Dovetail Question

[Rich Torino]

When should you use a 8 degree dovetail bit over a 14 degree bit or visa versa? Is there a structural reason or is it just aesthetic?
thanks....

[Jerry Strojny]

I'm no expert, but I believe it depends on the thickness of the wood. Thinner (1/2", 3/4") would typically be 14 degree. Thicker ones would be the lower angles.

Maybe someone else will chime in with a more difinitive answer for you.

[Cliff Rohrabacher]

All dovetails have an issue with end grain and crossgrain. Both will serve to weaken a glue joint.
The more accute the angle the more end grain is exposed.

A more accute angle will also produce a probability of a weaker joint by virtue of the mechanical forces and the grain pattern. This because of the increased risk of shearing along the grain at the intersection of the tials and pins.

[Mark Singer]

This is a very strong joint! The 8 degrees is close to the 8 to 1 ratio that is traditional for hardwoods....6 to 1 for soft woods. The compession of the wood is the difference.

[Rich Torino]

Mark
would it then be correct to assume that you could used an 8 degree bit for just about all DT joints ,thru and 1/2 bilind ,and end up with a strong, aesthetic pleasing joint???

[Jim Becker]

Aesthetics aside, not all jigs will work with different bit "degrees"...check yours out before you buy. Some will only work properly with a 14 degree 1/2" bit...