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Sherwood Replacement Knives for Helical Cutter Heads Pack of 10 Tungsten Carbide Blades
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Sherwood Set of Three Blades for SWJ-150-D 6in Jointer Straight Cutterhead
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Sherwood Set of 4 Blades for SWJ-200-WB 8in Jointer Straight Cutterhead
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Achieve Flat, True Timber Surfaces with Quality Jointer Blades
Jointer blades are critical to producing smooth, flat surfaces when preparing rough-sawn timber for further processing. Whether you're edge-jointing for panel glue-ups or flattening a board face before thicknessing, sharp and properly aligned blades ensure clean, accurate results. The right set of blades minimises tear-out, reduces the risk of sniping, and helps prevent damage to expensive timber.
Most jointer blades are made from high-speed steel (HSS) or tungsten carbide, each offering distinct advantages. HSS blades are easier to sharpen and ideal for general-purpose use, while carbide-tipped blades provide longer edge retention and are better suited for heavy-duty or abrasive timbers. Blades should always be matched to the specifications of your particular jointer model to ensure safe and accurate performance.
Regular maintenance, including proper installation and timely replacement, is essential for optimal jointer function. Dull or misaligned blades can leave ridges, scallops, or burn marks on the timber, leading to more sanding or wasted material. Investing in high-quality replacement blades not only improves cut quality but also prolongs the lifespan of your machine by reducing strain on the motor and cutterhead.
FAQs
How often should I replace jointer blades?
It depends on usage and material type. Heavy use or working with hardwoods and resinous timber will dull blades faster. Replace or resharpen when you notice tear-out, ridges, or a drop in cut quality.
What’s the difference between HSS and carbide jointer blades?
High-speed steel (HSS) blades are easier to sharpen and suitable for most timbers. Carbide blades stay sharp much longer and are ideal for dense or abrasive woods but require professional sharpening when dull.
Can I sharpen jointer blades myself?
HSS blades can often be sharpened at home using honing guides or jigs, but precise sharpening requires skill. Carbide blades typically need to be sharpened professionally due to their hardness and fragility.
How do I know which blades fit my jointer?
Check your jointer’s manual or specifications for blade length, width, thickness, and hole configuration. Blade listings usually include compatibility details for popular jointer models and brands.
Do jointer blades need to be aligned perfectly?
Yes, blade height and alignment are critical to prevent uneven cutting, snipe, or chatter. Use a blade-setting jig or dial indicator to set the knives level with the cutterhead and outfeed table.
Are all jointer blades reversible?
No, not all blades are reversible. Many straight knives are single-edged and must be sharpened or replaced when dull. Some double-edged inserts in helical cutterheads are reversible and can be rotated when worn.
Can I upgrade to carbide blades if my jointer came with HSS?
In many cases, yes—provided the carbide blades match the same dimensions and mounting holes. Always check compatibility with your machine before switching materials.
How many blades does a typical jointer use?
Most jointers use two or three straight blades in the cutterhead. Some modern models use a helical cutterhead with multiple small inserts. Check your machine's specs to confirm the correct number and type.