I heard from LEGO designers that Mech/Construction engineering are directly related to LEGO.If I learned Construction engineering materials, I would be just good at building the structures.Meanwhile, Mechanical engineers can build everything except for structuresso If I became Mechanical engineer, I would be involved in more LEGO projects that the construction engineer does.What I mean by that is, Mech engineer can build vehicles, planes, submarines.etc They can build more things whereas construction engineers only build Structures.so which should I choose to study? seems like Mech has more opportunities.
Like the others have said, weird sounds can come from virtually anywhere and be transmitted by the frame, so it can be very hard to isolate the sourceIf it is a crack, it will showThe highest-stress area on the bike will be around the bottom bracket, especially the bottom of the seat post and the chain stays near the bottom bracketRegarding the warranty, Gary Fisher warrants the frame for the lifetime of the original ownerCracks in the welds are a defect, same as a crack in a tubeAluminum has a limited fatigue life; when it bends it work-hardens until it becomes so brittle that the least stress can crack itThat's why aluminum frames are engineered to be stiff - so they don't do thatA properly-designed aluminum frame will not break If you are not the original owner, many manufacturers will sell you a reduced-price replacement frameYou might contact them and ask, it can't hurt.
Construction is making buildings and other structures which basically sit there and have to be able to resist stress from wind and occasional earthquakesBuildings, bridges, stadiumsMechanical normally deals with moving stuff, like cranes, conveyors, cars, trucks, elevators - variable strains and moving parts.
Unfortunately with alumthe noise could come from unsuspecting places as the alumtubing transmits noise rather wellIf you can not find any cracks or alumdust check your BB and your head setI have a Tassajara and the last time I had a strange noise it sounded like came from the BB but was actually a worn out head set,
That's a common area to crack, but it's likely something else if you can't see anything You might try doing the seat-bounce thing with a helper so that one of you can carefully examine the welds and bottom of the clamp-slot on the tube (if it has one).under pressure you may spot a crack opening up It could just be a creaky seatpost.very commonGrease it up with some thick grease and see if the problem is still thereIf so, then grease the saddle rails and seatclamp bolts, tooFailing there, do the bounce thing again and have your helper look at the welds at the bottom bracket and chainstays, maybe even feeling underneath the tubing with a finger It's possible to have an internal crack, but usually if aluminum is going to crack it'll show through the surface right awayI'm guessing it's just metal-to-metal contact with a componentWork through each part systematically (not forgetting the bottom bracket cups.tight-n-lubed) and you'll find itDon't overlook silly things like cable housing ends creaking in their holdersIt's amazing how sounds can travel and magnify through an aluminum frame to where they sound like something entirely differentIf it does turn out to be a cracked frame, Trek/GF should be good about either relacing it or getting you a discounted crash-replacement frame Hope this helps.good luck! :o)
