Planer Snipe: Why It Happens and Five Fixes

You feed a board through the planer, it comes out flat down the middle, and the last few inches are a shade thinner than the rest. Run your fingertips along the face and you can feel the step. That dip is snipe, and it is not a sign that your planer is worn out or that you fed the board wrong. It is geometry. The board is held by two rollers in the middle of the cut and by only one at each end, and something has to give in that moment. What follows is the part most guides skip: there are two different things that give, they produce snipe that looks similar and behaves differently, and a fix aimed at the wrong one does nothing at all.

Snipe is the shallow dip a thickness planer cuts in the first and last few inches of a board, typically a few thousandths of an inch deep over roughly the first and last two inches. It has two causes: the cutter head lifting when only one roller is loaded, and the board itself tilting up when the ends are unsupported. Butting boards end to end and locking the head address the first. Infeed and outfeed support addresses the second.

• Snipe is a depth of cut problem, not a sharpness problem. Dull knives cause tearout, not snipe.
• One measured example on a small planer: 0.008 inch deep, over the first and last two inches of the board.
• Cause one is the cutter head moving on its columns when only one feed roller is loaded.
• Cause two is the board tipping up because the ends hang unsupported.
• Diagnose before you fix: short and even at both ends points to the head, long and variable points to support.
• Butting boards end to end so a roller is never unloaded is the fix with the least setup.
• Leave six extra inches on every board. It is the fix that always works and the one worth planning for.

What Snipe Is, and How Much of It You Are Dealing With

In short: a few thousandths deep, over the first and last inch or two.

Snipe is a section at each end of the board where the planer removed more material than it did through the middle. It is shallow. Matthias Wandel measured it on a small Delta planer and reported 0.008 inch, or 0.2 mm, over roughly the first and last two inches of the board. That is thin enough to be invisible until the piece is finished and light rakes across it, and deep enough that sanding it out by hand takes longer than you expect.

Measure yours before you go further. Set a straightedge along the face and slip a feeler gauge under it, or run calipers across the board at one inch, three inches and mid length. You want two numbers: how deep the dip is, and how far in from the end it runs. Those two numbers tell you which of the two causes you are looking at, and that decides which fixes are worth your afternoon.

The Two Causes Are Different Problems

In short: one is the head moving, the other is the board moving. They need different fixes.

Every fix list for this problem runs the two together, which is why the lists are long and the results are inconsistent. Here is the split.

Cause one: the cutter head lifts. A thickness planer holds the board with an infeed roller ahead of the cutter and an outfeed roller behind it. In the middle of the cut both rollers press down and the pressure is balanced. When the trailing end of the board passes the infeed roller, that roller runs off the board and the load on the head becomes one sided. On a small planer the head assembly rides on threaded columns with enough clearance to move a few thousandths, and it shifts. The cutter drops slightly relative to the bed and takes a deeper bite. The same thing happens in reverse at the leading end, when the outfeed roller has not yet taken hold.

Cause two: the board lifts. A long board hanging off the back of a short bed works like a lever. The overhanging weight tips the trailing end up, which raises the leading end of the board into the cutter. This one has nothing to do with the machine's internals and everything to do with what is holding the board up on either side.

The two produce snipe that looks the same to a fingertip and different to a rule.

Which One Do You Have

In short: measure how far the snipe runs in, and change one board at a time.

• Short and consistent, an inch or two at each end, the same on every board no matter the length, and the same depth at both ends. That is head movement.
• Longer, uneven, and worse on long or heavy boards, or present at one end only, and it changes when someone holds the far end. That is board lift and a support problem.

The one board test settles it. Take a short offcut, two feet or so, and run it through with a helper supporting both ends level with the bed the whole way. If the snipe is gone, the cause was support. If the snipe is unchanged, the cause is inside the machine.

Fixes for a Head That Moves

In short: never let a roller run off a board, or stop the head from moving at all.

Butt the boards end to end. Feed the next board so it touches the trailing end of the one before it, and keep a queue going. The rollers never see an unloaded moment, so the head never shifts. This costs nothing, needs no tools and is the reason production shops rarely fight snipe. Two short sacrificial pieces, at least a foot long, in front of and behind the board you care about will do the same thing for a single part.

Use the head lock. Many benchtop planers have a lever or cam that clamps the head to its columns. It exists for this problem. Engage it after setting the depth, disengage it before you crank the height. If you have owned the machine a while without touching that lever, this is the first thing to try.

