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No, in some contexts the French "arbre" (tree) means "shaft" or "axle", as in "arbre de transmission" ("drive shaft", according to Google T). I doubt you could find a correct English translation using "tree", but I'm no mechanics expert.
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Thanks, FlorenceA - I just checked, and I was definitely confused, and now I can't find in my head the word I thought I was thinking of...
But I did find my old 1941 book _How to Run a Lathe_ - and on the first page is shows a "tree lathe" -- a tree trunk horizontal between two trees, with a rope wrapped around the trunk that goes up to a flexible branch. Presumably you slowly wind the rope, pulling down the branch, then release it and do your work while the trunk spins. I guess that is, indeed, a 'shaft'
