Rip cut

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Rip cuts produce lumber of different cuts such as quarter sawn (A), flat or plain sawn (B), or rift sawn (other image). Plain quarter sawn.png
Rip cuts produce lumber of different cuts such as quarter sawn (A), flat or plain sawn (B), or rift sawn (other image).
The rift sawn rip cuts are perpendicular to the center of the log Riftsawn.svg
The rift sawn rip cuts are perpendicular to the center of the log

In woodworking, a rip-cut is a type of cut that severs or divides a piece of wood parallel to the grain. The other typical type of cut is a cross-cut, a cut perpendicular to the grain. Unlike cross-cutting, which shears the wood fibers, a rip saw works more like a series of chisels, lifting off small splinters of wood. The nature of the wood grain requires the shape of the saw teeth to be different, thus the need for both rip saws and crosscut saws; however, some circular saw blades are combination blades and can make both types of cuts. A rip cut is the fundamental type of cut made at a sawmill.

Contents

Definitions

Rip cut comes from rip: to split or saw timber in the direction of the grain, and cut: to divide with a sharp-edged instrument. [1] Wood may also be split along the grain (riven), but the split will follow the grain and usually not be flat. Knots also prevent riving thus the need for rip cuts. A kerf is the opening in the wood made by the saw.

Handsaws

Types of hand saws used to make rip cuts are rip saws, frame saws some of which are whipsaws, and veneer saws.

Power saws

Rip cuts are commonly made with a table saw, but other types of power saws can also be used, including a radial arm saw, band saw, and hand held circular saw. In sawmills the head saw is the first rip-saw a log goes through, which is sometimes a gang-saw, and then the cants may be resawn using other saws and then edged in an edger and sometimes cut to length by a crosscut saw. Also, smaller portable sawmills and chainsaw mills use rip-cuts to produce lumber. Each time a piece of wood is rip cut it takes time and the kerf material turns into sawdust and loses value so the number and width of each rip cut influence the economics of the operation: This gives band saws an advantage over circular saws and chainsaws.

Types of cuts

The types of rip-cuts influence the quality of the lumber. Plain-sawn is the most common type of cut where a log is repeatedly run through a saw and much of the lumber has wood grain nearly parallel to the width of the boards. Quarter sawn and rift-sawn wood is more time consuming and wasteful to produce but is of higher quality.

As a general rule, tools which work well for rip cutting do not work well for crosscutting. Most woodworkers thus have a table saw, which is used for rip cutting, and a separate chop or miter saw, which is used for crosscutting. Crosscut power-saws should never be used for ripping a board because it is very dangerous. Circular saw blades designed for rip cutting have a smaller number of larger teeth than similar blades designed for cross cutting. There are combination blades for table saws that can be used for ripping and cross cutting but should not be used for non through cuts such as dados and rabbets. If you use a radial arm saw to rip you need a blade with a negative hook angle for the teeth to keep the saw from lifting the board off the saw and kicking back.

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<span class="mw-page-title-main">Circular saw</span> Power tool

A circular saw or a buzz saw, is a power-saw using a toothed or abrasive disc or blade to cut different materials using a rotary motion spinning around an arbor. A hole saw and ring saw also use a rotary motion but are different from a circular saw. Circular saws may also be loosely used for the blade itself. Circular saws were invented in the late 18th century and were in common use in sawmills in the United States by the middle of the 19th century.

<span class="mw-page-title-main">Hand saw</span> Wood cutting tool

In woodworking and carpentry, hand saws, also known as "panel saws", are used to cut pieces of wood into different shapes. This is usually done in order to join the pieces together and carve a wooden object. They usually operate by having a series of sharp points of some substance that is harder than the wood being cut. The hand saw is a bit like a tenon saw, but with one flat, sharp edge.

A saw is a tool consisting of a tough blade, wire, or chain with a hard toothed edge used to cut through material. Various terms are used to describe toothed and abrasive saws.

Portable sawmills are sawmills small enough to be moved easily and set up in the field. They have existed for over 100 years but grew in popularity in the United States starting in the 1970s, when the 1973 oil crisis and the back-to-the-land movement had led to renewed interest in small woodlots and in self-sufficiency. Their popularity has grown exponentially since 1982, when the portable bandsaw mill was first commercialized.

<span class="mw-page-title-main">Table saw</span> Woodworking tool

A table saw is a woodworking tool, consisting of a circular saw blade, mounted on an arbor, that is driven by an electric motor. The drive mechanism is mounted below a table that provides support for the material, usually wood, being cut, with the blade protruding up through the table into the material.

<span class="mw-page-title-main">Sawmill</span> Facility where logs are cut into lumber

A sawmill or lumber mill is a facility where logs are cut into lumber. Modern sawmills use a motorized saw to cut logs lengthwise to make long pieces, and crosswise to length depending on standard or custom sizes. The "portable" sawmill is simple to operate. The log lies flat on a steel bed, and the motorized saw cuts the log horizontally along the length of the bed, by the operator manually pushing the saw. The most basic kind of sawmill consists of a chainsaw and a customized jig, with similar horizontal operation.

