If you own a DeLorean. You should have some technical or mechanical expertise if not send it to DeLorean In Huston! Great people! My brother in-law couldn't screw a screw in if I was holding the screw driver! Unless your wealthy, and got the bucks, go for it! I'm Selling mine.. Don't want to, The love of my life died "my wife" and I am an 20 year veteran. Hate to sell it "O" well. Life changes. We had fun.!! Time to Go! Jon Manss Lockwood 2173 ----- Original Message ----- From: "K.L. (KAYO) Ong" <klo@xxxxxxxxx> To: <dmcnews@xxxxxxxxxxxxxxx> Sent: Tuesday, February 07, 2012 3:15 PM Subject: Re: [DML] Modified Trailing Arms For 1/2" Bolts > Too much hardness (brittle) is just as bad as too soft (ductile)... > As for Toby's bolts.... So far, Toby's bolt has been serving my car > very well on the roads and streets of NYC. since his introduction > many years ago. Before Toby's bolts, I had replace the trailing > arms bolt twice! First time, they were both bolts were bent upon > inspection. The right side bolt was more bent to the point a shim or > two fell out. The second time the right side bolt had actually > snapped (sheared) off on a right turn!!! I was luck to be one block > from home... Anyway, my DeLorean was then towed to Rob to have the > replacement to have Toby's bolt installed... > > For what it is worth about softness and hardness about metals from > the aviation industry.... > > Some years ago a helicopter had crashed. Upon inspection, the > primary rotor blade's pivot securing bolt was at fault. This bolt > was made in mainland China, where quality control was not a critical > issue. To the manufacture, steel is steel... The problem was the > bolt produced was way too soft and did not meet the required Rockwell > hardness test as prescribed.... The bolt cost was $5.00 US.... It > was five dollars versus the $20.00 US approved bolt by the > F.A.A.!!! From that failure there were major lawsuits and I > believe the Chinese manufacture got away with it, for one, it was > overseas and government affiliated and two, the company just closed > shop and change it's name... So, that is about soft metal. > > In the USA aviation industry/manufacturing, the rivets that are used > are sent frozen from the manufactures until they are ready for usage > upon assembly. If the rivets are removed from the freezer and they > are not used and or they have been sitting around beyond a designated > time, they are automatically scrapped. The reason is because the > room temperature with bring up the molecules movements which raise > their brittleness (work harden by temperature)... And also, the > assembler who is pneumatically hammering the rivets must know that > there are a prescribed amount of "hits" allow to the rivets. This is > to not to over "work harden" the rivets upon compression which may > create a condition for premature failure!!! Just several years ago, > we have seen planes in the news with the fuselage parts ripped off or > fallen off... Rivet, rivet... That is hardness in metals.... > > Kayo Ong > #5508 > Lic 9D NY > > > > On Feb 7, 2012, at 1:53 PM, Matthew wrote: > >> http://www.industrialchassisinc.com/Web-blog/?p=622 >> >> --- In dmcnews@xxxxxxxxxxxxxxx, "Martin Gutkowski" <martin@...> wrote: >> > >> > Tensile strength is only part of the story, you have to be >> careful with ductility, aka "brittleness" and in general with steel >> the higher the tensile strength, the more brittle it becomes. A >> suspension component should have a degree of ductility, but not to >> the point of fatigue or elastic limit. The torque spec for the TABs >> is far lower than would normally be applied to such a bolt. >> > >> > Martin >> > >> > >> >> > > > > [Non-text portions of this message have been removed] > > > > ------------------------------------ > > To address comments privately to the moderating team, please address: > moderators@xxxxxxxxxxx > > For more info on the list, tech articles, cars for sale see > www.dmcnews.com > > To search the archives or view files, log in at > http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links > > > ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: dmcnews-digest@xxxxxxxxxxxxxxx dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/