*Thanks Jon, I'm going to try even more alloys and more cutters to see if I
can find the problem . . I'll chase my chatter-slack some more as well to
get this thing as rigid as possible.*
*Curious, can this thing EVER cut mild steel?*
On Mon, Mar 1, 2010 at 7:18 PM, Jon Elson <elson@...> wrote:
> Maybe. If you are plowing full width with a 1/2" end mill, and going
> 1/4" deep per pass, yes, I think you are expecting way too much for a
> lathe milling attachment. With a very rigid setup, I can just barely do
> this on my Bridgeport, which outweighs an Atlas/Craftsman lathe 10:1.
> If you can't make any decent cut with .050" depth, and maybe just
> milling on one side at a time, then something is wrong.
> You need a rigid setup, make sure you are feeding the workpiece AGAINST
> the rotation of the cutting edges, and make sure the aluminum is a
> machinable alloy. There are a number of aluminum alloys, generally the
> softer ones, that do not machine well - they deflect and tear rather
> than slice. Make sure the aluminum does not get hot. It is MUCH better
> to take shallow cuts and keep the feed moving rather than take one deep
> cut, slowly.
> Watch out for the overhang of the workpiece from the cross slide. If it
> can rock, even a little, it will perform horribly.
[Non-text portions of this message have been removed]