Anelok: a dummy case for AAA (2/2)
werner at almesberger.net
Sun May 24 00:00:21 UTC 2015
This all looks nice so far. However, the path to get there turned out
to be a lot stonier than I had expected. The problem is that my mill
is acting up badly along the Z axis, reducing the depth by up to
almost half of what the CAD model says.
Here is an example. This is what the slices look like in FreeCAD:
And this is what came out:
The nominal thickness of 17.5 mm yielded pieces between 9.3 and 10.3 mm.
The jump from ~10 to ~9 mm may have been caused by setting the depth of
the bottom such that the mill would cut well below the floor of the upper
MDF block. By the way, double-sided adhesive tape and MDF form an
amazingly strong bond, making it quite an effort to pick the slices from
the block after milling.
The depths of the cut-outs for screw heads are even more puzzling:
Nominal Measured Factor
--------------- --------------- ---------------
5 mm 3.7-4.0 mm 74-80%
8 mm 5.0 mm 63%
10 mm 5.6-6.3 mm 56-63%
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