Base for spoilboard 5X8

[bstern]

I am in the proess of stretching my bot from 4X8 to 5X8.

The setup I have now is an azek plenum over a 3/4" ply base.

I am told 3/4 ply is not available in 5X8.

I could bolt on a 12" piece or use somthing else.

Any sugestions?

[wberminio]

Bob
Hardwood plywood is available in 5 x8 check with a good hardwood plywood
distrib. not a standard lumber yard.

[ken_rychlik]

5x10 plywood is also avaiable at my supplier, but you will have to find a hardwood type of supplier in your area.

[cabnet636]

i see you are in charlotte call a&m supply ask for david!

[dlcw]

Bob,

I used 2 layers of 60x60x3/4" baltic birch plywood laminated together to build my plenum. I laid out a full sheet then a half sheet, then overlapped a full sheet over the seam and another half sheet to get everything sized properly. I used a couple of sheets of 3/4" MDF along with a bunch of weights to use as "clamps". When drying was domplete, I surfaced the plenum and then carved the plenum channels, sealed the plenum with about 5 coats of spray-on shellac and added a spoil board. This setup gave me a good mounting base to add my vacuum motors without any chance of sagging or distortion from vacuum motor weight.

This setup has been working for 18 months with no problems.

[Gary Campbell]

Bob...
I did mine similar to Don, but in the other direction. I used 4 x 10 MDO (actually 2) and used a 1/8" full length spline between a 12" rip that I added on. I put the splice under a fully glued plenum.

[gundog]

I am in the proess of stretching my bot from 4X8 to 5X8.

The setup I have now is an azek plenum over a 3/4" ply base.

I am told 3/4 ply is not available in 5X8.

I could bolt on a 12" piece or use somthing else.

Any sugestions?

Sorry to get off your subject but I am interested in how you are stretching your table to 5' wide? I have been wanting to do this for a while SB gave me an estimate of $3300 I felt that was too steep. I have been thinking about just buying the extrusion and doing the rest of the table by either extending what is there now or making new x braces all together.

Mike

[frank134]

I did mine with a 5 x 10 sheet of birch plywood and then 5 x 10 mdf I got it from DSI .