Yes every MechE is taught the principles of thermal expansion and contraction. And that is why you want to heat the material which the stud is in and freeze the stud its self. It will give you slightly more clearance that if you heat both to the same temp. If you heat the aluminum to about 500F and the steel to the same temp you would have about 0.002inches of clearance if all the metal was clean. Now if you can cool that steel to 0F that clearance should be closer to 0.004inches. These numbers are based on ideal conditions and were calculated quickly so they might be off a bit but it gives a rough idea of what is going on. And maybe to give a little credibility to that I am a Mechanical Engineer and have just started to study for my PE so this stuff is fresh in my head. Andrei ----- Original Message ----- From: "checksix3" <jetjock11@xxxxxxxx> To: <DMCForum@xxxxxxxxxxxxxxx> Sent: Monday, June 30, 2003 10:37 PM Subject: [DMCForum] Re: Worst Case Scenario: The DeLorean Edition > >>Heat the area around the stud and cool<< > > Where the heck did this crazy method come from? Just heat the area, > don't cool it. There is no fastener that won't come out with heat but > the block and manifold have great thermal mass and it takes a lot of > energy to bring it up to temp. A whimpy propane toruch may not do it > unless you leave it on there a long time. > > The reason this works is that when you heat a fastener the entire > assembly expands, not just the stud. The nut, bolt and the space > between them expand together. Every mechanical engineer is taught this > principle in the first year of college. Cooling it will be > counterproductive. > > > > > To unsubscribe from this group, send an email to: > DMCForum-unsubscribe@xxxxxxxxxxxxxxx > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > Yahoo! Groups Sponsor <http://rd.yahoo.com/M=251812.3170658.4537139.1261774/D=egroupweb/S=170512 6215:HM/A=1564416/R=0/SIG=11ti81skc/*http://www.netflix.com/Default?mqso=6 0164797&partid=3170658> <http://us.adserver.yahoo.com/l?M=251812.3170658.4537139.1261774/D=egroupm ail/S=:HM/A=1564416/rand=435768307> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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