How to Use a Smoothing Plane: Setup, Tips & Techniques
When it comes to versatile woodworking hand tools, the block plane usually gets most of the attention. But there's another plane that deserves a spot near the top of the list — the smoothing plane.
A smoothing plane can handle many of the same tasks as a block plane, along with a few that benefit from its larger size. It's useful for removing machine marks, trimming parts to fit, cleaning up edges, and putting a smooth final surface on a board.
And when a smoothing plane is properly sharpened and adjusted, the results can be impressive. A few passes can leave a surface that feels almost like glass, with little additional sanding required.
The key is understanding how to set up the plane and use it effectively.
What Is a Smoothing Plane?
A smoothing plane, sometimes called a smoother, is a relatively short bench plane designed to remove thin shavings and produce a smooth finished surface.
Most traditional smoothing planes are approximately 8" to 10" long, with a cutting iron around 2" wide.
A No. 4 bench plane is a common example.
The short sole makes a smoothing plane easy to maneuver and allows it to follow subtle variations in a board's surface. This makes it particularly well suited to final smoothing after the wood has been flattened with a jointer, planer, or longer hand plane.
A smoothing plane is useful for:
- Removing planer and jointer marks
- Smoothing hardwood panels and furniture parts
- Cleaning up board edges
- Trimming parts to their final dimensions
- Refining surfaces before applying a finish
- Working areas where power sanding may be less convenient
While a smoothing plane can perform some flattening and edge-jointing tasks, its main strength is producing a clean surface with very fine cuts.
How to Set Up a Smoothing Plane
A sharp blade is only part of the equation. The way the cutting iron, chipbreaker, and mouth are adjusted has a major effect on the quality of the cut.
You don't need to completely rebuild a hand plane to get good results. But a few setup details are worth checking.
Start with a Sharp Cutting Iron
A traditional metal smoothing plane typically holds its cutting iron at a 45° angle to the sole.
The blade itself is commonly sharpened with a bevel angle between 25° and 30°.
This combination works well for most general-purpose smoothing.
The important part is that the cutting edge is sharp and properly honed. A dull blade requires more force and is more likely to tear wood fibers rather than slice them cleanly.
Before adjusting anything else, make sure the iron is ready to cut.
Add a Slight Crown to the Blade
One of my favorite smoothing plane adjustments is to add a barely noticeable crown to the cutting edge.
Instead of sharpening the blade perfectly straight across, I create a very slight curve, with the center projecting just a little farther than the corners.
This offers two advantages.
First, it prevents the corners of the iron from digging into the wood and leaving visible tracks.
Second, it gives you more control over the width of the shaving.
When working difficult hardwood, you can take a narrow shaving using only the center portion of the iron. This reduces cutting resistance and makes the plane easier to push.
The crown should be extremely subtle. You want to prevent corner tracks without leaving noticeable scallops in the surface.
Adjust the Chipbreaker
The chipbreaker sits directly behind the cutting edge of the iron.
On a traditional bevel-down smoothing plane, it helps control the shaving and supports the cutting iron.
For fine smoothing, I like to position the leading edge of the chipbreaker approximately 1/32" behind the cutting edge.
Make sure the chipbreaker fits tightly against the iron so shavings can't become trapped between the two pieces.
The exact setting can be adjusted depending on the wood and the type of cut you're making.
Set a Narrow Mouth Opening
The opening in the sole where the blade projects is called the mouth.
For fine smoothing cuts, a relatively narrow mouth can help support the wood fibers immediately ahead of the blade.
This reduces the tendency of the fibers to lift and tear before they're cut.
On a traditional bench plane, the mouth opening can be adjusted by moving the frog.
Set it narrow enough to support the fibers while still allowing the thin shavings to pass through freely.
If the mouth is too tight, shavings can clog the plane.
WOODSMITH TIP: Take Thin Shavings. A smoothing plane works best when it removes very little material. Retract the blade and gradually advance it until the plane begins taking a fine, continuous shaving. For final smoothing, a thin shaving is generally better than an aggressive cut. It requires less effort and leaves a cleaner surface.
Secure the Workpiece Before Planing
Before using a smoothing plane, make sure the workpiece is held securely.
A plane requires steady forward pressure, so the board needs to remain stationary throughout the stroke.
For planing a board's face, bench dogs, a bench stop, or clamps can hold the workpiece against the bench.
For edge planing, a bench vise is often the most convenient option.
The goal is to support the board firmly without placing clamps or other obstructions in the path of the plane.
Once the workpiece is secure, you're ready to concentrate on the cut.
Read the Grain to Prevent Tearout
One of the most important smoothing plane techniques is learning to read the grain.
Wood fibers rarely run perfectly parallel to the face of a board. Instead, they often rise toward the surface at a slight angle.
If you plane against the grain, the cutting edge can lift the fibers and tear them away below the surface.
This leaves a rough, chipped appearance known as tearout.
The solution is to plane with the grain whenever possible.
Look at the edge of the board and identify the direction the fibers are running.
Position the workpiece so the plane travels in the direction that keeps the fibers supported as they're sliced away.
This is sometimes described as planing "uphill" with the grain.
If you begin to see tearout, try reversing the direction of the cut.
On boards with reversing or highly figured grain, you may need to adjust the blade, take lighter cuts, or change your planing direction as you work across the surface.
