Another veneering question

[No skills]

Seems a popular subject at the moment

When veneering plywood I understand its good practice to veneer both sides (please correct me if wrong!), my question is does the veneer being applied need to be the same thickness on both sides of the ply?? There would be a fair bit of difference in what I want to do - 0.6mm on one side and about 3mm on the other - recipe for disaster or not a problem?

Thanks as ever for words of wisdom...

 

[barkwindjammer]

Not an expert by any means, but Plywood is a series of veneers, so it shouldn't matter if you 'balance' veneer or not

 

[caroleb]

I am no expert either, and am new (so hope I am not speaking out of turn - greetings all), but is plywood not made of an odd number of layers in order to balance the sheet as a whole? In which case veneering both sides may be necessary? I should like to know, as I am not sure.
Thanks

Caz

 

[Chrispy]

Its considered best practice to veneer both sides of boards with similar veneers/woods to prevent bowing, this is caused by both the glue used shrinking as it dries and the veneer drying out, but if one of the veneers is 3mm thick its more like solid wood and is going to react differently one would think when it wants to move it will be very forceful and take a lot of controlling.
That said you have not indicated how large or thick the panel is, if small and thick then may be ok if large and thin be very careful, large and thin are relative of coarse.

 

[RogerS]

Just to give you some idea of what happens when you don't put a balancing veneer on (NB...This was planned BTW). The curve happened within days of taking it out of the vacuum kit


And, yes, I think you could well have a problem with two differing veneer thicknesses.

 

[Ian]

0.6 on one side and 3mm on the other would asking for problems - although might work with epoxy resin. As others have said it should be the same thickness and if possible same wood and veneered at the same time.

But even when balanced the drying has to be equal to both sides so best to dry so the air can get at box sides at the same time.

Ian

 

[No skills]

Gentlemen, I appear to be on a hiding to nothing with this one. Thanks for the information =D>

8)