Upcut vs downcut bits

what is the best bit för cutting pocket
downcut or upcut bit ?

It all depends on what the pocket is going to be for.
An upcut bit will have a tendency to tear up the edge of the pocket.
A downcut bit will give you a clean edge because it is cutting down instead of up.
However a downcut bit will also have a tendency for the cuttings go into the pocket as opposed to the upcut bit will have a tendency to lift the cuttings up and out of the pocket.

so you say it preferable to use downcut ?

depending on the material you are cutting. Downcut is generally used for wood

It´s Mahogany wood

I would use a downcut bit as the upcut tends to tear the edge of wood.

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