When to Use Spiral vs. Straight Router Bits

What's the difference between an up cut router bit, down cut router bit and straight router bit? Nick shares his tips for when you would use each router bit.

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[adama]

And then there is the combo down and upcut router bit that will compress the fibers on both sides. Those can get pricy though.

[busy]

I tried using a straight pattern but on a cane handle, using a template. It was a violent explosion of wood. Took a big chunk out of the curved handle. Doesn’t work routing into the grain of a curved surface.

[burgenah]

I have a crafty project: cutting out silhouettes from 1/2" plywood, for haloween decorations that get painted black and back lit and placed against the house. Last year, I used a jigsaw. This year I was thinking of trying a router and bit. I came here to find info about the difference. But alas, still a bit confused. Would you recommend a Spiral (up cut or down cut) or a Straight bit to cut shapes (cutting completely through the wood) out of my 1/2" plywood? Thanks!

[ZopcsakFeri]

So why is it not good to cut Melamine and MDF or rabbets / dados with an upcut bit?

[ronhall]

I just purchased my first router ….. never used one in my life and know even less. I process all information, because, I’ve never used a router in my life!