Re: Dimensional Accuracy - Aluminum vs. Titanium
I think the_gentlegiant's response was fairly insightful.
If you hadn't worked out why a 1/8in tool in a hard material deflected more than a 1/4in tool in a soft material, then it's reasonable to think you don't know a lot about machining. Knowing that a larger tool will deflect less is very basic.
Use the largest diameter tool, with the shortest flute length and the shortest stick out that you can.
7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)