Re: [CAD_CAM_EDM_DRO] machine accuracy (was Resolution and surface finish)

When building from the ground up you might want to keep in mind a few more
points then:

Quality of the spindle being used:
How concentric are the bore and bearing diameters?
Is the spindle bore parallel to the centers of the bearings?
What bearing quality is to be used?

What kind of tolerance per foot is acceptable for squareness between the X,Y
& Z axis. This must be set on the ways AS WELL AS on the spindle itself.
Final checks for spindle runout shouold be made with the spindle in up and
down position.

What kind of tool holders are you going to use? An old retired machinist
once told me ...and showed me... that solid tool holders are much better
than slotted ones. The slotted ones (like many use for R8 tooling) will
have a tendency to let the tool slip in the tool holder when under heavy
loads. This can cause the tool to "dig in" during a cut leaving the milled
surface not only rougher than it should be, but the cut may wind up being
not parallel to the cutting surface.

Smoke