Teeth remove chips; the kerf is the wood they remove

Sawing is a Separating process: each tooth removes a small chip, and successive teeth make a slot. The slot's width is the kerf. The space ahead of a tooth, called the gullet, carries chips out of the cut.

Many steel saw teeth have set: teeth bend slightly to alternating sides so the cut is wider than the blade body. Carbide-tipped circular blades commonly get that clearance from tips wider than the steel plate instead. Set and kerf are related, but they are not the same measurement.

This page explains cutting concepts. For operation, use Machine Hazards and Housekeeping and Equipment Operating Procedure.

Rip along the grain; crosscut across the fibers

A rip cut runs along the grain, usually to reduce a board's width. A crosscut runs across the grain, usually to reduce its length. Describe the cut relative to the grain, not just as a long or short cut.

Ripping teeth commonly have a flat, chisel-like cutting edge. Crosscut teeth commonly have alternating bevels that score and sever fibers at the sides of the cut. These are useful patterns, not universal rules: combination and specialty blades use other arrangements.

Supporting detail: Addendum 1 — Why tooth geometry changes the surface.

Balance tooth count, chip space and hook angle

For circular blades of the same diameter, more teeth generally share the work into smaller bites at the same feed and rotational speed. That can improve a crosscut surface, but leaves less space for chips. Thick ripping cuts often benefit from fewer teeth and larger gullets. “Thicker wood needs more teeth” is not a general rule.

Band and reciprocating blades commonly specify teeth per inch (TPI). Tooth spacing must suit the thickness engaged in the cut. A coarse blade has more chip space; a finer blade can suit thinner stock and finer work. Blade width also matters on a band saw: a narrower blade can follow a tighter curve.

Hook angle describes the tooth face's lean relative to a radial line on a circular blade. More positive hook generally gives a more aggressive bite; low or negative hook is less aggressive. Machine type and the blade maker's intended application matter along with the desired finish. A ripping blade is not automatically appropriate on a miter saw.

See Feeds and Speeds for the relationship between tooth engagement, feed and cutting speed; metal-cutting settings do not transfer directly to wood.

Supporting detail: Addendum 2 — Blade terminology reference.

Count cuts before calculating strip yield

Start with the usable width after any edge preparation. Let W be usable board width, s the required strip width and k the kerf, all in the same units. These ideal layouts assume straight cuts, exact dimensions and no extra finishing allowance.

One cut per strip, leaving an offcut: used width = n(s + k). The maximum whole number is floor(W / (s + k)); “floor” means round down. For a 12 in board, 3 in strips and a 1/8 in kerf, floor(12 / 3.125) = 3 strips. Three cuts use 9.375 in, leaving 2.625 in. Four strips alone use 12 in, leaving no room for the cuts.

All final pieces use both original outside edges: W = ns + (n − 1)k for an exact partition. There are only n − 1 cuts between n pieces. If a layout leaves an extra offcut to separate, count that extra cut too. Draw the layout before choosing a formula.

Real layouts also allow for defects, edge trimming and later machining. Kerf is material removed, not useful strip width.

Practice strip yield Practice cuts between pieces Practice the remaining width

Match the cut to a suitable starting machine

Read How Saws Cut Wood before choosing a saw blade. Table saws can crosscut as well as rip; jig saws and scroll saws are not band saws.

Practice resaw selection Practice interior cuts

Router bits make profiles and channels; templates repeat shapes

A router spins a router bit. Straight or spiral bits make channels and pockets; roundover and chamfer bits change an edge's profile. A bearing-guided bit or guide bushing can follow a template, which is a pattern used to reproduce an outline.

Routers may be handheld, mounted in a table or moved by a CNC machine. A shaper commonly carries profile cutters on a table-mounted spindle. Both shape wood, but their cutters and mounting systems are not interchangeable merely because the resulting profile looks similar.

Supporting detail: Addendum 3 — Why “router bit” is more useful than “end mill” here.

Practice template selection

Spindle and faceplate turning put grain differently relative to the axis

In typical spindle turning, grain runs mainly parallel to the rotation axis, as in a handle or table leg. In typical faceplate or bowl turning, grain runs mainly across the axis, as in a bowl blank. Faceplates and chucks are workholding methods; the name alone does not guarantee the grain orientation.

Turning removes material to make circular features. It does not bend the wood. Lathe Operations explains metal-lathe operations as a separate topic; wood turning has different tools and workholding practices.

Choose a drill bit for the hole's bottom, edge and diameter

A drill press improves control of axis and depth; it does not make every bit suitable for every hole. Cutter geometry, workpiece support and setup still affect accuracy.