<span class="mw-page-title-main">Japanese saw</span> Cutting tool

The Japanese saw or nokogiri (鋸) is a type of saw used in woodworking and Japanese carpentry that cuts on the pull stroke, unlike most European saws that cut on the push stroke. Japanese saws are the best known pull saws, but they are also used in China, Iran, Iraq, Korea, Nepal and Turkey. Among European saws, both coping saws for woodworking and jeweler's saws for metal working also cut on the pull stroke like Japanese saws. Cutting on the pull stroke is claimed to cut more efficiently and leave a narrower cut width. On the other hand, a pull stroke does not easily permit putting one's body weight behind a stroke. This can be readily solved by using a vice or clamping. Another disadvantage, due to the arrangement and form of the teeth, is that Japanese saws do not work as well on hardwoods as European saws do. Japanese saws were originally intended for comparatively soft woods like cypress and pine whereas European saws were intended for hard woods like oak and maple.

<span class="mw-page-title-main">Radial arm saw</span> Cutting machine

A radial arm saw is a cutting machine consisting of a circular saw mounted on a sliding horizontal arm. Invented by Raymond DeWalt in 1922, the radial arm saw was the primary tool used for cutting long pieces of stock to length until the introduction of the power miter saw in the 1970s.

<span class="mw-page-title-main">Bandsaw</span> Power saw with a long, sharp blade

A bandsaw is a power saw with a long, sharp blade consisting of a continuous band of toothed metal stretched between two or more wheels to cut material. They are used principally in woodworking, metalworking, and lumbering, but may cut a variety of materials. Advantages include uniform cutting action as a result of an evenly distributed tooth load, and the ability to cut irregular or curved shapes like a jigsaw. The minimum radius of a curve is determined by the width of the band and its kerf. Most bandsaws have two wheels rotating in the same plane, one of which is powered, although some may have three or four to distribute the load. The blade itself can come in a variety of sizes and tooth pitches, which enables the machine to be highly versatile and able to cut a wide variety of materials including wood, metal and plastic.

<span class="mw-page-title-main">Crosscut saw</span> Type of saw optimized for cutting across wood fibres

A crosscut saw is any saw designed for cutting wood perpendicular to (across) the wood grain. Crosscut saws may be small or large, with small teeth close together for fine work like woodworking or large for coarse work like log bucking, and can be a hand tool or power tool.

A ripsaw is a wood saw that is specially designed for making a rip cut, a cut made parallel to the direction of the wood grain.

<span class="mw-page-title-main">Miter saw</span> Mechanical saw used to obtain precise angle cuts

A miter saw or mitre saw is a saw used to make accurate crosscuts and miters in a workpiece by positioning a mounted blade onto a board. A miter saw in its earliest form was composed of a back saw in a miter box, but in modern implementation consists of a powered circular saw that can be positioned at a variety of angles and lowered onto a board positioned against a backstop called the fence.

<span class="mw-page-title-main">Backsaw</span> Hand saw with a stiffened back

A backsaw is any hand saw which has a stiffening rib on the edge opposite the cutting edge, enabling better control and more precise cutting than with other types of saws. Backsaws are normally used in woodworking for precise work, such as cutting dovetails, mitres, or tenons in cabinetry and joinery. Because of the stiffening rib, backsaws are limited in the depth to which they can cut. Backsaws usually have relatively closely spaced teeth, often with little or no set.

<span class="mw-page-title-main">Quarter sawing</span> Woodworking process

Quarter sawing or quartersawing is a woodworking process that produces quarter-sawn or quarter-cut boards in the rip cutting of logs into lumber. The resulting lumber can also be called radially-sawn or simply quartered. There is widespread confusion between the terms rift sawn and quarter sawn with the terms defined both with opposite meanings and as synonyms.

This glossary of woodworking lists a number of specialized terms and concepts used in woodworking, carpentry, and related disciplines.

<span class="mw-page-title-main">Riving knife</span> Safety device installed on woodworking saws

A riving knife is a safety device installed on a table saw, circular saw, or radial arm saw used for woodworking. Attached to the saw's arbor, it is fixed relative to the blade and moves with it as blade depth is adjusted.

Rift sawing is a woodworking process that aims to produce lumber that is less vulnerable to distortion than flat-sawn lumber. Rift-sawing may be done strictly along a log's radials—perpendicular to the annular growth ring orientation or wood grain—or as part of the quarter sawing process.

<span class="mw-page-title-main">Chainsaw mill</span> Type of sawmill incorporating a chainsaw

A chainsaw mill or PortaMill or Logosol sawmill is a type of sawmill incorporating a chainsaw, that is used by one or two operators to mill logs into lumber for use in furniture, construction and other uses. Although often used as a generic term, Alaskan Mill is a registered trademark of Granberg International.

<span class="mw-page-title-main">Wood splitting</span> Process of cleaving wood into lumber along the grain

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.

A swingblade sawmill utilizes a single circular sawblade which pivots about a 90 degree point, to saw in both vertical and horizontal planes. The single blade travels horizontally in one direction down the log, and returns in vertical position, thus removing a sawn piece of timber. The swingblade head unit is normally mounted on a moving frame that travels along a track or tracks, up and down a stationary log.

References

  1. "Rip v. 2." def. 2.a., "cut v." def. 7.a., "rive v.1." def. 4 and "kerf" def 2.a. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009