There are countless methods of doing this.
What we found to be the easiest for most work
is just two-sided carpet tape. Of course, a
better means is to mechanically hold the work,
with a vise or clamps, etc. A vacuum table could
be used as well, made with some MDF and a
shop vac as a vacuum source. When using an
MDF table you can screw right into it, to hold
fixtures, vises, vacuum- tables, etc.
The cast
aluminum table options with tapped and
reamed holes makes this much easier.
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