

| Subject: | Re: Cracked Slider Hub Pictures |
| From: | Mark Tuovinen |
| Date: | Wed, 16 Nov 2005 16:28:30 -0900 |
Hey John, My father worked for Hughes in the 60's when we lived in Tucson(where I was born), refurbishing air-to-air missles. He eventually grew tired of the lay offs between military contracts and took a job in Alaska in 1969. My parents agreed to try life here for one year to see if they would like it, they are still here. Mark in AK ----- Original Message ----- From: John Bange <jbange@GMAIL.COM> Date: Wednesday, November 16, 2005 3:40 pm Subject: Re: Cracked Slider Hub Pictures To: vanagon@GERRY.VANAGON.COM > On 11/16/05, Loren Busch <starwagen@gmail.com> wrote: > > > > Bad initial design. What idiot put a square corner on a opening > in a piece > > subject to lateral stress? Can you spell 'Comet Jet'? > > > > Heh. Yeah, that's right, same deal there with square windows. I > suspect the > square cutouts in the 3-4 synchro slider hub are the work of a junior > process engineer whose work was signed off on by an inattentive senior > mechanical engineer. Process engineers seem to gravitate towards > squared-off > edges on things because it's easier to gauge whether the manufacturing > process is properly calibrated. My father used to work on missile > systemsfor Hughes Aircraft in the 80's. The DOD made them "second > source" many > missile parts from Raytheon, a very poorly run company. One day Hughes > tested a $60 million dollar missile and the rocket motor failed to > ignite.It dropped off the F-14 like a bomb and smashed to pieces > on the desert > floor. Investigation showed that the rocket safety failed to > disengage. The > safety was a 12-toothed spring loaded rack held in place by a 6- > toothedpinion gear on a stepper motor. The motor would rotate > exactly twice, then > the arm would snap free under spring pressure and hit the switch > ignitingthe rocket. The very end of the Hughes version of the rack > was rounded. The > Raytheon version was squared off and, as a result, it in effect > had a > THIRTEENTH TOOTH on the end of the rack. This extra tooth stayed > caught on > the pinion, preventing motor ignition. The Raytheon process > engineers cut > corners by discarding details on the drawing they felt were > superfluous(such as rounding the end of the rack) thus saving the > company money. I bet > they felt real smart, having saved the company maybe a quarter man- > hour per > part. My father said that fully half the machined parts they > second sourced > from Raytheon where similarly "process engineered" into uselessness. > Everything from Simple angle metal brackets incompletely shaped to > fit in > carefully specified places, to steel anchor points with squared > off corners > instead of properly rounded to fit MILITARY STANDARD underwing weapon > stations. > > Back to obligatory Vanagon content: GoWesty has some pretty good > pics of > failed 3-4's > <http://www.gowesty.com/3-4syncrohub.html> > -- > John Bange > '90 Vanagon - "Geldsauger" >
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