Re: Newbie: Two halves not aligning properly : part 2...long again

Thanks to all that have replied so far.
I tried to keep the original posting as short as possible but still
convey my delima.

The material I am testing/learning with are blocks of wood that I have
planed, squared and joined the edges of.
Granted this is not the best case scenario, but it's cheap and I can
burn the scrap this winter in the shop (I can hear the die hards now
complaining about getting sawdust on the ways....so please don't go
there in this thread ;-) )

I am using a .375" drill bit in a collet (not a chuck) for the index
holes.
I am using a .25" router bit in a collect as well.
I am feeding at 2 inches per second.

The depth of the drilled holes are .5"
The depth of each of the slots are .125" and I do it in one pass at 2 IPS.

The 3 randomly spaced index holes line up fine, so I don't think my
drill routines are the issue.

The milled slots are nothing special.
The horizontal slot is 4" long on the X axis only (not at an angle).
The Vertical Slot is 3.5" long on the Y axis only (again, no angles).

When the two halves are joined, the end of the slots do not align with
each other (I'll attempt illustrate this below).
XXXXXX
X X (half A)
-------
X X (half B)
XXXXXX

The above "skew" is present in both the X and Y slots.

Now that I'm looking at it and thinking deeper... It is almost as if
the table is traveling at a slight angle in BOTH directions. This
angle is then multiplied X 2 when the mirrored half is milled and then
joined with the first half.
In other words, the slots are NOT parallel from end to end.
If the first end looked like the above cude illustration, the the
other end of the work piece would look like the below illustration.

XXXXXX
X X (half A)
---------
X X (half B)
XXXXXX

So even though I indicate the edge of the work, it appears that maybe
the machine is indeed off and the X axis and Y axis are not traveling
at perfect right angles to each other...
Does this sound probable?
I'm off to investigate further..
Thanks!