hi, my brother just told me that bmw are suppossed to have invented that crack mechanics? bmw use it on splitting the conrod caps, and also chev or holden? there is a article on it in the " mem" or motor (or mechanical) engineering news, its a trade magazine for auto motive businesses.
mark k ----- Original Message ----- From: "Bob" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, June 23, 2002 1:12 PM Subject: Re: nitrogen filled tires > Heres a bit of a digression as well using physics - In this course I > am doing we were discussing the use of crack mechanics to form things > from metal, and apparently there was/is (?) a project going on at Ford > to try to form brake discs using cracking, so that you just take a > plate of metal the right thickness, give it a jolly good whack in all > the right places, and if all goes to plan a circular crack is formed > in the shape of a brake rotor and the job is done. I recon that would > be impressive to see. > > Sunday, June 23, 2002, 1:28:35 PM, you wrote: > > TR> Yes. A frame full of helium would have more mass than a frame under > TR> complete vacuum, therefore gravity would exert a larger force on the > TR> helium cos of one of Newton's laws, Force = mass * acceleration (ie even > TR> though helium is lighter than air, it's still heavier than nothing) You > TR> can't really use vacuum filled tyres though :) > > TR> Aren't these digressions great? Who'd have thought there was a use for > TR> high school physics > > TR> - Tom > > TR> PS Maybe one of the other reasons why nitrogen is used in some forms of > TR> motorsport is that it's inert, incase of a fire? > > TR> mark krawczuk wrote: > > >>hi, would u be better of with vacuum in the frame? > >> > >> mark k > >>----- Original Message ----- > >>From: "james wade" <[EMAIL PROTECTED]> > >>To: <[EMAIL PROTECTED]> > >>Sent: Sunday, June 23, 2002 12:39 AM > >>Subject: RE: nitrogen filled tires > >> > >> > >>>Ive heard of bmx racers using helium? These days those guys are weight > >>>crazy and all, so yeah its like they want a lighter bike and all that. I > >>>even heard of a guy putting helium inside his frame (ie. inside the > >>>tubing). talk about kooky. > >>> > >>>-james > >>> > >>>-----Original Message----- > >>>From: [EMAIL PROTECTED] > >>>[mailto:[EMAIL PROTECTED]] On Behalf Of mark krawczuk > >>>Sent: Saturday, 22 June 2002 8:04 PM > >>>To: [EMAIL PROTECTED] > >>>Subject: Re: nitrogen filled tires > >>> > >>> > >>>i believe that some racing pushbikes use nitrogen in the tyres? > >>> > >>> mark k > >>>----- Original Message ----- > >>>From: "James Cox" <[EMAIL PROTECTED]> > >>>To: <[EMAIL PROTECTED]> > >>>Sent: Saturday, June 22, 2002 1:32 PM > >>>Subject: RE: nitrogen filled tires > >>> > >>> > >>>>Actually I think they do that to maintain a constant tyre pressure > >>>>since nitrogen is less likely to expand with heat increases, a common > >>>>practice > >>>> > >>>in > >>> > >>>>some forms of motorsport. If he really intended to make the tires > >>>>lighter he should have uses helium. > >>>> > >>>>Jame Cox > >>>> > >>>> > >>>>>No > >>>>>I have only ever seen a bloke fill his tyres with nitrogen to make > >>>>>them lighter, similar to bridge construction (true story) > >>>>> > >>>> > >>>>_________________________________________________________________ > >>>>Send and receive Hotmail on your mobile device: http://mobile.msn.com > >>>> > >>>> > >>>--membersozdat------------------------------------------------------- > >>>OZDAT Mailing List Please Note:- > >>>Send (un)subscribe requests to [EMAIL PROTECTED] Send > >>>submissions to [EMAIL PROTECTED] No unauthorised > >>>redistribution of this email http://www.ozdat.com/ozdatonline/index.htm > >>>http://www.ozdat.com/ozdatonline/listindex.html > >>>http://www.mail-archive.com/[email protected]/ > >>>--------------------------------------------------------------------- > >>> > >>> > >> > >> > > > > > > -- > Best regards, > Bob mailto:[EMAIL PROTECTED] > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
