>-----Original Message----- >From: John Woodgate [mailto:[email protected]] >Sent: Monday, September 24, 2001 11:19 PM >To: [email protected] >Subject: Re: Steel ball for impact tests > > > >I read in !emc-pstc that Jacob Schanker <[email protected]> >wrote (in <003101c14575$a8b4dcc0$2ef1fea9@f0p1o1>) about >'Steel ball for >impact tests', on Mon, 24 Sep 2001: >> >>The mention of traceable calibration for a steel ball makes me wonder >>(tongue partially in cheek) about verification of the >gravitational constant >>involved in the testing. Are adjustments to be made for local >gravitational >>anomalies, altitude above sea level at the place of >measurement, and the >>mass of the item tested (gravitational attraction being a >function of mass)? > >Yes, of course, and a campaign must immediately be launched to write a >specification and certify all these guide tubes that people are using. >Just think, some of them may have cost less than USD1000. > >Draft specification > >Material: PTFE 99.99% pure > >Inside diameter 50.2000 mm > >Length: 1.00000 m > >Straightness: 10^-6 > >Concentricity: 0.0002% > >Air release hole diameter: 4.000 mm > >Air release hole pitch: 45.000 mm > >Colour: Optional, but uniform and subdued. >-- >Regards, John Woodgate, OOO - Own Opinions Only. >http://www.jmwa.demon.co.uk >Eat mink and be dreary! John, I have finally found my market niche. Announcing the formation of the International Impact Tube Standardization & Accreditation Authority (IITSAA). Be aware that I have copyrighted the characteristic "Schlooorp!" sound of the standard ball and tube. Further, Schlooorp! is now a registered trademark of the Authority, and the creation of the Schlooorp! sound by unlicensed tube balls will not be tolerated. The authority will protect its trademarks and copyrights vigorously, as we expect significant licensing ventures, starting with the underwear and coffee mug markets. Ed [Don't tell Cubic about this quite yet] Ed Price [email protected] Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
