Used 6-Inch Jointer vs. Planer Sled: What Each Actually Costs

Yo, let me tell you a story.

A guy in my building—third floor, same as me—texts me a Craigslist link. He wants to know if it's a deal. I told him I'd answer him after he measured his hallway, because that's the whole question with a jointer. Not the price. The hallway.

I run a second bedroom in Brooklyn that my landlord thinks is for guests. No dust collection worth the name, no truck, no room to swing a board. So when I see a jointer listing, the first thing I think isn't "flat stock." It's "where does that go, and who helps me carry 200 pounds of cast iron up two flights?"

That's the frame for this whole comparison. You already own a planer, or you're about to. The real question is what a used jointer buys you that a planer sled and a hand plane don't—after you count the knives, the fence, the floor space, and the time the thing charges you every single session.

First, What a Jointer Won't Do

A jointer flattens one face and squares one edge to it. That's it. It cannot thickness a board. Woodcraft's "Jointer Fundamentals" is blunt about it: run both faces over the jointer and "the result is almost certain to be a tapered board." The planer makes the second face parallel. The two machines depend on each other, which is why WOOD Magazine's Bob Hunter frames them as a pair.

So a used jointer is never a planer replacement. It's an addition. That matters when you're doing the math from a second bedroom in Brooklyn, because you're not buying the machine—you're buying the machine, the space it eats, and the setup time it demands.

And there's the real problem: a 6-inch bed can't face-joint anything wider than 6 inches. Fine Woodworking's Lary Shaffer says it plainly. A jointer gives you flat narrow stock and flat edges. The wide stuff still goes on a sled.

The Sled Route, Priced Honestly

Here's the planer-sled workflow in plain terms: a twisted board stays twisted through a planer, no matter how many passes. Popular Woodworking's Wayne Clevenger states it directly—"Running a twisted board through the planer doesn't make it flat." The sled is the fix. The board sits on a flat carrier, you wedge and clamp it so the high spots come off, and the planer makes the top parallel to the sled.

There are two published designs and they are not the same tool. Shaffer's Fine Woodworking sled is built around a 50-inch clamp-on straightedge—he says it's "available online for $35"—screwed to a 3/4-inch MDF base, with wedges slipped under the edges. Clevenger's Popular Woodworking sled is 12 inches wide and 6 feet long, MDF or a melamine shelf, with T-nuts and hardwood strips. A forum builder on Sawmill Creek spent "most of the day" building a six-foot one from the FWW plan.

I want to be straight with you: I can't put a dollar figure on a total sled build. The materials sheet—MDF, melamine, T-nuts, machine screws, a straightedge—isn't itemized in any source I trust here. The $35 clamp is the only hard number. So treat the sled as cheap-ish and mostly a time investment, not a quantified cost. That's the honest version.

Then hand-plane cleanup. A scrub plane for truing rough lumber runs $240 at Highland Woodworking for a Lie-Nielsen 40-1/2—1-1/2-inch blade, a 3-inch radius, 2.4 pounds, made for "removal of large amounts of waste wood." That's the tool for hogging off twist before or after the sled. The only hand-flattening time figure I found was a forum comment—"about an hour tops" with a decent jack or scrub plane and a jointer plane. It's an anecdote, not a measured study, and I won't sell it to you as one. But it tells you the shape of the work: it's per-board, by hand, with your back.

What the Used Jointer Actually Charges

Here's where the sticker price lies to you. A $400–$1,200 used budget is the conversation—but WOOD's 2009 ten-model test covered machines at $400–$600, and their 2022 test tagged a Top Tool at $1,500 and a Top Value at $700. New floor models today run higher still: Jet's JJ-6HHDX lists at $1,899 at Woodcraft, Jet's JJ-6CSDX surfaces a $1,399 financing example at Acme, and Powermatic's 54A is $2,199. So the used market is real. I just can't quote you a US street price—the one concrete used data point I have is a Delta 37-196C, 46-inch table, three knives, listed at CAD $1,200 by a Canadian dealer, and it sold. Use it for calibration, not as a price guide.

Now the running costs. Straight knives need sharpening or replacing, and WOOD describes resetting them as "fussy"—trial-and-error, both ends of the cutterhead, using the outfeed table as the reference and a block that should move about 1/8-inch without lifting. That's not a quick job.

Priced in: Arizona Carbide Tools quotes $10.25 per steel knife and $18 per carbide to sharpen, plus 50% for deep nicks. Do the arithmetic on a three-knife head—roughly $30.75 in steel or $54 in carbide per set, before shipping. Dispozablade's starter set for a three-knife 6-inch head is $239, with replacements at $28 per three-pack. Helical is the upgrade: 27 four-sided inserts on the Jet, WOOD citing $120–$350 for a full cutterhead set—but inserts get rotated, not routinely replaced, so don't budget it as a subscription.

Then the space. The Jet wants 350 CFM through a 4-inch port for dust. I have none of that in a second bedroom. Neither do you, probably.

The Inspection That Actually Matters

If you do go used, the fence is the thing. WOOD's test found every table within .0025-inch of flat, and fences running 29 to 35 inches long—the three worst about .006-inch out of flat, which they called no problem. A fence more than .010-inch out of flat needs machining to fix, if it can be fixed at all. That's your single best number walking into a seller's driveway. Check the fence. Then check the tables for coplanarity on the machines WOOD tested, because those had no built-in adjustment for it—out of alignment means shimming the outfeed table in its dovetail slide with thin metal until it's right.

Also: an outfeed table set lower than the knives gives you snipe—that scooped cut on the last inch or two of a board. WOOD defines it as a slightly deeper cut in the first and last 2–3 inches. Check for it, because you'll chase it forever if it's there.

So What Do You Actually Get for the Money?

Two things. First, speed of face-jointing narrow stock—the jointer's feed is set by you, by feel, and Woodcraft's guidance is 1/32-inch per pass for saw marks, up to 1/8-inch for heavy milling. No published board-feet-per-hour figure exists for either method—I checked—so I won't sell you a throughput comparison that isn't real. What I can tell you is the planer's feed rate is a hard number (14 feet per minute on a DeWalt DW735's slower setting, 26 on fast), and the jointer's is judgment, pass by pass. The sled workflow adds clamping and wedging time per board that nobody has quantified. That's the actual difference: the jointer restricts how straight your stock can be, not how fast it gets there.

Second, cut quality you'll notice. WOOD found straight-knife cutterheads "most often delivered perfectly flat, unblemished workpiece faces," while spiral carbide left striations needing about twice the cleanup—yet spiral won on bird's-eye maple, where the rest of the field tore out at least 1/32-inch deep. And the power note: spiral carbide needs more motor because two to three cutters are always in engagement. WOOD's verdict is the whole argument in one line: "a question of which matters most to you: cut quality or time."

My ruling: if you own a planer and build wide stuff, buy the sled first. The Wood Whisperer's been saying buy the planer first since 2007—that's not current testing, but it's the right shape of advice. Get flat narrow stock through a sled, clean edges with a circular saw and guide or a router table, and keep your money in the bank.

Buy the used jointer when you find yourself squaring the same 4-inch-wide boards over and over—frame stock, drawer sides, panel glue-ups—and only after you've confirmed your hallway, your fence, and your dust situation. Then measure the hall. Then measure it again.