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Qtr Cut Veneer Over Flatsawn3/20
I want to put 1/16" qtr cut sapele veneer over 3/4" solid flatsawn sapele. The grain on both run in the same direction. Do I need to put another ply in the middle in the opposite direction? I was thinking that with the species being the same, the grain running in the same direction, and the veneer being 1/16" that wood movement would not be an issue. Am I correct?
No, you are not correct. With or without a crossband, that is a very unbalanced construction. You have 1/16" on one side and 3/4" on the other and a wet glue-line in between. I don't believe that construction has any chance of coming out flat and stable.
I agree with John. I would run the qtrs. perpendicular to the plain sawn on both sides. If thickness is an issue, sand the 3/4 down. But balance construction is key. Woodwork 101.
I would recommend putting the same veneer on both faces of the 3//4" stock. Balance seems to be the rule, even though both woods - veneer and solid have grain running the same direction. The response to RH change would be different on one face than the other, if only one side is veneered.
If you choose to crossband, then do the same on both sides.
I would add that things are different if the solid wood is 4" wide, or 40" wide. You can get away with more on narrower stock than you can wide.
Why not use solid quarter sawn for the part