Re: rf-45 clone out of box accuracy..
- --- In firstname.lastname@example.org, philr_77378@... wrote:
>The head left-right (normal to X axis) rotation doesn't address nor
> The RF-45 has a provision for adjusting the tilt of the head from
> right to left.
compensate for column dynamic alignment to the table. If the column is
out of square the spindle centerline will drift in the X and/or Y plane
as the head travels along the Z axis.
The only compensation which can be accomplished by rotating the head
is to bring the spindle (not column) into square relative to the table
X travel. I've seen some also suggest shimming the head rotation ways
to bring the spindle into square relative to the table Y travel.
Again this does not address nor compensate for column alignment
relative to the Y axis.
This matters in the case column travel will be used as the active Z axis
rather than use of spindle travel for the same. Assuming the spindle is
otherwise square in both X/Y to the table I can see compensation for a
simple linear out-of-square column to be possible in a CNC scenario.
But my primary motivation here was to understand how existing owners deal
with column alignment on this mill. I've seen pictures from those who have
separated the column from base revealing some fairly horrific factory hand
grinding of the column + base mating surfaces. I'm wondering how such
methods could even come close to creating acceptable factory column
alignment, and moreover mating surfaces with sufficient contact area to keep
the alignment stable particularly given the subsequent boat ride.
This is a new mill which I'm trying to decide whether to keep and live with
its limitations or return to Enco. And while they are obligated under
existing warranty to bring this into "factory specifications(*)", I can't
foresee the long term burden of keeping an RF-45 clone in tune. I'm trying
to get some sense of this from those with experience owning this mill.
(*) the factory test report is laughable. Every report I've seen for
individual tolerance inspection of this mill has contained the exact same
measurements, hand copied onto the sheet accompanying the respective mill.
Enco didn't really have any comment when I pointed this out.