How to Set Jointer Depth of Cut for Softwood
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Contents
What depth of cut means
On a jointer, depth of cut is how much material the cutterhead removes from the face or edge on each pass. It is controlled by the height of the infeed table relative to the outfeed table. A deeper setting removes stock faster, but it also demands more from the machine and makes tear-out, snipe, and uneven results more likely.
For most softwood work, start at 1/32 inch per pass. If the board is wide, knotty, damp, twisted, or your jointer has a small cutterhead or modest motor, start closer to 1/64 inch. A clean, straight, narrow board on a stable machine may tolerate 1/16 inch, but there is rarely a good reason to begin there.
Choose a starting setting
Softwood is not automatically easy to joint. Pine and spruce can be low-density, but their grain often reverses, and knots can be much harder than the surrounding wood. Cedar is soft but dents readily. Treat the species, grain direction, board width, and machine capacity as a package rather than relying on the label “softwood.”
| Depth per pass | When it makes sense | Main trade-off |
|---|---|---|
| 1/64 inch | Wide, figured, knotty, or delicate stock; light-duty jointer | More passes, but lower cutter load and less tear-out risk |
| 1/32 inch | Good default for ordinary softwood boards | Useful balance of stock removal and surface control |
| 1/16 inch | Narrow, straight-grained stock and a machine rated for the cut | Faster, but more likely to chatter, tear, or overload a small machine |
Do not exceed the depth your jointer’s manual permits. Machine width and cutterhead design matter: a 6-inch benchtop jointer should not be expected to handle a deep cut across a wide board like a heavier floor-standing machine. If you are choosing a machine for frequent face jointing, compare its usable width, fence support, and stated cutting capacity—not just motor horsepower. A benchtop jointer can be adequate for narrow boards and occasional work; wider stock may call for a larger machine or a different milling plan.
Set the infeed table
Unplug the jointer before adjusting or checking it. Lower the infeed table to the desired cut depth, using the machine’s scale as a starting point. Scales can be inaccurate, so verify the setting with a straightedge or a test cut. The outfeed table should align with the highest point of the knives or inserts; if it is too low or too high, the board may taper, snipe, or catch at the end of the cut.
To check the cut directly, place a straight piece of scrap across the infeed and outfeed tables. The gap between the straightedge and the lowered infeed table is the approximate depth of cut. If your machine has a dial or a digital depth gauge, use it for repeatability, but confirm it against the actual board. A precision straightedge is useful for setup checks, though a sound, known-straight edge can work for occasional adjustments.
Make a test pass and read the result
Joint a short piece of scrap from the same species and similar width. Feed it steadily, with firm downward pressure over the infeed table at the start and over the outfeed table as the board advances. Keep hands clear of the cutterhead and use push blocks suited to the jointer. Do not force the board; a slow, even feed is safer and usually leaves a cleaner surface.
After the pass, check how much was removed and inspect the grain. If the cut is clean and the machine sounds steady, repeat at the same setting or increase slightly if there is a practical reason to save passes. If you hear the motor bog down, see chatter marks, or find torn fibers, reduce the depth—often to 1/64 inch—and check that the knives are sharp and the board is supported.
Chips and shallow scallops can also point to dull or incorrectly set knives, not just an overly deep cut. On a helical-head machine, a damaged or dull insert may leave a localized mark. Rotate or replace inserts according to the manual, and never adjust cutterhead components while the machine is plugged in.
Account for grain, knots, and board shape
Look at the grain direction before jointing. When possible, feed so the cutterhead meets the grain in a way that tends to lift and cut the fibers rather than pry them up. Reversing grain can make tear-out unavoidable; lighter cuts reduce the damage but may not eliminate it. Test the less obvious face first if appearance matters.
A knot can cause a sudden change in cutting resistance and may chip out even at a shallow setting. Avoid running loose knots, cracks, or pieces with questionable support over the cutterhead. For severely cupped or twisted stock, removing too much in one pass can make the board unstable against the tables. Take light cuts and establish a flat reference face before thickness planing. A pair of jointer push blocks helps maintain control, but it does not make short or unsafe stock suitable for jointing; follow the minimum-length and guard requirements in your manual.
Know when to use another approach
If a board needs substantial flattening, do not try to remove the full cup or twist with one aggressive cut. Take shallow passes, checking progress, and stop once a flat reference face is established. A planer can then bring the opposite face parallel, usually with a sled if the board cannot sit stably on its own. For boards wider than the jointer’s capacity, use a router sled, hand plane, or other method rather than trying to balance an over-wide piece on the tables.
Softwood often compresses under heavy pressure and can dent under a push block. Use enough pressure to control the board without crushing the surface, and avoid leaning hard on the outfeed end before the board has enough support there. The best depth is the largest cut that your machine can take cleanly and safely on that particular board. In practice, 1/32 inch is a dependable starting point; use less when the grain or setup is difficult, and increase only after a test pass proves the machine and stock can handle it.
