A cleaving axe or cleaver is a form of axe used within green woodworking to split wood lengthways. Cleaving (riving) is used to turn a log into lumber or billets (short or thick pieces of wood) into firewood. Splitting axe is sometimes described as an old name for a splitting maul [1] or froe.
A cleaving axe resembles a felling axe but is heavier, more wedge shaped, not sharp-edged and the poll is flat for driving wedges. [2] The edge is of medium length, almost straight with just a slight camber, and symmetrical top and bottom. A section through the edge is that of a simple splitting wedge. [3] The edge itself does not need to be sharp: cleaving relies more on wedge action than chopping (cutting) with an edge. The section of the axe should be triangular though, with flat sides, rather than the deeply hollow-sided forged and welded axes, or the modern convex-sided "apple pip" axe grind. [4] Nor should the edge be ground at a bevel. The work of using the axe, and its ability to split cleanly, depends on having flat sides with the minimum of friction, rather than all the force of the timber being concentrated on one protruding line. [3] The handle is straight and fairly short, around 18 in (460 mm), as the cleaving axe is only held, not swung. [3] As the axe head must penetrate fully into the wood, the poll [5] is minimal, narrower than the axe cheeks, and is never used for pounding other tools, lest it damage or mushroom the head. [6]
Cleaving is done by driving a wedge between the fibres of a log, so as to split fibres apart along their weakest path. [7] This work may appear strenuous, but is far less effort than rip sawing by hand. It is first done radially, to split the log into wedged segments. Timbers with medullary rays, such as oak, may be hard to split through these radial rays and so careful alignment is made to split between them. Segments are halved symmetrically at each step, as this encourages them to split more evenly than attempting to cleave off thin sheets repeatedly from one end. [8]
Cleaving usually begins from one end of a log, by driving the cleaving axe or a splitting wedge into the end of the log. [7] It is driven further by use of a mallet or froe club. As always, a hammer should be avoided when striking a hard steel tool, as it damages the tool by mushrooming it and may even cause cracking. A short log may be split entirely from one end, a long log will require an initial split to be extended along the log by the use of axe or wedges, driven in from the sides. [8] Short logs are cleaved vertically, long ones horizontally.
The ability to use several tools at once makes the use of an axe and wedges capable of cleaving far heavier logs than a froe. The froe must also be used gradually from one end, the axe (or wedges) may enter the log from the side. The froe does however have a wider blade, and so may give a more precisely flat surface when cleaving wide timber, such as for roofing shingles. It is common to start cleaving a log with an axe, finish the first heavy splits with wedges, then use a froe to make the finished items.
Splitting mauls are heavy axes (6 lbs or more) used for rough splitting of firewood. They have small heads in terms of edge length, but are heavy as they are especially wide across the cheeks and have a steep taper for rapid splitting. [9] To provide the power necessary, they have full-length shafts and are used with a full swing at the log. Splitting is usually done to logs that are already sawn to length and so they may be split vertically. To split longer logs, wedges are driven with the heavy poll of this maul, giving its alternative name of "hammer-poll axe". [9]
Splitting axes are inconsistently described. Some are cleaving axes, used for green woodworking. [6] Others are a crude firewood-splitting axe, but without the heavy poll of a maul. Light axes, unless specifically intended for it, should never be used for hammering with their poll.
An adze or adz is an ancient and versatile cutting tool similar to an axe but with the cutting edge perpendicular to the handle rather than parallel. Adzes have been used since the Stone Age. They are used for smoothing or carving wood in hand woodworking, and as a hoe for agriculture and horticulture. Two basic forms of an adze are the hand adze —a short-handled tool swung with one hand—and the foot adze (hoe)—a long-handled tool capable of powerful swings using both hands, the cutting edge usually striking at foot or shin level. A similar tool is called a mattock, which differs by having two blades, one perpendicular to the handle and one parallel.
A broadaxe is a large broad-headed axe. There are two categories of cutting edge on broadaxes, both are used for shaping logs into beams by hewing. On one type, one side is flat, and the other side beveled, a basilled edge, also called a side axe, single bevel, or chisle-edged axe. On the other type, both sides are beveled, sometimes called a double bevel axe, which produces a scalloped cut.
