Most plywood waste is not caused by bad cutting. It is caused by laying out parts in the order they appear on the drawing instead of the order the sheet wants them. This is the method we use on every Northpine plan before the DXF is generated.
1. Grain direction is a constraint, not a preference
On a plywood cabinet the face grain runs the long way on sides, top and bottom, and across on the back. Write the grain axis next to every part before you place anything. Once that is fixed, roughly half of the possible layouts are already gone — which is good news, because the remaining search is small enough to do by hand.
2. Count the kerf twice per part
A 1/8 in blade removes 1/8 in on every pass. Two parts sharing an edge cost you two kerfs, not one, so a 96 in sheet gives you about 95.6 in of usable width after the first rip. On a 24 in cabinet that is the difference between a 22.5 in top and a 22.25 in top — enough to throw the carcase out of square when the dados land.
Write the usable area at the top of the cut list: 95.5 × 47.5 in for a nominal 4×8 sheet. Everything gets planned inside that rectangle, never the printed one.
3. Reserve the grooves before you nest
Dados and rabbets do not consume extra material on the sheet, but they do consume width on the part that receives them. A 3/4 in dado in a 16 in side panel leaves 15.25 in of face — and if that side is also the outside of the cabinet, the grain has to stay vertical. Reserve the groove allowance with the part, not after it.
4. Cut long parts first, then fill
The natural order that wastes least:
- Rip the full-length parts (sides, back) off one edge. They are the only parts that need the full 96 in.
- Crosscut them to length and set them aside — they are now off the sheet and cannot be clipped by a later pass.
- Fill the remaining strip with top, bottom and shelves, all of which are shorter than 48 in.
- Cleats, stops and jigs come last, out of the offcut column. If they do not fit, they were never really part of this sheet.
5. The offcut is a part of the plan
We draw the remainder on the nesting map as a labelled zone with its own dimensions. A 14 × 48 in strip is a future set of shelf stops, not trash. If your plan does not tell you the size of the offcut, you will treat it as trash and cut it up for spacers.
6. Dry-run the layout with chalk
Before the first cut, lay the parts out on the sheet with a chalk line and measure the two diagonals of the whole group. If they differ by more than 1/8 in, the layout is not rectangular and something will not fit. This takes four minutes and saves a sheet.
What our own cabinet takes
The 24 × 16 × 36 storage cabinet is two sheets at roughly 64 percent yield: sides and back on sheet one, top, bottom, shelves and cleats on sheet two, with a usable strip left over on each. That yield number is printed on the nesting sheet so you can compare it against your own stock before you buy.
The four numbers to write down
- Usable sheet: 95.5 × 47.5 in after edge trim
- Kerf: 1/8 in, counted twice per shared edge
- Actual stock thickness: measured, not assumed (3/4 in ply runs 17.5–18.5 mm)
- Grain axis per part: long or across
Everything else is arithmetic. If you would rather skip the arithmetic, every Northpine plan ships a nesting map with those four numbers already applied.