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Veneered table top substrate

T

Tinman

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I am about to make a circular dining table with a veneered top. The top will be 1370mm/ 54 inches diameter with a 24mm thick substrate veneered with 2mm bandsawn veneers in a starburst pattern, The edge of the table will be fully lipped. I have attached an image of a smaller coffee table I made previously.
I would like the top to be structural so that I dont need to use an underframe as per the coffee table
My concern is that standard MDF or Birch ply substrate is only 1220mm/ 48 inches wide and so I will have to join it and the joint line will show through the veneer. So I have a couple of questions
1. Is the substrate joint likely to show through?. I could run the joint through the centre and then align the veneers so 1 of the edge joints is aligned with a veneer joint
2. I could use jumbo size sheet material (1500 X 3000mm) but this is difficult t obtain expensive and wastefull as I would only use half a sheet although I could use 12mm and laminate the sunstrate up from 2 thicknesses
3. I have some 1.5mm birch ply in 1525mm squares so I could make the substrate up from 1220mm /48 inch with a joint, apply thin ply to each face and then veneer each face

Any suggestions would be appreciated
Ian
 

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If you join the substrate and use 2mm thick bandsawn veneers, the join line almost certainly won't show. If you were to to use 0.6mm wafer thin commercial veneer it would almost certainly telegraph through. The best way to check is to do a trial using small bits of substrate joined together and veneer each - Rob
 
I know it's decades ago, I know, but I used to sell plywood at 60" wide back in the 1960s; 50x60, 60x50 and 60x60. So I just did a google at 150cm ply and it is still available in 18 and 25mm 10' x 5' sheets. It's not birch ply, I haven't googled that far. At that price that might be the cost of peace of mind that no joint will rise.
 
Malc2098 said:
I know it's decades ago, I know, but I used to sell plywood at 60" wide back in the 1960s; 50x60, 60x50 and 60x60. So I just did a google at 150cm ply and it is still available in 18 and 25mm 10' x 5' sheets. It's not birch ply, I haven't googled that far. At that price that might be the cost of peace of mind that no joint will rise.
Click to expand...
Chances are though Malc, the ply at those widths won't be flat which ain't a lot of use.

I remember a table with a starburst pattern, about the same size, being built in the firm I used to work for and as I recollect, the substrate would have been a top grade mdf but with a substantial under frame to stop the top from drooping....which it will inevitably do if mdf or a similar substrate is used - Rob
 
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