Can a jointer replace a planer?

No they serve different functions. A jointer flattens one face and squares one edge creating reference surfaces. A planer makes the opposite face parallel to the jointed face creating uniform thickness. You need both for perfectly square lumber. The jointer creates flat and the planer creates parallel and uniform. Should I buy a 6 or 8-inch jointer?

What size jointer is best for woodworking?

A 6-inch jointer at $300-700 handles boards up to 6 inches wide which covers most furniture parts and small projects. An 8-inch jointer at $800-2000 covers the vast majority of furniture lumber widths. Most hobbyists find 6 inches adequate. Serious furniture makers often wish they had bought 8 inches from the start. Boards wider than your jointer can be flattened with a hand plane or router sled. Why does bed length matter on a jointer?

How long should jointer tables be?

Longer beds produce flatter boards because they support the workpiece better preventing it from rocking over the cutterhead and following its existing curve. Short beds of 36-48 inches struggle with boards longer than 3 feet. For flattening 4-foot and longer boards a total bed length of 60 inches or more is ideal. This is the main advantage of floor-standing jointers over benchtop models. What is a helical cutterhead on a jointer?

Is a spiral cutterhead worth it for a jointer?

A helical cutterhead with carbide inserts is especially valuable on a jointer because jointers take deep aggressive cuts on rough lumber where tearout is more likely. Benefits include 50-75 percent less noise superior finish on figured grain individually replaceable inserts and much longer edge life. The upgrade is worth the extra $200-400 for anyone jointing regularly.

Article

Woodworking & Lumber

Wood Jointer Buying Guide: Bed Length, Cutterhead Types & Jointing Techniques Explained

Lumberama Editorial Team, Power Tool & Woodworking Experts Nov 18, 2024 13 min read

What a Jointer Does

A jointer creates two critical reference surfaces on rough lumber: a flat face and a square edge. These two surfaces are the foundation of every woodworking project — without them, nothing fits together properly. The jointer works by passing the board over a rotating cutterhead set into a flat table. The infeed table is set slightly lower than the outfeed table (the difference is the depth of cut). As the board passes over the cutterhead, it removes material from the high spots, progressively flattening the board with each pass.

6-Inch vs 8-Inch

The cutter width determines the widest board you can flatten in a single pass. A 6-inch jointer handles boards up to 6 inches wide — sufficient for most furniture and small project work. Price: $300-
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An 8-inch jointer handles boards up to 8 inches wide, covering the vast majority of furniture lumber widths. Price: $800-2,
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For boards wider than your jointer, you can joint one face with a hand plane or router sled, then use the planer for the second face. Most hobbyists start with a 6-inch jointer and find it adequate. Serious furniture makers often wish they had bought an 8-inch from the start.

Bed Length Matters

The length of the jointer tables (infeed + outfeed) directly affects how flat your boards come out. Short beds (36-48 inches total) can flatten short boards but struggle with longer stock — the board rocks across the cutterhead, following its existing curve instead of removing it. Longer beds (60-76 inches total) support the board better, producing flatter results. For flattening boards 4 feet and longer, a total bed length of 60 inches or more is ideal. This is why floor-standing jointers (which have longer beds) produce better results than benchtop models (which have short 28-36 inch beds) even if the cutter width is the same.

Cutterhead Types

The same two types available on planers apply to jointers. Straight-knife cutterheads use two or three long blades. They work well, are less expensive, and blades are easy to set and replace. Helical cutterheads with carbide inserts are quieter, produce better finish on difficult grain, and each insert lasts much longer. The helical upgrade is even more valuable on a jointer than a planer because the jointer often takes deeper, more aggressive cuts on rough lumber where tearout is more likely.

Fence Setup

The fence must be perfectly 90 degrees to the table for edge jointing square edges. Check with a reliable engineer's square and adjust as needed. Most jointers have adjustable fence stops at 90 and 45 degrees. The fence should be tall enough (3-4 inches minimum) to support boards standing on edge, and long enough (at least 24 inches) to guide the workpiece through the cut. A fence that tilts inward to 45 degrees allows beveled edges and chamfers.

Jointing Techniques

Face jointing (flattening a board face): set the depth of cut to 1/32 to 1/16 inch. Press the board firmly onto the infeed table with downward pressure on the leading end. As the board passes the cutterhead, transfer pressure to the outfeed table. Take multiple passes until the entire face shows freshly cut wood with no low spots. For twisted boards, identify the high corners (the board will rock on two diagonally opposite corners) and focus pressure on those high spots during the first few passes. Edge jointing (straightening and squaring an edge): press the flattened face firmly against the fence and the edge down on the table. Feed with steady pressure. The result is an edge that is straight, flat, and 90 degrees to the face — the reference edge for ripping on the table saw.

Top Models

Budget: WEN 6560T ($350, 6-inch benchtop with helical cutterhead), Grizzly G0945 ($400, 6-inch benchtop). Mid-range: Jet JJ-6CSDX ($700, 6-inch with enclosed stand), Grizzly G0654 ($700, 6-inch long-bed). Premium: Jet JJ-8HH ($1,500, 8-inch with helical cutterhead), Grizzly G0490X ($1,200, 8-inch with spiral cutterhead), Powermatic 60HH ($1,800, 8-inch helical).