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· The Router Guys
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Downcut spiral bits push the cuttings into the cavity or away from the table on a tablemounted external/internal routing. I don't own any. Maybe someone else can shed some light on the value of owning them.
 

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Down spiral has the "edge" on the top surface (router side) coming out nicer, less splinters (think thin veneer). I've used it only as a through cutter, when hand held it makes it easier to see what is happen as the chips are taken away from the router.

They also make a compression up and down spiral bit that cuts down from router and up from the bottom side...... I don't have one of these.........

Ed
 
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