WOODSMITH TIP: Let the Shavings Tell You What's Happening. Pay attention to the shavings coming out of the plane. Thin, continuous shavings and a smooth surface usually indicate that the plane is cutting properly. If the plane starts tearing the wood or becomes difficult to push, check the grain direction, blade sharpness, and depth of cut before continuing.
Use the Right Stance and Planing Motion
Using a smoothing plane effectively involves more than pushing it across a board.
Your stance, balance, and the way you apply pressure all influence the cut.
A traditional metal smoothing plane typically weighs several pounds. That mass helps the tool remain steady and resist chatter.
But you still need to guide it correctly.
Keep Your Feet Balanced
Stand with one foot slightly ahead of the other, facing the direction of the cut.
This gives you a stable base and allows you to move your body forward as the plane travels along the board.
Rather than relying entirely on your arms, use your body weight to help drive the plane.
A smooth, controlled motion is easier to maintain and reduces fatigue.
Apply Steady Downward Pressure
Keep the sole of the plane firmly against the wood throughout the stroke.
At the beginning of a pass, emphasize pressure toward the front of the plane.
As the plane moves across the board, maintain balanced pressure. Near the end of the stroke, shift more pressure toward the rear.
This helps keep the plane stable as it enters and leaves the cut.
Maintain a Smooth, Controlled Stroke
You don't need to push a smoothing plane as fast as possible.
A steady stroke is more important than speed.
If you're experiencing tearout, slowing down can sometimes help you maintain better control of the cut.
Avoid forcing the plane through difficult grain. Instead, take a lighter shaving and make another pass.
How to Plane the Edge of a Board
Although a smoothing plane is primarily designed for surface work, it can also clean up the edges of boards.
The challenge is keeping the plane square to the narrow edge.
One technique I use is to wrap the fingers of my forward hand beneath the plane, where they can lightly reference the side of the workpiece.
This helps guide the plane and makes it easier to keep the sole balanced on the edge.
As you work, concentrate on maintaining even pressure and a consistent angle.
A few light passes are often all that's needed to remove saw marks or fine-tune an edge.
For long boards that need to be perfectly straight for edge-gluing, a longer jointer plane is generally the better choice. But a smoothing plane works well for shorter edges and localized cleanup.
Should You Skew a Smoothing Plane?
When pushing a hand plane, it's natural to angle the tool slightly rather than keeping it perfectly square to the direction of travel.
This is called skewing the plane.
Skewing changes the way the cutting edge engages the wood.
It creates a slicing action and reduces the effective cutting angle, which can make the plane easier to push.
This can be helpful when working some hardwoods or when the plane requires a little too much effort.
However, there's a tradeoff.
A lower effective cutting angle can make certain woods more prone to tearout, particularly when the grain is difficult or highly figured.
The best approach is to experiment.
If skewing the plane improves the cut, use it. If the surface begins tearing, try a straighter stroke, a lighter shaving, or a different planing direction.
The goal is always the same: a smooth surface with as little effort as possible.
Shop Tip: Wax the Sole for Easier Planing
One of the simplest ways to make a smoothing plane easier to use is to reduce friction between the sole and the wood.
A little beeswax can make a noticeable difference.
Rub a small amount of wax along the sole of the plane, then buff away any excess.
The wax helps the plane glide smoothly over the workpiece, reducing the force needed to push it.
This is especially helpful when working dense hardwoods or planing for extended periods.
Use only a light application, particularly if the wood will be stained or finished afterward.
Smoothing Plane vs. Sandpaper: Which Is Better?
A smoothing plane doesn't need to replace your power sanders to earn a place in the workshop.
Both tools have their strengths.
A sharp smoothing plane removes wood fibers with a cutting action rather than abrading the surface. This can leave an exceptionally clean surface, especially on straight-grained hardwoods.
It's also useful for quickly removing machine marks or leveling small areas without producing clouds of sanding dust.
Sandpaper, on the other hand, works well on irregular shapes, difficult grain, and surfaces that need a consistent abrasive preparation before finishing.
For many projects, I use both.
A smoothing plane handles the initial surface cleanup, followed by light sanding where necessary to prepare the wood for the chosen finish.
There's no need to make the process more complicated than it needs to be.
RELATED ARTICLE: Scraper Plane vs. Cabinet Scraper: Smoothing Wood Without Sanding
Get More from Your Smoothing Plane
A smoothing plane is one of those tools that becomes more useful the longer you work with it.
Once you understand how to sharpen the blade, adjust the mouth, read the grain, and control the stroke, you'll find opportunities to use it throughout the woodworking process.
From cleaning up machine marks to trimming edges and producing smooth furniture surfaces, a well-tuned smoother can handle a surprising variety of tasks.
And there's something satisfying about watching a thin, continuous shaving curl out of the plane and seeing the clean surface left behind.
A smoothing plane doesn't have to replace your power tools. It simply gives you another way to get the results you're after — often with greater control and less effort.
Get More from Your Hand Planes
A smoothing plane is great for surface preparation, but other hand planes are designed for precision joinery. Learn how rabbet planes, shoulder planes, and plow planes can help you cut grooves, trim tenons, and fine-tune woodworking joints.
EXPLORE SPECIALTY JOINERY PLANES → Discover Specialty Planes for Better Joinery
Master the Card Scraper
When difficult grain makes hand planing a challenge, a sharp card scraper can be the perfect alternative. Learn how to use this simple hand tool to remove machine marks, smooth figured wood, and prepare surfaces for finishing.
LEARN TO USE A CARD SCRAPER → Another Way to Get Smooth Wood Surfaces
