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CT-7 Precision Low Angle Block Plane

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CT-7 Precision Low Angle Block Plane

This item is no longer in production and is not available for purchase. It is listed here for reference purposes only.

Item Number: 1101-140

Availability: Discontinued

Quick Overview

The CT-7 Precision Low Angle Block Plane was the 1999 Commemorative Tool.
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Product Description

Of all the various tasks performed in your woodshop, planing wood by hand is truly a festival of the soul and hands.Shearing wood with a razor edge and leaving a finish that is almost impossible to improve upon is one of those few moments where the maker, material, and tools unite in the communion of song we call craftsmanship. The well crafter plane, unlike any other woodworking tool, holds a special place in the heart of its owner--no other tool demands as much care, and yet no other hand tool is asked to do as much. The symbiotic relationship between the plane and its owner is unique, and when both are in "tune", oh, how mighty is the music of the plane!

There are many aspects to a handplane, and like a cherished violin, all must work in harmony for the tool to sing in your hand. The quality of the edge is paramount. The throat opening, blade to body rigidity, sole flatness and material, and blade adjustability all play fundamental roles in a well-deisgned plane. Each of these criteria relates to the other and when properly addressed, you have a "tool for the ages".

Any cutting edge is the intersection of two planes. In a plane iron these two surfaces are the back of the iron and the bevel. The ability of any edge to remain sharp is a result of five factors: the material to be cut, the metal alloy of the plane iron, the temper of the tool steel, the surface quality of the intersecting planes and the intelligence of te user. Four of these five criteria have been addressed with this plane iron.

The precision ground, A-2 tool steel plane iron of the CT-7 is unlike any you have used. This cryogenically tempered plane iron will keep a razor edge much longer than traditional tool steels. (Cryogenic tempering is a supplemental process to heat/quench tempering where tool steel is cooled below -300 degrees Farenheit in liquid nitrogen for several hours, which completely and thoroughly alters the molecular structure of the steel. The results are dramatic! The fine grain structure of the metal allows for extremely sharp edges that hold an edge much longer than traditional processes.) After the iron is tempered, we diamond lap the back. This creates a mirror-like surface you will never need to visit for sharpening! The primary bevel is ground to 25 degrees and a micro-bevel is the final touch, achieved with an 8000-grit water stone. This plane iron is ready right out of the box.

Secluded within the body of the CT-7 Precision Low Angle Block Plane is a stainless steel blade adjustment mechanism. A lead screw with 40 threads per inch (identical to a micrometer) mvoes the iron 0.025" per revolution of the adjustment knob. The blade protrusion, however, only increases 0.0052" per revolution because of the 12-degree pitch of the blade. With one-quarter turn of the adjustment knob, you advance the cutting edge 0.0013" which is one-third the thickness of a human hair! Finally, the blade adjustment shaft exits through a brass-bushing inset into a wooden infill. It is strikingly handsome!

Lateral cutting edge adjustments are achieved by manually canting the undersized blade either left or right. (It is important when honing to keep your fresh edge square to the sides. This is a precision tool and will not cut square if you are not reasonably close in your sharpening techniques.)

The sole of the CT-7 Precision Low Angle Block Plane is where we break from traditional manufacturing techniques. Beginning with a solid blank of stainless steel, the interior bosses of the tool are precisely milled with CNC milling machines. The throat is a gap in the sole of no more than 0.060" between the front and the iron edge--an extremely efficient clearance for shavings. (One of the many uses of a low angle block plane is for cutting end-grain. Unlike other planes where throat clearance affects the quality of the cut, it is less crucial in a low angle plane.) Finally, the sole is lapped prior to delivery.

The brass sides of the CT-7 are also precision milled and are joined to the sole with an interlocking double dovetail joint. many of you will wonder how we got this tool together--both exposed surfaces of the joint are dovetailed! After assembly, the sides are ground dquare to the sole, many of you will want to use this tool to "shoot" and edge.

The investment cast and highly polished silicon brass handle is a gorgeous study of motion and functionality. The radial knurls of the locking wheel create a visual feast and a functional mechanism for securing the blade to the body of the tool. The portion of the cap in contact with the blade is milled, insuring a light-tight seam that eliminates chatter and keeps the cutting edge rigid to withstand the forces of cutting.

From tip to toe, bottom to top, functionality was the driving criterion for this design. The front knob is smooth to touch and can be used as a finger rest of one-handed use or as a knob for two-handed applications. The curvature of the handle allows hands of all sizes to comfortably use this tool without compromises. The sides are free of intersecting protrusions allowing either to be a reference for side cutting applications. The rosewood or ebony infills are a final touch, creating what may be our finest tool to date.


The CT-7 Precision Low Angle Block plane has an overall length of 6 1/2", width is approximately 1 1/2" and the cutting edge is approximately 1 1/4". Overall, the height is just over 2". A 12'degree clock plane is the perfect tool for planing hardwoods and is the only plane that can effectively cut end grain.

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