>I know the best to the worst is :
>forged, machined, cast.
I assume you are speaking in terms of strength. In general, you are right.
>But, where does extruded fit into all this?
>is it classified as a form of forging?
No. Extrusion is a discrete process. Squeezing the toothpaste tube gives you an extrusion. Most AL bar stock...the basis of "Machined from billet" parts that all the hot rod supplers tout...is extruded.
>is it better than "sandwich" forging?
I never heard of "Sanwich" forging. Sounds like a maketing department innovation.
>does the "grain" of the forge affect strenth >like lumber?
>does the grain of the extruding afect the >strenth?
To some extent.
>doesn't everything begin cast, forged or >extruded?
If you go back far enough.
>When someone says machined is assumed cast or >forged?
Could be machined from extruded bar stock.
>Don't nearly all forgings need machine work >before they're doen anyway?
Other than railroad spikes and jack handles....pretty much yes.
OMcG
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