Material thickness. When you are
processing the last few millimeters of
the cut line there may be too much
radial force on the part. This will
invariably drag the part towards the
tool, damaging both in the process. If
the material is thick (10mm or above)
then this will increase the chance of
the part moving.
Swarf or chips. Any debris between
your material and the sacrificial bed
will create an uneven surface and allow
vacuum leakage, reducing your hold
In order to avoid movement, you
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Sacrificial bed continued...
the T-slots. This ensures the bed is
flat and allows the surface to be
A mechanically fixed sacrificial
bed typically has a longer lifespan.
A fixed bed allows operators to
re-skim the surface and cut in a
clean working area. After skimming
the bed, the accuracy of the Z axis
is more reliable and provides high
quality cutting and precision.
If the surface is skimmed by
0.2mm on a weekly basis, we recommend the MDF bed is replaced
after six months. The core of the
MDF can become “furry” making
it difficult to hold smaller parts at
the end of the cutting process. If
the CNC router is predominately
processing larger components, the
hold-down will be acceptable for a
further six months.
Replacing your mechanically
fixed sacrificial bed is relatively
straightforward and should take no
more than a few hours to complete.
Make sure there is no swarf or debris between the aluminum vacuum
deck and your new piece of MDF.