Practice bit selection

A jointer establishes flatness; a planer establishes thickness

Stock is the material a part starts from. Rough lumber may have uneven surfaces or warp. A jointer removes material to establish a flat face. With that face as a reference against a square fence, it can establish a straight edge at 90° to the face.

A thickness planer cuts the upper face relative to the face supported by its bed. With a flat reference face down, it makes the opposite face parallel and brings the board to thickness. Jointing both faces separately does not ensure they are parallel.

Supporting detail: Addendum 4 — Why a planer alone can preserve a bow.

Build reference surfaces in order: face, edge, thickness, width, length

This is the geometry sequence for preparing rough stock. It assumes enough material remains for the finished dimensions and that the stock fits the equipment. It is not a machine setup guide; use Equipment Operating Procedure and Machine Hazards and Housekeeping for operation.

1. Face-joint: establish a flat face and mark it as the reference.
2. Edge-joint: use the reference face to establish one straight edge square to it.
3. Plane: place the reference face against the planer bed and bring the opposite face parallel to it at the required thickness.
4. Rip: use the straight reference edge to locate the cut; make the opposite edge parallel at the required width.
5. Crosscut: establish a square end, then cut the other end to the required length.

Any preliminary breakdown into shorter, oversized blanks comes before final sizing. Leave allowance for the later cuts; an early rough crosscut is not the final crosscut in this sequence.

Practice the milling order Practice the reference face

Separate the bending step from the cutting and bonding steps

Bending changes the shape of wood and belongs to Forming. A complete route can use several of the five process categories: cutting thin strips or kerfs is Separating; bonding layers is Fabricating. Veneering bonds a thin wood facing to a supporting base, so it is not automatically a bending operation.

Wood remains in the Wood & Composites material family. See Manufacturing Process Categories for the process model. Wood structure, moisture and engineered-wood products belong to the wood-as-a-material topic; here the question is how to obtain a shape.

Steam makes suitable wood more bendable; the form holds the curve

Heat and moisture soften the wood's lignin-rich matrix, allowing the piece to deform more readily. The wood does not become a liquid. It is bent around a form, a shaped support, and held while it cools and dries. Clear, straight-grained white oak and ash are common candidates; species alone does not guarantee a successful bend.

The outside of a bend tends to stretch while the inside compresses. Too much stretching can split the outer fibers; too much compression can wrinkle the inner face. Grain deviations, drying history, moisture, thickness and bend radius all matter. A larger radius is a gentler bend. There is no single radius-to-thickness ratio that works for every piece.

Supporting detail: Addendum 5 — Why heat and moisture work together.

These are process concepts, not steaming-equipment instructions. Equipment use belongs with Equipment Operating Procedure and Machine Hazards and Housekeeping.

Bent lamination uses thin strips and adhesive to retain a curve

Thin strips bend more easily than one solid piece of the same total thickness. Bent lamination brings prepared strips together with adhesive over a form, then restrains them until the bond has developed as specified for that adhesive. The strips commonly run with their grain along the curve. Alternating grain direction is not a requirement of bent lamination.

Springback is the tendency for a bend to open when restraint is removed. It can occur in both steam-bent and laminated parts. Thinner laminations can reduce springback for a given total thickness and curve, but adhesive behavior, layer count and material also matter. A trial bend establishes any form compensation; there is no universal correction percentage.

Do not rank every “hot/wet” part above every “cold/dry” part in strength. Compare the actual grain path, remaining section, bond quality, loading and service conditions.

Practice bending-route selection

Kerf bending trades an intact section for easier curvature

A series of partial-depth slots on the inside of the intended curve leaves a thin continuous web on the outside. The slots narrow as the piece bends. Slot depth and spacing, the remaining web and the desired radius determine how it deforms.

This method can suit curved coverings where the slotted side is concealed. It also removes load-carrying material. Filling or bonding the slots does not automatically restore the properties of the original uncut board. A backing or supporting structure may be part of the design; structural performance needs its own justification.

Veneer follows a prepared substrate; it does not replace it

Veneer is a thin wood layer. A substrate is the base it is bonded to. Veneering puts a chosen grain appearance over that base and can cover a flat surface or an appropriate curved form. The substrate must have the intended shape and a sound, even bonding surface.

In book matching, adjacent veneer leaves are opened like book pages to make a mirrored pattern. In slip matching, leaves are placed beside one another in the same orientation for a repeated pattern. Neither arrangement is the same as alternating structural grain directions through a panel's thickness.

Unequal face and back construction can encourage a panel to warp. Veneer thickness, grain, adhesive and the balancing back layer belong in the layup design. Glue selection and detailed bonding methods belong to wood fabrication; engineered panels belong to the material topic.