Fine Woodworking Project Guides

Handplanes

How-To

Handplaning With Precision

You can use a smoothing plane for more than just smoothing.

By Bob Van Dyke #287-Jan/Feb 2021 Issue

Synopsis: A handplane is useful for much more than smoothing. In fact, Bob Van Dyke uses his No. 4 to create perfect edge joints on panel glue-ups, fix an uneven reveal around a door frame, correct gaps in mortise-and-tenon joinery, adjust miter joints, and flatten cupped, bowed, or twisted boards.

It was not until I started working with Will Neptune years ago that I began to appreciate the value of a systematic approach to working with a handplane. Until then, I had used one for smoothing and making pretty shavings, and completely missed the level of precision possible. By approaching planing tasks, including joinery, systematically, I’ve been able to work more accurately using just a single plane, my No. 4, whose small size lets me target specific areas effectively.

The key is to plan and count your strokes. Most plane shavings are around 1–3 thousandths of an inch thick—the average piece of paper is 3 thousandths of an inch thick—making the handplane an incredibly precise tool for adjustment. By mapping out and counting the strokes, you can predict and control your results. This means precision doesn’t come from taking a heavier or lighter cut, but by keeping track of how many passes you have made—and where you’ve made them.

**Fold the boards for a flat glue-up.** After figuring out their orientation in the final panel, close the boards like a book with the glue joint at the spine. This way, when you plane their edges, you’ll guarantee the edges meet at supplementary angles even if they aren’t exactly 90°. Clamp them near the joint before planing.

fold boards together and plane both edges — By folding the boards together and planing both edges at once, you’ll end up with a flat panel even if the angle of the edges is out of square.

Add a slight hollow along the joint with handplaning — **Add a slight hollow along the joint.** Start in the middle and work your way out with progressively longer, overlapping strokes. Take as many passes as you need, with the second to last shaving starting and stopping about 1⁄4 in. from the ends.

Better edge joints

One of the most useful and rewarding tasks with a handplane is creating spring joints. This traditional technique is used to edge-glue two boards together, and it allows you to easily align boards that are at their final thickness. Thus, the technique is extremely useful when gluing up tabletops or panels that will be wider than the capacity of your thickness planer. The idea of the spring joint is to create a small hollow in the middle of the joint that gradually tapers to nothing at the ends. This is done with overlapping cuts, beginning in the middle and working outward. I find the technique easiest on boards shorter than 4 ft.

Video: Creating a spring joint with a handplane
Bob Van Dyke demonstrates how he creates a spring joint

Orient the boards as they’ll go together in the final panel and close them like a book. Clamp them together near the edges you’ll glue. Plane both boards along their full length until they are flush. Then visually divide the edges into four or five sections.

Begin with one full-width shaving over the middle section. Now take a full-width shaving across the second section as well as the first. Repeat along the length of the board. The short sole on the No. 4 allows the plane to follow the diving cut as you form the hollow. The last pass should be twin continuous shavings the length of both boards.

continuous handplaning side to side and end to end — **Final pass is full-length.** A continuous shaving side to side and end to end ensures a quality surface for the strongest joint.

check for flatness with a straight edge — **End with a flat panel.** Stack the boards and check for flatness with a straightedge. Because of the spring joint, the boards should touch at the ends with a very small gap at the center.

clamp wood — When clamped here, the joint will close and pressure will transfer to the ends. As you begin to tighten the clamp, push any bow into alignment if the boards aren’t flush along the joint.

Planing technique is critical here. To begin the stroke, apply extra downward pressure over the plane’s front knob and only a little over the tote. Transition the pressure to the tote and release it off the knob as you reach the end of the stroke.

Test the joint by setting one board in a vise, planed edge up. Place the second board, planed edge down, on top of the first. You should be able to fit a dollar bill between the two at the center, but not much more. When you clamp across the middle, the pressure on the ends increases dramatically while the center of the joint closes.

If the joint’s not flush along its length, you get to use the most important benefit of this technique. Because the boards’ ends are tight while the center is not completely closed as you begin clamping, you can push the center of one board perfectly flush with the mating board while tightening the clamp. Properly glued up, the boards will be aligned well enough that any discrepancy is easy to remove with a final handplaning or card scraping when the joint is dry, eliminating the need for further thickness planing.

Joinery: Sneak up on a perfect fit

When it comes to furniture, precise fit is important. If an inset door looks out of square in its opening or a tenon shoulder does not close up, it can be easily fixed by counting strokes and taking successively longer or wider cuts.

