The Woodwork Bench / Field notes & guides
How to read woodworking plans: dimensions, cut lists and assembly order
A woodworking plan is a set of instructions, not just a drawing. Read the whole document once before buying materials: the first drawing may show finished dimensions while later pages reveal stock thickness, joinery and assembly constraints.
Start with the overall drawing
Find the front, side and top views. The front view shows width and height; the side view reveals depth; the top view helps identify how parts meet. If a dimension is missing, do not scale it from a picture: illustrations may not be drawn to scale.
Mark the overall width, depth and height on a separate sheet. Next mark every part that determines those dimensions, such as legs, shelves and rails. A 600 mm-wide shelf sitting between two 18 mm sides needs a different cut length from a shelf that sits on top of them.
Understand nominal and finished sizes
A merchant’s named timber size may not match the actual measured size. Measure the material you buy and use that actual thickness in the cut list. This matters most for parts fitted between other parts.
For example, an outside width of 600 mm with two 18 mm side panels gives an internal shelf length of 600 − 18 − 18 = 564 mm. If the stock is actually 17 mm, that becomes 566 mm. Do not cut all the internal parts before checking.
Read the cut list as a manufacturing plan
A useful cut list names each part, quantity, finished length, width and thickness. Add a column for grain direction, one for edge treatment and another for whether the part should be cut oversize for trimming.
Example: two sides at 300 × 180 × 18 mm; one shelf between them at 564 × 180 × 18 mm; one back rail at 564 × 60 × 18 mm. This is an illustrative exercise, not a load-rated shelf design.
Check assembly order and tolerances
Dry-fit before glue. A joint may be accessible before a back panel is installed but impossible to clamp afterwards. Mark which faces should be flush, which edges remain visible and which screws must avoid other fixings.
Before cutting, write down unanswered questions: Is the drawing dimension to the outside face? Is a measurement before or after sanding? Are fasteners included in the plan? Does the design need wall fixings or anti-tip restraint? Resolve those questions before spending money.
A pre-cut checklist
Confirm the project fits its intended space; measure the timber; identify the reference edge and face; check that the cutting tools can safely perform each operation; and test one joint on scrap.
If the plan omits important dimensions or the assembly order cannot be reconstructed, choose a better plan. A large library is not a substitute for clear instructions.
Check a drawing before buying timber
Read the title block, units and revision information first. Compare overall dimensions with the sum of individual parts, then note every measurement that depends on the actual stock thickness. If a drawing shows only a perspective view, ask for orthographic views or a clearer cut list before committing materials.
Make a one-page build sequence in your own words. Mark which operations must happen before assembly and which dimensions are critical to fit. A clear plan should make those decisions easier rather than forcing the reader to invent them.