Picture a standard book case; 38" high, 20" deep and 48" wide. Material is 3/4" maple venered plywood - actual thickness measured at 21/32".

My calculations on the shelf widths were as follow:

One dado on the center line (width) means that the shelf widths ought to be:

21/32 = .65625

1/2 the center shelf is .328125

.65625 + .328125 = .984375

24" - .984375 = .23015625

now add 1/2" of dado depth (1/4" both sides) and we get 23.515625

I cut the shelves to 23.5" and the whole unit when assembled was 1/4" too long. The joints look tight. I've verified shelf cut width and dado depth (set with a gauge)

So where did I go wrong?

TIA for your help, Curt

My calculations on the shelf widths were as follow:

One dado on the center line (width) means that the shelf widths ought to be:

21/32 = .65625

1/2 the center shelf is .328125

.65625 + .328125 = .984375

24" - .984375 = .23015625

now add 1/2" of dado depth (1/4" both sides) and we get 23.515625

I cut the shelves to 23.5" and the whole unit when assembled was 1/4" too long. The joints look tight. I've verified shelf cut width and dado depth (set with a gauge)

So where did I go wrong?

TIA for your help, Curt

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