ejant

I only have up cut spiral bits.

The down cut spiral bits are more for finish work.

Is there a noticable difference between the two and does it pay to have both.

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BobandRick

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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reible

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

ejant

I've been doing some reading on the spiral bits. The downcut bits are excellent for inlay work give a nice clean edge.

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viper1

Also great for plywoods or any wood that splinters easy on the surface.

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