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Now G's

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Oct 01, 2006 8:33 am Post subject: Now G's

Bob McCallum a écrit :

 	  Quote: 	
		   *Barry;*

 ** 

 *I don't know, but it's going to be pretty high as the deceleration 

 distance is extremely small, and you have to provide enough force to 

 overcome distorting the plastic past the detents. The weight of the 

 cap is tiny, the force required a few ounces, so the G's will be 

 extreme. (now there's a quantified term for you* *)*

 **


	


Hi all,



Those clear Bic pens are still around in my area.

What I'do is weigh the cap with a precision scale, then push the cap on 

against a larger scale. And then do the math to get the gs...

Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

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nuckollsr(at)cox.net
Guest

Posted: Sun Oct 01, 2006 12:38 pm Post subject: Now G's

At 06:31 PM 10/1/2006 +0200, you wrote:



 	  Quote: 	
		  

<Gilles.Thesee(at)ac-grenoble.fr>



Bob McCallum a écrit :

>*Barry;*

>** *I don't know, but it's going to be pretty high as the deceleration 

>distance is extremely small, and you have to provide enough force to 

>overcome distorting the plastic past the detents. The weight of the cap 

>is tiny, the force required a few ounces, so the G's will be extreme. 

>(now there's a quantified term for you* *)*

>**



Hi all,



Those clear Bic pens are still around in my area.

What I'do is weigh the cap with a precision scale, then push the cap on 

against a larger scale. And then do the math to get the gs...


	


    Sounds like a good idea to me!



    But golly Gilles . . . you wouldn't want this to get

    too simple. After all, we've got all this whippy

    test equipment that would be a shame to waste!



    Bob . . .

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Oct 01, 2006 12:56 pm Post subject: Now G's

 	  Quote: 	
		  

    But golly Gilles . . . you wouldn't want this to get

    too simple. After all, we've got all this whippy

    test equipment that would be a shame to waste!



LOL !
	


The vision of all those engineers in their white coats, and dropping 

pens repeatedly...



Best regards,

Gilles

http://contrails.free.fr

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FLYaDIVE(at)aol.com
Guest

Posted: Mon Oct 02, 2006 4:25 am Post subject: Now G's

In a message dated 10/1/06 12:37:36 PM Eastern Daylight Time, 

Gilles.Thesee(at)ac-grenoble.fr writes:



 	  Quote: 	
		   Those clear Bic pens are still around in my area.

  What I'do is weigh the cap with a precision scale, then push the cap on 

  against a larger scale. And then do the math to get the gs...

  

  

  Regards,

  Gilles Thesee

  Grenoble, France

  http://contrails.free.fr

============================
	


Gilles:



What you would be measuring there would be FORCE, not g's.  It is the force 

to overcome the friction of the pen's closing mechanism.  Don't use your hand 

in the test.  It will adsorb some of the force in the opposite direction and 

give you a lower reading. You should hook up something like a screw / c-clamp 

fixture.  Also, there is basically no acceleration in this test. But, you can 

work out the Mass of the entire pen use acceleration of 32 ft per second squared 

(sorry I do not recall the metric conversion) and apply it to the test.  The 

number will not match the 200 g's I mentioned but it will be quite 

interesting, quite high.



Barry

"Chop'd Liver"

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icubob(at)newnorth.net
Guest

Posted: Mon Oct 02, 2006 5:18 am Post subject: Now G's

what am i missing? i dont see how acceleration enters in this equation? i 

was thinking the weight of the pen body divided into the force needed would 

give the g's. the 32 fps fps would  be used to tell you how fast the pen was 

traveling when it hit the floor.

                                                       bob noffs

---

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dan(at)familybrown.org
Guest

Posted: Mon Oct 02, 2006 5:47 am Post subject: Now G's

-----BEGIN PGP SIGNED MESSAGE-----

Hash: SHA1



bob noffs wrote:



 	  Quote: 	
		   what am i missing? i dont see how acceleration enters in this equation?

 i was thinking the weight of the pen body divided into the force needed

 would give the g's. the 32 fps fps would  be used to tell you how fast

 the pen was traveling when it hit the floor.


	


	Gs are a measurement of acceleration, and you're correct that they can

be determined from the weight of the pen body (or cap, depending on

orientation) and the force required to seat the cap.



	The equation is F = m * a, where F is force, m is mass, and a is

acceleration.  If you want to solve for a, you just rearrange the

equation to a = F / m.



- --

Dan Brown, KE6MKS, dan(at)familybrown.org

"Since all the world is but a story, it were well for thee to buy the

more enduring story rather than the story that is less enduring."

 -- The Judgment of St. Colum Cille

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nuckollsr(at)cox.net
Guest

Posted: Mon Oct 02, 2006 6:23 am Post subject: Now G's

Those clear Bic pens are still around in my area.

  What I'do is weigh the cap with a precision scale, then push the cap on

  against a larger scale. And then do the math to get the gs...

  Regards,

  Gilles Thesee

  Grenoble, France

  http://contrails.free.fr

============================

Gilles:



What you would be measuring there would be FORCE, not g's.  It is the force

to overcome the friction of the pen's closing mechanism.  Don't use your hand

in the test.  It will adsorb some of the force in the opposite direction and

give you a lower reading. You should hook up something like a screw / c-clamp

fixture.  Also, there is basically no acceleration in this test. But, you can

work out the Mass of the entire pen use acceleration of 32 ft per second 

squared

(sorry I do not recall the metric conversion) and apply it to the test. The

number will not match the 200 g's I mentioned but it will be quite

interesting, quite high.



    Force is force is force . . . whether it's applied with

    the hand or any other device is not material to the

    measurement . . . except that to measure PEAK force as

    the cap moves over detent might me easier to observe

    if the force is applied in very small, smooth increments

    like with the clamp.

        Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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Bill Denton

Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA

Posted: Mon Oct 02, 2006 7:33 am Post subject: Now G's

"the cap moves over detent"



JFTR: There is no detent, the cap is held in place by friction...



--

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Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Oct 02, 2006 9:58 am Post subject: Now G's

Hi all,



 	  Quote: 	
		  

 JFTR: There is no detent, the cap is held in place by friction...

   


	


That's right, the clear Bic has no detent.



For those interested, I've just done the Bic experiment.

I'll take some pictures tomorrow, and craft a preliminary report on this 

major contribution to the advancement of Bic science.



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

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