Fitting a door— Frequently, a furniture part like a door or draw-er front needs to be tapered to fit in its opening. Both are handled the same way. After jointing one edge, I’ll hold it in the opening tight against the carcase to determine how much the bottom and top of the workpiece need to be trimmed to make it square to the opening. These cuts are usually done on the tablesaw with a sled and a shim to match the angle needed. After dialing in the top and bottom, you usually have to correct the other edge using tapering cuts.

First determine which end needs the most material removed to create an even gap. Then, to map out your cuts, visually divide the workpiece into several sections of equal length. For reference, I’d break a 24-in.-long door into five sections.

Starting at the “widest” part of the workpiece, take a shaving the length of the first section. Then take a shaving over the first and second sections. The next shaving will include the third section. Continue until you have taken a continuous shaving over all five sections, or the entire length of the stile. The first section will have had five sets of thin shavings, while the last section will only have had one. But because you end with a full-length shaving, the edge stays straight. Need more of a taper? Do another set of shavings.

Fit a door

When installing a door, it’s common to find uneven gaps around the edges. A tapered cut along an edge can fix the problem quickly.

**Put the door in place to check for uneven gaps.** After jointing one edge and using the tablesaw to trim the door to fit top and bottom, place the door in its opening and note where the other edge needs trimming.

handplaning from the “wide” end — **Work from the “wide” end.** Starting at the end of the edge that needs trimming, take one short shaving. Then take a longer one, beginning from the same point. Continue the overlapping cuts until you’ve planed along the whole stile. By ending with a full-length shaving, you ensure the edge of the stile remains straight. If the door still needs more taper, repeat the process.

Squaring a leg— For seamless joinery, parts need to meet perfectly. This usually means parts coming together at 90°. Take a table, for example. If the square shoulder of an apron seats on an out-of-square leg, you’ll see a gap. Squaring a table leg uses the same high-to-low tapering technique as the door, but across the workpiece’s width rather than along its length.

Divide the leg’s width into four or five sections. Start by taking one narrow shaving off the highest section. The second shaving should be wider, comprising the first section and the second. Continue until you take a final full-width shaving that includes the last section. If the leg is still out of square, take a second series of cuts.

Fine-tune joinery

Overlapping shavings can work to close up gaps in joinery.

long grain tenon area around mortise — **This shoulder won’t close.** If the square shoulder of a tenon seats on an out-of-square leg, you’ll see a gap. Rather than adjust the end-grain shoulder, you can easily fix the long-grain area around the mortise.

first narrow shaving from handplaning — **Start at the high corner and work across.** The first shaving should be narrow.

handplaning advance across the face — From there, advance across the face until you end with a shaving the width of the leg. These overlapping shavings progressively lower the high side while blending it into the low side, thereby closing the gap.

Adjusting a miter— There are a couple of reasons to plane a miter. For one, a hand-planed miter will always close tighter than one off the saw. Plus, a mitered furniture part frequently needs to be adjusted to match another furniture part, like a molded plinth base and its case above. These bases are typically just a little larger than the carcase, and it is critical that the reveal between them is even. To accomplish this, adjust the miters.

Start by planing the miters on the front piece, and then leave them alone. You’ll fit the side pieces, which is why I always leave these long. First, determine if the inside or the outside corner of the miter needs to be trimmed to fix the reveal.

Adjust these miters by taking three or four gradually longer overlapping cuts that start at the corner that requires the most material to be removed. End with a full shaving.

Take light cuts and check your progress frequently.

Adjust a miter

Use overlapping plane strokes to dial in the angle of a miter joint.

short handplaning cuts to lengthen the plane — **Begin with short cuts that lengthen as you plane across the joint.** Be careful. It’s surprising how much a set of light overlapping cuts on a miter will affect the fit.

three overlapping cuts by handplaning — Three overlapping cuts totaling a few thousandths of an inch can move the back end of a 20-in. side as much as 1⁄8 in.

Flattening: Do it all with one plane

When flattening a board by hand, the typical techniques use at least two or three different planes to get the job done. With this method, you can fix bow, cup, and twist all with a No. 4. Again, you’ll plan your strokes while using the plane’s short sole to your advantage by targeting specific areas. If you think of the surface of the board as a series of mountains and plains, this method of overlapping cuts lowers the mountains to the level of the plains.

Your goal is to create a fully flat reference face, whether on a roughsawn board or a previously milled board that moved afterward, before planing the opposite face parallel by machine or by hand. The importance of these techniques is that you are not limited by the width of your electric jointer and you have to remove only enough wood to correct the problem.

