Hello, Anthony! You wrote on Tue, 04 Jul 2006 17:19:42 GMT:
??>> Hello, All! ??>>
??>> Please correct me if I don't get the terms right, English is not my ??>> first language! ??>>
??>> On a vertical mill, which is the preferred shape of the moving Z-axis ??>> "collumn?" - square / rectangular or round and why? ??>>
??>> Your input will be appreciated ??>>
A> Too vague in your description. Is the entire column on linear rails, A> box ways or other moveable members, or is it a fixed column with a A> moveable quill within the housing?
Basically a square or round fixed cast iron housing with a quill moving up/down. Spindle motor inside this quill.
Quill is aligned within the cast iron housing by 8 adjustable preciscion bearings. What concerns me is resistance to torsion and vibration, but I guess the bearing system will determine most of that.
From what has been answered so far it seems pretty 50/50. I would prefer a round quill for ease of machining.
You've probably guessed that I'm constructing a cnc mill.
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