Replies

1. 
   RMillard | Feb 26, 2004 03:13am | #1

   I've always heard that both sides must be of the same species, but in my opinion this is really just a wives tale. It is, actually the glue line that causes the "pull". I have veneered sides of a panel with different species, with no problem as long as I do it in the same session. Your situation is even more predictable since you're working on a plywood substrate, were I usually work on a solid wood substrate.

   Rob Millard

1. 
   b1gcountry | Feb 27, 2004 01:10am | #2

   I agree. You will have even less chance of problems because you are using it in a frame and panel.

   Tom

2. 
   DaveHeinlein | Feb 27, 2004 01:42am | #3

   Just make sure you orient the veneer grain perpendicular to the face grain on the ply. This will continue the balanced panel.

   I doubt there will be much conflict between the Maple&Walnut if both are sawn pretty much the same(flat cut vs. quarter cut).

1. 
   k9s | Feb 27, 2004 05:30am | #4

   Thanks for the replys. I'll remember to orient the plywood outer plys to the veneers and finish both sides the same.

   Thanks again

3. 
   Telemike | Feb 27, 2004 08:28am | #5

   I'd try to use woods with similar shrinkage and expansion properties for the inside and outside. I'm not sure what to use to balance walnut, but some of the references can help, especially Bruce Hoadley's "Understanding Wood" or you could ask Jon Arno. I always use the same wood on each side, but any wood will be better than none. I've tried veneering only one side (and ignoring some other old wisdom) and the old wisdom always wins.

4. 
   JohnWW | Feb 28, 2004 01:20am | #6

   Just by luck, soft maple, walnut, and lacewood all have identical tangential (flatsawn) shrinkage, ( .0027 per inch per 1% moisture content change) so mixing the species with flatsawn veneers shouldn't give you trouble.  Given the thinness of the panel and a sturdy frame it wasn't all that likely you would have trouble in any case, but it never hurts to be cautious.

   If you mix flatsawn and radial (quartersawn) veneers you will have distinct differences in rates of movement, soft maple is .0012, walnut is .0019, and lacewood is .0009. 

   These numbers are from the Lee Valley wood movement reference guide.

   John W.

    

1. 
   k9s | Feb 28, 2004 05:51am | #7

   John--There will be two panels aprox. 15"wide x 38" tall each with grain running vertically. Computes to approx .o4 movement each panel. I'm in Southern California area with minimal humidity so I think I'm save. Thanks for the specs.--Bruce