In all these flattening techniques, the major planing is all done across the grain. A sharp plane can easily take cross-grain shavings three times as heavy as it can with the grain. The final surfacing can be done with light smoothing cuts along the grain or with a card scraper and fine sandpaper.

Cup— My method for tackling cup works by making overlapping cuts beginning with the high spots (the edges) until they meet the low spot (the center).

Start with a series of cross-grain shavings 11⁄2 in. to 2 in. long, planing from the front edge toward the middle of the panel. Work your way from one end of the board to the other. Start a second series of shavings over the first series, but make this set a little longer. Continue until your shavings reach the middle of the panel.

Repeat the process on the far edge with the first set of shavings starting about 11⁄2 in. from the edge. Work along the whole length of the board. With each set of cuts, take progressively longer shavings until you are near the center of the board.

Now plane all the way across the board while moving down its full length. Gauge your progress with a straightedge.

Flatten a cup

For boards too wide for a jointer, you can flatten a face with a handplane by paying attention to your passes.

cup up — **Cup up, wedges down.** Van Dyke needs to stabilize the board before he planes it, so he uses wedges and his tail vise.

handplaning the board — **Work toward the middle from the high edges until the face is flat.** When lowering each edge, start with short, cross-grain strokes and work down the board’s length. Increase the length of the strokes for each trip down the board. Your final set of shavings will be across the board’s whole width.

use a straightedge to track handplaning progress — Track your progress with a straightedge.

Bow— Hold the board on the bench with the bow up and place wedges underneath to stabilize it. Divide the length of the board into as many sections as seems reasonable. The more bowed the board, the more sections you’ll need.

Starting at the ends and working in toward the middle, take full strokes across the grain over the first section. Next, plane both sections one and two. Continue working in from both ends until you reach the center. The last set of shavings should march across the whole length of the board.

If there’s still bow, measure it and assess how many sections you should divide the board into this time around.

Fix a bow

With the concave side facing up, add wedges and plane across the grain starting at the ends and working toward the center.

immobilize the board before fixing the bow — **Immobilize the board.** After securing it with his tail vise, Van Dyke places wedges under the high spots. He’ll be planing cross grain, which generates a lot of force, and he doesn’t want the board to shift.

handplaning across the grain over first sections — **Take overlapping shavings and work from each end toward the middle.** Start by taking one full stroke across the grain over the first section at each end. Next take a stroke across sections one and two at each end. Continue working in from both ends until you reach the center. The last set of shavings should march across the whole length of the board.

straightedge to check if flat from handplaning — **Check for flat.** If the board is still bowed, you may have to repeat the steps. The remaining bow will determine how many sections you should divide the board into this time around.

Twist— Correcting twist works the same way, lowering the high corners to the valley in the middle by shaving down overlapping sections. For this example, let’s assume that each half of the board has five sections. A larger or more twisted board might have more.

Working across the grain only, plane the first section. The next set of shavings will be longer and will overlap the first section. Continue planing, working along the sections until you reach the far edge of the board. That last set of shavings will go all the way across the width of the board. Repeat on the other half. Check your progress with winding sticks to see if you’ll need to repeat the process.

Remove a twist

To flatten the face of a twisted board, first determine which are the high corners. Start there and plane progressively larger sections until the face is flat.

assess twist with winding sticks — **Assess the twist with winding sticks.** By sighting down the board with winding sticks, Van Dyke checks how much the board is twisted, and how many sections he’ll have to divide it into for planing.

draw the grid before handplaning — **Take the time to draw the grid.** Because the sections for twist are more complex than those for bow or cup, Van Dyke draws them on the board. Roughly divide the board in half in its width and length and then subdivide each half into equal sections.

handplaning from high corners inward — **Plane from high corners inward.** After wedging and clamping the board, take overlapping cross-grain shavings to flatten the opposing high corners. Regularly check your progress with winding sticks. If you need to do subsequent sets of shavings, you will probably divide the board into fewer sections to avoid taking off too much material.

From Fine Woodworking #287

To view the entire article, please click the View PDF button below.

	Video: Creating a spring joint with a handplane Bob Van Dyke demonstrates how he creates a spring joint, making it easier to glue up a flush panel or tabletop that requires only light handplaning or scraping.
	Foolproof Surface Prep Working systematically, Bob Van Dyke demonstrates how to remove mill marks and tearout with a scraper, break sharp edges and corners with a block plane, and sand to an even finish with sandpaper.
	The Basics of Milling Lumber Key machines and smart strategy for making boards foursquare

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