Re: doubling resolution strategy # 2

Jon,

This is exactly right! However, if parts are the end result, then
the end result needs checked... These forces and issues will, as you
say, "swamp" machine accuracy. That is precisely why I mentioned
doing the test parts; if you can't get consistent parts, it may not
have anything to do with the machine, per se. Could be the chosen
feeds/ speeds/ tooling/ toolpath.

Point is, if you CAN'T make what you need to make, then you NEED to
find out why; but if you CAN make what you need, then WHY you can is
an academic exercise... Better to spend your time making the parts,
and optomising your techniques, which will probably eventually put
you in the position of needing to know just what the machine is
doing. Finding out at that point will teach volumes!

Ballendo

Who recommended test parts AFTER checking the machine, if possible.

>This is much harder, as the cutting forces cause all sorts of
>deflections in the cutting tool, the workpiece, and the machine
>itself. Also, when cutting, there are thermal effects in the
>workpiece, and the machine - especially in the spindle housing.
>Using the wrong tool in the wrong place can easily cause tool
>deflections that swamp any other machine inaccuracy.
> Jon