SOLID CARBIDE RAISED LAND MORTISE AND TENON BIT
Ultra-Shear's new solid carbide Raised Land Mortising Bits borrow most of their design from European mortising bits popular in the '70s and '80s. Two features distinguish these bits from other solid carbide straight bits…they're made with a cylindrical margin and a very slow helix.
The land clearance is ground into the carbide blank with a skinny strip of the original tool blank's curve left intact. That curved margin rides on the wall, maintaining dimensional accuracy and minimizing chatter.
The second difference is the slow helix. While the leading edge on a typical spiral bit wraps around the core somewhere between one-half and one-full revolution (depending on cut length), on these bits the edge goes only about one-fourth of the way around on the longest cut length. What does that mean? It means less carbide has been ground away so the bit is more rigid and less likely to vibrate.
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Without getting too deep in the weeds, the "land" of a router bit is the thick part that isn't the flute. The "margin" is the leading edge of the land…the part that does the cutting. On a traditional spiral bit, the cutting edge is the only part that touches the sidewall of the cut. The edge is formed by grinding away part of the land to create primary and secondary bevels, leaving only the exact cutting edge at the stated diameter of the tool. On our Raised Land bits, the land clearance is ground into the carbide blank with a skinny strip of the original tool blank's curve left intact. That curved margin rides on the wall, maintaining dimensional accuracy and minimizing chatter.
I can hear a bunch of you right now saying, "Part of the bit is rubbing on the wall of the cut? Isn't that going to burn?" You would think so. That's why we torture tested these bits over and over. For reasons we have yet to completely understand, they don't.
The European mortising bit we tested while developing these bits had sort of a drill bit shape ground into the tip. We skipped that and gave the end a square shoulder, making these bits ideal for cutting tenons, as well as mortises. We make them in 3 diameters, with multiple cut length options in each diameter. The 1/2" diameter comes in cut lengths of 1", 1-1/4", 1-3/4" and 2-1/4". The 1/4" and 3/8" diameters have cut lengths of 7/8", 1-1/8" and 1-3/8". You'll need a 3/8" collet for your router or a 3/8" x 1/2" collet adapter (available individually and included in the 3/8" set) to use the 3/8" bits.
Don’t settle for inferior quality imported bits. Ultra-Shear uses state-of-the-art CNC grinding equipment, the highest quality carbide, ultra-fine grinding wheels and skilled Northeast Ohio machinists to produce American-made router bits at extremely competitive prices. The days of paying extra for middleman markups are over. Buy direct from the manufacturer and pocket the savings. We’re confident you won’t find American-made Raised Land Mortising Bits of the same design for less. If you're using a Multi-Router, PantoRouter, hand-held router or router table to machine mortise and tenon joints, there's no better choice.
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WARNING: Wood Dust created by Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection.