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Sony Magnesium Cases = too soft?? - Page 3

post #31 of 36
On a side note, I read that Sony charged more for its magnesium minidisc r90 than it did for its aluminum r91... because it weighed less.
I honestly wish I new more about this magnesium scratching issue before I purchased my nomad mg, d-ej01, and mz-e900. Magnesium alloy casing was one of my main positive points about each of those items!
post #32 of 36
Are you really questioning that? In the real world (where people don't use the D-25s as their portable CD player) lightness is a virtue in portable players. I can see how shaving off the ounces would really be a selling point for an MD player.
post #33 of 36
I agree somewhat, but then everything would be made of some plastic wouldn't it (for weight)? Or is that another one of my misconceptions?
post #34 of 36
Magnesium is about 30% lighter than aluminum.

But the main advantage in this situation is that it molds very well.
Have you seen how thin the MD cases are? They're like 30-40 thousands thick. I don't know how they can mold aluminum that thin. Maybe it's possible.

Composites can usually not be made that thin.
post #35 of 36
Quote:
Originally posted by utdeep
I agree somewhat, but then everything would be made of some plastic wouldn't it (for weight)? Or is that another one of my misconceptions?
Plastic has a very low modulous of elasticity. So thin plastic stuff is usually flimsy unless reinforced by something else. Either a metal chassi of some sort, or you can make composites. Composites are plastics with glass or other fibers inside of them.

Bigger plastic parts can be sturdy, because of reinforcing ribs and larger cross sectional areas.

So if you want to make something really thin and stiff, a metal is usually superior to plastic.
post #36 of 36
Quote:
Originally posted by gaineso


What is referred to as Comercially Pure Titanium comes in 3 grades and is a very practical for many applications from consumer products right up to hot gas bypass ducting like we manufactured for various Boeing airliners. There are also many exotic, "super alloy" Titaniums, such as 6Al-4V which can have tensile strength of over 200 000 PSI.

3/2.5 is the other commonly used alloy which has a bit more resilience than 6/4. There is a lot of lower grade ti being imported from Russia and China. Caveat emptor of you are buying a ti object where strength is a main factor. Doesn't the US make the highest grade ti in the world?

Ever throw a VW case in the fire?
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