Join Date: Mar 2017
Location: Lafayette, Colorado
Lyptus and hard maple
I usually don't try to glue dissimilar woods together because of the mismatched expansion factors. However, I have some dark lyptus that would look really nice contrasted with some white hard maple on a project I'm doing. I want to glue a length 6 inch 1.25 inch wide of hard maple to a matching piece of lyptus. Are the coefficients of expansion so different that the bonds will break or something else bad happen? I am finishing both with polyurethane.
I know most of the contraction/expansion (due to moisture) is in the cross grain direction. I will, therefore, have 1.25 inches of cross grain expansion differences between lyptus and the hard maple. Both are hard woods.
The woodworking database says:
Lyptus Shrinkage: Radial: 8.2%, Tangential: 12.8%, Volumetric: 21.0%, T/R Ratio: 1.6
Hard Maple Shrinkage: Radial: 4.8%, Tangential: 9.9%, Volumetric: 14.7%, T/R Ratio: 2.1
These seem too different to be safe.
Last edited by Noumenon; 03-09-2017 at 06:10 PM.
Reason: more clarity