Planer snipe risk
Snipe is the deeper cut at the leading and trailing edge of a board run through a planer or jointer. It's caused by the cutterhead engaging before the workpiece is fully supported. Most "fixes" are workarounds; the real fix is mechanical. This calculator scores your snipe risk based on machine condition and technique, then points you at the right fix.
Risk check
What actually causes snipe
Snipe happens when the cutterhead engages a workpiece that's not fully supported. The wood lifts (or dips) under the cutting force, and the cutter takes a deeper bite. Three things reduce snipe:
- Bed alignment — the infeed and outfeed tables must be exactly coplanar with the cutter bed. A 0.005″ mismatch is the difference between clean and visibly sniped.
- Pressure bar / roller geometry — a properly adjusted pressure bar holds the board down just before and after the cutter. Most snipe is here.
- Sharp, balanced blades — dull or unbalanced blades cut harder, increasing the lift force.
Most "snipe prevention" tricks (feeding sacrificial boards, supporting by hand) just cover the symptom. The mechanical fix is the right answer.
Why helical cutters snipe more
Helical / spiral cutterheads have many small cutting edges arranged in a helix. Each edge engages progressively, which is great for tear-out, but means more edges are contacting the wood at any moment. The lifting force is higher, and the snipe window is longer. The calculator accounts for this with a small score bump.
Limitations
- Score is qualitative. Real snipe is also affected by wood species, moisture content, and grain — none of which the calculator models.
- Doesn't distinguish between planer and jointer; they share the same physics but different mechanics.
- Recommendations are general — your machine's manual may have model-specific advice.
- Doesn't predict tear-out at edges (a separate problem).
Frequently asked questions
Will feeding sacrificial boards before and after fix it?
It hides the symptom — the snipe goes into the sacrificial board, not your workpiece. If your planer is properly adjusted, you don't need sacrificial boards. If it isn't, sacrificial boards save your workpiece but leave the snipe in the planer.
Does snipe get worse as blades dull?
Yes. Dull blades need more force to cut, which means more lift on the workpiece. A freshly sharpened planer cuts cleaner at the same depth setting. If your snipe has been getting worse, the blades are likely due.
Should I just buy a helical head to fix it?
Helical heads are excellent for tear-out, but they don't fix snipe on their own — they actually tend to make it slightly worse due to higher per-engagement forces. The right order is: align the bed, set the pressure bar, then consider a helical head for finish quality.