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science forum beginner
Joined: 24 Mar 2005
Posts: 26
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 Posted: Thu Mar 24, 2005 6:53 pm Post subject:
watt meter
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PaulRoybal
science forum beginner
Joined: 24 Mar 2005
Posts: 1
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: One Engineer In the Entire Federal Bench
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"no quotes worth repeating"
I am always amazed at the vehement response one gets when the mention of God is
made. All I did was quote what I thought was from Madison, I retract Madison
as the source, but the response is astonishing. I was chided for mentioning
God and the 10 Commandments in a "sci" news group although it is in my
signature block. The responders to my signature block are not "chided" for
being "off-topic". Simply amazing.
"We have staked the entire future of the American civilization not upon the
power of government, but upon the capacity of Americans to govern themselves,
control themselves, and sustain themselves according to the Ten Commandments of
God."
Someone |
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N:dlzc D:aol T:com (dlzc)
science forum Guru
Joined: 25 Mar 2005
Posts: 2835
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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Dear Brian Whatcott:
"Brian Whatcott" <betwys1@sbcglobal.net> wrote in message
news:i7s2011c67i191rmj7qf52vrnva9114gi4@4ax.com...
| Quote: | On Wed, 2 Feb 2005 07:00:26 -0700, "N:dlzc D:aol T:com \(dlzc\)" <N:
dlzc1 D:cox T:net@nospam.com> wrote:
///
- Speed of sound is a function of pressure also. So time of flight in a
sound pulse directed through the area of interest..
///
Others might have some bright ideas.
c is a function of temperature not pressure in a given gas.
|
I will meet you halfway. c_medium is a function of specific volume (or
density), which is a function of both temperature *and* pressure (and the
specific gas/mixture). The OP is interested in intercellular pressure, so
I don't think gas speed is of importance.
David A. Smith |
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BobK207
science forum addict
Joined: 12 May 2005
Posts: 52
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Ball Screw Noise - Normal??
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I have a device (a small shake table) that incorporates a motor driven
ball screw arrangement to drive the table. I had a student setup the
device & get it up and running.
He mentioned to me that the table seemed "a little noisey". I took a
look at it . It was a lot more than a little noisey.
It sounded like s**t!
It had been damaged in shipment such that the keeper & wave washer
allowed excessive axial play. Removing the axial play fixed the
problem.; noise gone.
cheers
Bob |
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BobK207
science forum addict
Joined: 12 May 2005
Posts: 52
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Ball Screw Noise - Normal??
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I have a device (a small shake table) that incorporates a motor driven
ball screw arrangement to drive the table. I had a student setup the
device & get it up and running. awhile ago.
He mentioned to me that the table seemed "a little noisey". I took a
look at it . It was a lot more than a little noisey.
It sounded like s**t!
Upon examination we determined it had been damaged in shipment such
that the keeper & wave washer allowed excessive axial play. Removing
the axial play fixed the problem.; noise gone.
cheers
Bob |
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Brian Whatcott
science forum Guru Wannabe
Joined: 09 May 2005
Posts: 267
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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On Wed, 2 Feb 2005 18:46:56 -0700, "N:dlzc D:aol T:com \(dlzc\)" <N:
dlzc1 D:cox T:net@nospam.com> wrote:
....
| Quote: | dlzc1 D:cox T:net@nospam.com> wrote:
///
- Speed of sound is a function of pressure also. So time of flight in a
sound pulse directed through the area of interest..
///
c is a function of temperature not pressure in a given gas.
I will meet you halfway. c_medium is a function of specific volume (or
density), which is a function of both temperature *and* pressure (and the
specific gas/mixture). The OP is interested in intercellular pressure, so
I don't think gas speed is of importance.
David A. Smith
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You read the equation and you certainly won't be the first to suppose
that c is a function of pressure. That's what it seems to say, after
all.
But it isn't. Take my word for it.
Brian W |
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Ed Ruf
science forum beginner
Joined: 19 Jun 2005
Posts: 40
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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On Thu, 03 Feb 2005 04:00:57 GMT, in sci.engr.mech Brian Whatcott
<betwys1@sbcglobal.net> wrote:
| Quote: | You read the equation and you certainly won't be the first to suppose
that c is a function of pressure. That's what it seems to say, after
all.
But it isn't. Take my word for it.
|
You're talking about a gas. In liquids the effect of compressibility would
appear to be on the order of 10-20%.
----------
Ed Ruf Lifetime AMA# 344007 (Usenet@EdwardG.Ruf.com)
http://EdwardGRuf.com |
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Brian Whatcott
science forum Guru Wannabe
Joined: 09 May 2005
Posts: 267
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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On Thu, 03 Feb 2005 06:11:41 -0500, Ed Ruf <egruf_usenet@cox.net>
wrote:
| Quote: | On Thu, 03 Feb 2005 04:00:57 GMT, in sci.engr.mech Brian Whatcott
betwys1@sbcglobal.net> wrote:
You read the equation and you certainly won't be the first to suppose
that c is a function of pressure. That's what it seems to say, after
all.
But it isn't. Take my word for it.
You're talking about a gas. In liquids the effect of compressibility would
appear to be on the order of 10-20%.
----------
Ed Ruf Lifetime AMA# 344007 (Usenet@EdwardG.Ruf.com)
http://EdwardGRuf.com
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True.
I should know better than continue after making a correction - but I
will this time.
Not only was I talking about gases, Ed, so were *you*.
