If you want to make sure that at least the top is chip-free, a spiral DOWN
cut bit would be ideal.
If you want BOTH sides chip-free, a spiral compression bit would be ideal.
In the case of a router table top, you should only have laminate on the top
side. If you are using melamine, the bottom won't matter anyway.
Keep in mind, you can always use a down cutting blade in a jig saw too.
That's how most sink holes in kitchen and bath countertops are cut.
Bosch makes a T-Shank blade part number T101BR. The "R" stands for reversed
tooth. It cuts on the down stroke rather than the traditional blade which
cuts on the up stroke.
DeWalt makes them in a universal shank for conventional jigsaws which take
the universal shank blades.
You can find them wherever cabinet guys buy their tools. All the laminate
guys that I know use them.
Hope this helps.
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