In woodworking, hewing is the process of converting a log from its rounded natural form into lumber (timber) with more or less flat surfaces using primarily an axe. It is an ancient method, and before the advent the sawmills, it was a standard way of squaring up wooden beams for timber framing. Today it is still used occasionally for that purpose by anyone who has logs, needs beams, and cannot or would prefer not to pay for finished lumber. Thus, homesteaders on frugal budgets, for example, may hew their own lumber rather than buy it.
A chisel is a wedged hand tool with a characteristically shaped cutting edge on the end of its blade, for carving or cutting a hard material. The tool can be used by hand, struck with a mallet, or applied with mechanical power. The handle and blade of some types of chisel are made of metal or wood with a sharp edge in it.
A splitting maul also known as a block buster, block splitter, chop and maul, sledge axe, go-devil or hamaxe is a heavy, long-handled axe used for splitting a piece of wood along its grain. One side of its head is like a sledgehammer, and the other side is like an axe.
Firewood is any wooden material that is gathered and used for fuel. Generally, firewood is not heavily processed and is in some sort of recognizable log or branch form, compared to other forms of wood fuel like pellets. Firewood can be seasoned and heat treated (dry) or unseasoned (fresh/wet). It is generally classified as either hardwood or softwood.
A mallet is a tool used for imparting force on another object, often made of rubber or sometimes wood, that is smaller than a maul or beetle, and usually has a relatively large head.
A sledgehammer is a tool with a large, flat, often metal head, attached to a long handle. The long handle combined with a heavy head allows the sledgehammer to gather momentum during a swing and apply a large force compared to hammers designed to drive nails. Along with the mallet, it shares the ability to distribute force over a wide area. This is in contrast to other types of hammers, which concentrate force in a relatively small area.
A froe, shake axe or paling knife is a tool for cleaving wood by splitting it along the grain. It is an L-shaped tool, used by hammering one edge of its blade into the end of a piece of wood in the direction of the grain, then twisting the blade in the wood by rotating the haft (handle).
A wedge is a triangular shaped tool, a portable inclined plane, and one of the six simple machines. It can be used to separate two objects or portions of an object, lift up an object, or hold an object in place. It functions by converting a force applied to its blunt end into forces perpendicular (normal) to its inclined surfaces. The mechanical advantage of a wedge is given by the ratio of the length of its slope to its width. Although a short wedge with a wide angle may do a job faster, it requires more force than a long wedge with a narrow angle.
Japanese carpentry was developed more than a millennium ago that is known for its ability to create everything from temples to houses to tea houses to furniture by wood with the use of few nails.
Wood shingles are thin, tapered pieces of wood primarily used to cover roofs and walls of buildings to protect them from the weather. Historically shingles, also known as shakes, were split from straight grained, knot free bolts of wood. Today shingles are mostly made by being cut which distinguishes them from shakes, which are made by being split out of a bolt.
This glossary of woodworking lists a number of specialized terms and concepts used in woodworking, carpentry, and related disciplines.
An axe is an implement that has been used for millennia to shape, split, and cut wood, to harvest timber, as a weapon, and as a ceremonial or heraldic symbol. The axe has many forms and specialised uses but generally consists of an axe head with a handle, also called a haft or a helve.
A log splitter is a piece of machinery or equipment used for splitting firewood from softwood or hardwood logs that have been pre-cut into sections (rounds), usually by chainsaw or on a saw bench. Many log splitters consist of a hydraulic pump or electric motor which then powers a hydraulic or electrical rod and piston assembly. Generally, these are often rated by the tons of force they can generate. The higher the force rating, the greater the thickness or length of the rounds that can be split. The log splitter consists of all four major hydraulic components.
A twybil is a hand tool used for green woodworking. It is used for chopping out mortises when timber framing, or making smaller pieces such as gates. It combines chopping and levering functions in a single tool.
Bush carpentry is an expression used in Australia and New Zealand that refers to improvised methods of building or repair, using available materials and an ad hoc design, usually in a pioneering or rural context.
Hacking or side knives may be considered as either light hatchets or heavyweight knives.
Wood splitting is an ancient technique used in carpentry to make lumber for making wooden objects, some basket weaving, and to make firewood. Unlike wood sawing, the wood is split along the grain using tools such as a hammer and wedges, splitting maul, cleaving axe, side knife, or froe.
