice package
called pneusim, basically it is a package that allows pneumatic circuits
to be drawn and if needed can be interfaced to a PLC by means of a digital
input/output card on the pc so that the software on the PLC can be tested.
I dont have an address for them offhand.
Hope this helps,
Ed Harty
hartye@iol.ie
Slash (slash@pacific.net.sg) wrote:
: Hi,
:
: I wanted to do pnuematic circuit designs, presented in nice graphics
: for my school project. Does any one knows any software that can help
: me on this? I've came across some software for electrical designs such
: as "electronic workbench" & "crocodile clips" but never came across
: one for pneumatics.
:
: Any Info will be appreciated, thanks in advance. Please e-mail
: slash@pacific.net.sg
:
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Subject: Re: How to determine Residual Stress Levels ?
From: prime@lanl.gov (Mike Prime)
Date: Tue, 21 Jan 1997 14:43:00 -0700
"G.Quinlan" wrote:
> Any information on how to determine residual stress levels in titanium
> components (non-destructive) ?.
If you are restricted to nondestructive you can use X-ray diffraction to
get surface stresses (within a few microns of the surface). Or you can
use neutron diffraction to get stresses at greater depths. But it can't
resolve the stress to less than about 1mm - meaning you can get the
avergae stress in the first 1mm of depth but not the profile. There are
some other nondstructive methods, but they are less common.
Some type of depth profile is most often desired when looking at residual
stress. Now you have to go to some type of destructive testing. You can
use X-rays and etch away layers, or hole drilling or other mechanical
methods. A brief and not especially objective comparison between different
methods is available at:
http://wxvax7.esa.lanl.gov/compliance/compare.html
and if you go to the "reference" section, paper 24 measured residual
stress in shot peened titanium. A fairly thorough look at residual stress
measurement techniques is "Handbook of Residual Stress Measurement," 1996,
editor Jian Lu.
If you give us more details of exactly what you want to measure (to what
depths and what the shape of the part is), people here could probably
suggest suitable methods. Or, if you're not sure, then two pieces of info
would help: what made the stresses (casting, forging, peening, ..) and why
you want to know (fatigue cracking, fracture, distortion, etc).
Yours,
Mike
Subject: Re: Affordable Route to Quality
From: Mark Howie
Date: Tue, 21 Jan 1997 18:50:44 -0800
Spalding's wrote:
>
> Anthony James Bentley wrote:
> >
> > You really are missing the point of course.I suspect deliberately.
> > Everyone knows these days that putting ISO 9002 on a product boosts the
> > quality of same by a factor of between $5 and $5000 per unit.
> >
> > >Perhaps I can be promoted to middle management with my new found
> > >knowledge. I'm getting the demo!
> >
> > When you finally comprehend the difference between quality as understood
> > by economists and the more mundane stuff understood by common engineers,
> > you may, possibly, be on the way to advancement.
> > --
> > Anthony James Bentley
> > Surface Data
> > Scientific Instrumentation and Software
> > Web site http:\\www.surface.demon.co.uk
> I didn't miss the point .. we are going through a mass QS 9000 festival
> at my company.. I don't see it changing quality, that has to come by
> deep changes in the way things are done.
>
> I believe in the team concept, I don't think Quality can be added by
> buying a computer program or by edicts from above. Come live in the real
> world.
>
> Also, since most of our products are sold for $1 to $2 ea to the auto
> industry, how do we get this price increase of $5 each minimum? Our
> company president would like to know!
To obtain ISO9000 for the sake of being able to claim you have it does
not increase the value of your product. To obtain a real value for
ISO9000 you have to evaluate the quality of your product now as compared
to the quality you can obtain from having a consistant product. If your
current costs including scrape and rework are $0.00 then you are as good
as you are going to get. If you work for a company that has ongoing
customer issues, repeated scrap problems and expensive rework your value
is in reducing the associated costs and ensuring repeat customer
business.
