An 8-inch jointer suits shops that regularly flatten boards wider than 6 inches, while a 6-inch unit covers most narrower stock at lower cost.
Most home shops outgrow a 6-inch jointer the first time a glue-up needs a board wider than the cutterhead allows. Boards get flattened in two passes, the seam shows, and the machine becomes the bottleneck. Whether an 8-inch jointer earns its price and footprint comes down to three things: the widths you actually mill, the space you can give it, and the power your shop can supply.
What Decides Whether You Need 8 Inches
An 8-inch jointer is the practical upgrade when your stock regularly runs past 6 inches wide; below that, a 6-inch machine usually does the same job for less money and floor space.
Woodworker’s Journal’s buying guidance notes that 8-inch models are generally more expensive and heavier than 6-inch jointers, but they’re often preferred because they carry longer beds that support longer boards through the cut. Bed length matters as much as the width rating — a short bed lets a long board rock, and no cutterhead fixes a board that dips at the ends. For most shops working in the 4- to 6-inch range, an 8-inch jointer isn’t about board width at all; it’s about the longer table and steadier feed that come with the bigger frame.
Three questions settle it:
- How wide is your widest routine board? If face-jointing 7- or 8-inch stock happens weekly, 8 inches pays for itself.
- How long is your longest board? Beds matter more than width for long stock.
- What does your shop supply? Several 8-inch models need 230V and a 20A circuit, which many garages don’t have.
Benchtop vs. Stationary: The Weight and Power Gap
8-inch jointers split into two classes — portable benchtop machines around 49 to 59 pounds that plug into 120V, and stationary cast-iron units weighing several hundred pounds that want 230V service.
A benchtop model like the Grizzly G0947 runs on a 120V, 10-amp motor with a spiral-type cutterhead, an 8-1/4 by 34-inch table, a 1/8-inch maximum depth of cut, and a 10-inch minimum workpiece length. The RIKON 20-800HSP is similar: a 6-row helical-style cutterhead with 16 carbide insert cutters, a 4-inch dust port, and 49 pounds assembled. Both fit on a bench and roll away when the shop shares space with a car.
Stationary machines play a different game. Powermatic’s 60HH runs a 2 HP, 230V motor with a 73 by 8-1/2-inch table and weighs 490 pounds net. If you’re considering this class, our breakdown of tested 8 inch jointer models compares bed lengths, cutterheads, and power needs side by side.
A middle path exists too. The Jet JJP-8BT jointer/planer combo runs on 115V at 13 amps, offers an 8-inch maximum cutting width, and covers both flattening and thicknessing in one 58.4-pound machine.
Common Mistakes When Sizing a Jointer
Buying on cutterhead width alone is the most expensive mistake — bed length, cutterhead type, dust collection, weight, and electrical service decide whether the machine actually works in your shop.
The setup costs surprise people more than the price tag does. At least one Powermatic 8-inch model specifies a 4-inch dust port and a 450 CFM minimum dust-collection requirement, so a shop running a shop vac needs a real collector. Manuals are the right source for setup and operation details; both the Purdue-hosted 8-inch jointer operating manual and Oliver Machinery’s 8-inch jointer owner’s manual exist for exactly that reason, and the Purdue manual warns to keep stock shorter than 3 inches away from the cutterhead.
New machines aren’t the only route. Used 8-inch jointers surface regularly as shops close or upgrade — inspect beds for flatness, check the cutterhead for nicks, and confirm the motor’s voltage before you commit.
Which Size Fits Your Shop
Match the machine to your stock, your space, and your panel — in that order.
Stick with 6 inches if your work stays under 6 inches wide and you’d rather keep the money and floor space. Move to a benchtop 8-inch if you want the longer bed without rewiring the garage. Step up to stationary 8-inch power if you face-joint wide or long stock regularly, own a real dust collector, and can run 230V.
FAQs
Can I joint a board wider than 8 inches?
Not in one pass. Instead, joint the board in two halves along the grain, keep the reference face flat against the bed, and clean up the seam. The seam is the weak point, so plan for it when gluing up panels.
Do benchtop 8-inch jointers handle hardwood?
Yes, with patience. Benchtop models typically run 120V motors and shallower depth-of-cut settings, so hardwood takes lighter passes at a steadier feed rate. Take thinner cuts, let the motor recover between passes, and don’t force longer boards past what the short bed can support.
Will an 8-inch jointer fit in a one-car garage?
Benchtop models at 49 to 59 pounds will, especially on a mobile base. Stationary units at nearly 500 pounds need a dedicated footprint and clearance on both infeed and outfeed sides — measure your longest board plus a few feet of walkway each way.
References & Sources
- Woodworker’s Journal. “What Size Jointer Should You Buy?” Supports comparing 6-inch vs 8-inch jointers on size, cost, and typical price ranges.
- Purdue University. “Operating Instructions and Parts Manual – 8-inch Jointer.” Confirms what an 8-inch jointer manual covers and the 3-inch minimum stock warning.
- Oliver Machinery. “8-Inch Jointer Owner’s Manual.” Confirms manufacturer manuals as the source for setup and safe operation.
