Originally Posted by
spin55x11
Hi Tom,
I have a question about the engineering design side of things. As you stated, you don't really have an engineering background. I have always wondered, when you design a frame, especially a very non-standard size one, how much do you actually work with numbers and how much do you just go by experience, feel, and judgment? The numbers part would involve both the geometry of the frame and the properties of the materials you are working with. I can imagine a completely engineering based approach where the material properties are all quantified and the frame geometry is modeled mechanically (I assume somewhere in the Trek R&D labs such a fully CAD supported design environment must exist). I can also imagine a more experienced based approach where everything is just relative (stiffer here, looser there, a little steeper, etc). I assume you lean more on the experience side of things, but I was wondering how much you actually take the more numbers based stuff into account when you design. I would think you have to work out all the frame geometry numbers just so things fit, especially the components, but do you really work through all the torsional stiffness and modulus-of-this-and-that properties of the materials you are working with, or do you just sort of know where to go with it all based on experience? Along the same lines, how often do you "miss"? I can see how your experience is such that you can fine tune around an average design to get the desired result, but did you ever build something and find out that you simply didn't achieve what you were trying for?
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