Check the columns for slop. With the machine unplugged, take hold of the head and try to rock it. Movement you can feel by hand is movement that shows up in the cut. Some machines have adjustable gibs or column nuts that take up that play, and the manual will say so. Machines built with four columns instead of two have less of this by design, which is worth knowing when you are next buying rather than fixing.

Fixes for a Board That Lifts

In short: hold the ends up, level with the bed or a hair above it.

Set the fold down tables slightly high. Most benchtop planers have infeed and outfeed wings, and they are adjustable. The common recommendation is to set the outer ends about 1/16 inch above the planer bed rather than level, so the board is held down against the bed rather than allowed to rise. Fold the tables out, lay a straightedge from the bed across the wing, and turn the set screws until the far end sits that fraction high.

Add roller stands at bed height. For anything over about four feet, a wing is not enough. A stand on each side, set level with the bed, removes the lever effect entirely.

Lift the ends by hand. With no stands, apply gentle upward pressure on the trailing end as the board goes in and on the leading end as it comes out, on the order of 1/16 to 1/8 inch. Do not push the board through. You are supporting it, not feeding it, and the rollers should still be doing the work.

Feed at an angle. Entering the board at 15 to 30 degrees off square lets the rollers take hold gradually rather than all at once. It reduces snipe on some machines and does nothing on others, which is a good reason to try it before you buy anything.

The Fix That Is Not a Fix, and Is Still the Right Answer

In short: cut the ends off, and plan the board long enough that you can.

Leave six inches of extra length on every board that goes through the planer, then cut the sniped ends away at the miter saw. It is not clever and it works every time, on any machine, with no setup. Every shop that mills its own stock does this as a matter of course, and the extra length costs less than the time spent chasing a few thousandths.

Plan it into the cut list rather than discovering it at the end. If a part needs to finish at 30 inches, crosscut it at 36 before milling. For a glue up, gluing sacrificial runners along both sides that extend two to three inches past the ends does the same job for a panel, and they get ripped off afterward.

What Does Not Cause Snipe

In short: dull knives ruin the surface, but they do not cut a dip at the ends.

Blade condition is worth staying on top of and it is a different problem. Dull or nicked knives leave tearout, fuzzy grain and tracking lines down the length of the board. Snipe is a change in the depth of cut that happens at a specific moment in the pass, so it is geometry rather than edge quality. If your ends are dipped and your middle is rough, you have two problems and they need two answers.

Feed rate is in the same category. Slowing down produces a better surface and does not change where the rollers are when the board enters and leaves. If you are working out which machines belong in a small shop in the first place, our guide to essential tools for small spaces and the overview of woodworking machinery both cover where a benchtop planer earns its footprint. Planing also throws the fine dust that matters most, so read respirators for woodworking before you spend an afternoon milling a stack of boards.

Planer Snipe FAQ

Is snipe normal on a benchtop planer?

On most of them, yes. The head assembly on a small planer rides on columns with a few thousandths of clearance, and that clearance is what the snipe is. It can be reduced to nothing with technique, and it is not a defect you can return the machine over.

How deep is planer snipe?

Shallow. One published measurement on a small Delta planer came in at 0.008 inch over the first and last two inches. Yours may differ, and measuring it is the first useful thing you can do.

Why do I get snipe on one end only?

That usually points at support rather than the head. Head movement tends to be symmetrical, because the same roller imbalance happens at entry and at exit. Snipe at one end alone suggests the board is being held differently going in than coming out, so look at your infeed and outfeed setup first.

Does running boards end to end stop snipe?

It addresses the head movement cause directly, because the rollers never lose contact and the head is never loaded on one side. It does nothing for a long board tipping on an unsupported end, which is why the diagnosis above matters.

Should the infeed table be level with the bed or above it?

Slightly above, on the order of 1/16 inch at the outer end. Set level, a board can still rise as it enters. Set high, the wing holds the end down against the bed through the moment that matters.

Can I sand snipe out?

You can, and it takes longer than it sounds. A few thousandths across the full width of a board means sanding the whole face down to the bottom of the dip, or you trade a step for a hollow. Cutting the ends off is faster in almost every case.

Will sharper knives fix snipe?

No. Sharp knives fix tearout and surface quality. Snipe is a depth of cut change caused by the head or the board moving, and a fresh set of knives will reproduce it exactly.

Do drum sanders and jointers snipe too?

Drum sanders can, for the same roller and head reasons. A jointer does not snipe in this sense, because you reference the board against fixed infeed and outfeed tables rather than feeding it between rollers, and its equivalent failure is a dip or a taper from tables that are out of alignment.