Take a look at this quote of yours:
"I will meet you halfway. c_medium is a function of specific volume
(or density), which is a function of both temperature *and* pressure
(and the specific gas/mixture)."
Brian W Altus |
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N:dlzc D:aol T:com (dlzc)
science forum Guru
Joined: 25 Mar 2005
Posts: 2835
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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Dear Brian Whatcott:
"Brian Whatcott" <betwys1@sbcglobal.net> wrote in message
news:9e6401l3q8mdabgkt6po7fjv9qul1msvih@4ax.com...
| Quote: | On Thu, 03 Feb 2005 06:11:41 -0500, Ed Ruf <egruf_usenet@cox.net
wrote:
On Thu, 03 Feb 2005 04:00:57 GMT, in sci.engr.mech Brian Whatcott
betwys1@sbcglobal.net> wrote:
You read the equation and you certainly won't be the first to suppose
that c is a function of pressure. That's what it seems to say, after
all.
But it isn't. Take my word for it.
You're talking about a gas. In liquids the effect of compressibility
would
appear to be on the order of 10-20%.
----------
Ed Ruf Lifetime AMA# 344007 (Usenet@EdwardG.Ruf.com)
http://EdwardGRuf.com
True.
I should know better than continue after making a correction - but I
will this time.
Not only was I talking about gases, Ed, so were *you*.
Take a look at this quote of yours:
"I will meet you halfway. c_medium is a function of specific volume
(or density), which is a function of both temperature *and* pressure
(and the specific gas/mixture)."
|
Dude, that was "David A. Smith" that said that.
David A. Smith |
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strato
science forum beginner
Joined: 24 Mar 2005
Posts: 1
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Ball Screw Noise - Normal??
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Bob, this sounds exactly like our situation. In fact we had concerns
about the way these items were packed when we received the shipment. In
any case we are going to replace the balscrew-nut. I don't have a lot
of experience with these devices (mainly use power screws), so this NG
has been of great help. Thanks to everyone!
Strato |
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Brian Whatcott
science forum Guru Wannabe
Joined: 09 May 2005
Posts: 267
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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On Thu, 3 Feb 2005 07:02:33 -0700, "N:dlzc D:aol T:com \(dlzc\)" <N:
dlzc1 D:cox T:net@nospam.com> wrote:
| Quote: | Dear Brian Whatcott:
"Brian Whatcott" <betwys1@sbcglobal.net> wrote in message
news:9e6401l3q8mdabgkt6po7fjv9qul1msvih@4ax.com...
On Thu, 03 Feb 2005 06:11:41 -0500, Ed Ruf <egruf_usenet@cox.net
wrote:
On Thu, 03 Feb 2005 04:00:57 GMT, in sci.engr.mech Brian Whatcott
betwys1@sbcglobal.net> wrote:
You read the equation and you certainly won't be the first to suppose
that c is a function of pressure. That's what it seems to say, after
all.
But it isn't. Take my word for it.
You're talking about a gas. In liquids the effect of compressibility
would
appear to be on the order of 10-20%.
----------
Ed Ruf Lifetime AMA# 344007 (Usenet@EdwardG.Ruf.com)
http://EdwardGRuf.com
True.
I should know better than continue after making a correction - but I
will this time.
Not only was I talking about gases, Ed, so were *you*.
Take a look at this quote of yours:
"I will meet you halfway. c_medium is a function of specific volume
(or density), which is a function of both temperature *and* pressure
(and the specific gas/mixture)."
Dude, that was "David A. Smith" that said that.
David A. Smith
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Yep, sounds like I was trying to pick an argument with someone
who was agreeing with me.
Ah well....
Brian W |
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Guest
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: 1.5 gram CO2 cartridge source?
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How about life vests or personal flotation devices. Their internal
volume might be about right for these smaller cartridges you are
looking for. The tip off might be if it has a threaded neck on the
actual cartridge.
I have seen small replacement cartridges at boating supply stores.
Good Luck
Tom Lipton |
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Lars Johansson
science forum beginner
Joined: 24 Mar 2005
Posts: 1
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor, thanks
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Thanks to all who replied, I have picked up
a few leads that I will pursue.
--Lars |
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Ed Ruf
science forum beginner
Joined: 19 Jun 2005
Posts: 40
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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On Fri, 04 Feb 2005 01:08:38 GMT, in sci.engr.mech Brian Whatcott
<betwys1@sbcglobal.net> wrote:
| Quote: | Yep, sounds like I was trying to pick an argument with someone
who was agreeing with me.
Ah well....
|
FWIW, this came up recently in sci.mech.fluids. I wasn't aware of the
magnitude of the correction in real systems and was informed of the 10-20%
range.
----------
Ed Ruf Lifetime AMA# 344007 (Usenet@EdwardG.Ruf.com)
http://EdwardGRuf.com |
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Brian Whatcott
science forum Guru Wannabe
Joined: 09 May 2005
Posts: 267
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| Posted: Thu Mar 24, 2005 6:53 pm Post subject:
Re: Subminiature pressure sensor
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On Wed, 2 Feb 2005 07:00:26 -0700, "N:dlzc D:aol T:com \(dlzc\)" <N:
dlzc1 D:cox T:net@nospam.com> wrote:
///
| Quote: | - Speed of sound is a function of pressure also. So time of flight in a
sound pulse directed through the area of interest..
///
Others might have some bright ideas.
David A. Smith
|
c is a function of temperature not pressure in a given gas.
Brian W |
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