Natural Materials
Natural materials are the ones engineering did not invent — but engineers still specify them, and for good reasons. Wood has a stiffness-to-weight ratio close to aluminum along the grain, damps vibration, insulates, machines fast and is the only structural material that grows back. Stone is the reference surface for flatness and mass. Cork, leather and wool felt are compliant, breathable and self-lubricating in ways no polymer quite matches. The trade-off is variability: properties change with grain direction, species, moisture and even the tree, so the tables here show typical ranges, not certified minimums, and the drawing should specify the grade and the moisture content.
Natural materials by type
HardwoodsDeciduous species · oak, maple, walnut, ash, beech, birch, teak, mahogany12—Furniture, cabinetry, flooring, tool handles, fixtures, prototype product parts and anything visible — dense, hard-wearing, fine-grained and machinable to crisp detail; teak and white oak for outdoor and marine work.
SoftwoodsConifers · pine, Douglas fir, spruce (SPF), cedar, redwood6—Framing, crates, pallets, shipping blocks, patterns and low-cost fixtures — light, cheap, fast to cut and nail; cedar and redwood resist rot outdoors; Douglas fir for strength.
Engineered wood panels & beamsPlywood, MDF, OSB, particleboard, hardboard, LVL, glulam, CLT, bamboo ply9—CNC-routed fixtures, jigs, templates and enclosures (MDF, Baltic birch plywood); cabinet carcasses and displays; structural beams and panels (LVL, glulam, CLT); packaging (OSB) — flat, stable and uniform where solid wood is not.
Natural stoneGranite, marble, slate, limestone, sandstone, basalt, quartzite, soapstone10—Surface plates and machine bases (granite), countertops and cladding (granite, marble, quartzite), roofing and flooring (slate), carving and memorials (marble, limestone), laboratory and chemistry benches (soapstone) — cut, ground and polished with diamond tooling.
Cork, leather & feltNatural and composition cork · vegetable- and chrome-tanned leather · SAE wool felt11—Gaskets, seals, anti-vibration pads, wipers, polishing and burnishing pads, oil wicks (cork, felt); straps, grips, holsters, cases and trim (leather); die-cut, laser-cut or skived to shape.
Choose a natural material for
Fixtures, jigs, patterns, crates and shipping supports (plywood, MDF, hardwood); furniture, cabinetry, display, retail and architectural components (hardwoods, veneered panels, bamboo); prototype and low-volume enclosures and product parts with a warm finish; surface plates, countertops, cladding and memorials (granite, marble, slate); gaskets, seals, wipers, polishing pads and anti-vibration mounts (cork, felt); straps, grips, cases and wear-facing trim (leather); laser-cut signage, inlays and models.
Look elsewhere when
The part needs certified, repeatable properties (metals and engineering plastics), dimensional stability across humidity (wood moves 0.1–0.3 % per 1 % moisture change across the grain — use MDF, plywood or a polymer), long outdoor life without maintenance (aluminum, stainless, HDPE), fire resistance, food-contact hygiene under regulation, or fine tolerances (±0.2 mm is realistic on wood; stone is ground to microns but only on flat faces). Leather and felt creep and compress permanently under sustained load.
Loading the library…
AI suggestions — verify with an engineer before ordering. Estimates are indicative; the quote page prices your exact geometry.
Manufacturing notes
- CNC routing and machining
- Hardwoods, plywood and MDF route quickly to ±0.2 mm with sharp compression and down-cut tooling; grain direction sets the finish and the risk of tear-out, so we orient stock to the part. Stone is machined with diamond tooling under water — flats to a few microns on granite, edges and profiles routine. Cork, leather and felt are die-cut, laser-cut or knife-cut rather than milled.
- Laser cutting and engraving
- Plywood, MDF, hardwood veneer, cork, leather and felt laser-cut and engrave cleanly for signage, inlays, models, gaskets and product trim; edges char slightly on wood (a design feature or a light sanding). Stone laser-engraves for marking; PVC-backed materials are not lasered.
- Design for wood
- Wood moves: allow for 0.1–0.3 % dimensional change per 1 % moisture change across the grain and almost none along it, so specify moisture content (6–8 % for indoor, 12 % outdoor), use floating or slotted joints, and choose plywood or MDF where flatness and stability matter more than appearance. Tolerances of ±0.2 mm are realistic; tighter on engineered panels than on solid stock.
- Joining
- Adhesives (PVA, polyurethane, epoxy), screws, threaded inserts, dowels and traditional joinery for wood; epoxy and mechanical anchors for stone; contact adhesive and stitching for leather; adhesive backing for cork and felt gaskets. Nothing here welds.
- Finishing
- Oil, lacquer, polyurethane, wax, stain, paint and veneer for wood; honed or polished faces and sealed surfaces for stone; dyed, embossed, edge-painted and burnished leather; cork and felt used as-cut or bonded to a backing. Fire-retardant and moisture-resistant grades of MDF and plywood are available where codes require them.
Natural Material — frequently asked
Hardwood or plywood for a CNC-routed part?
Plywood (Baltic birch in particular) for fixtures, jigs, enclosures and anything that must stay flat and be routed with fine detail on both faces — it is dimensionally stable, uniform and cheaper per part. Solid hardwood when the part is visible, needs an edge that can be shaped and finished, or must be strong along its length (handles, legs, rails). MDF for templates, patterns and painted parts where weight and edge chipping are acceptable.
Which woods survive outdoors?
Teak, white oak, cedar, redwood, black locust and ipe resist rot and insects naturally; everything else needs pressure treatment or a maintained finish. Marine-grade plywood uses waterproof glue and void-free veneers. Even the durable species move with the seasons, so outdoor joinery is designed to drain and to allow movement, and fasteners are stainless or bronze.
Why does the data for wood show ranges instead of numbers?
Because wood is a natural, anisotropic material: strength and stiffness along the grain are 10–20 × those across it, and vary with species, density, moisture, knots and growth rate. Published values are typical clear-specimen averages, not minimums a supplier certifies. For structural work the design codes (NDS, Eurocode 5) give allowable stresses by species group and grade — specify those, not a datasheet number.
What is granite used for in a machine shop?
Surface plates, straightedges, squares and machine bases — because it is stable, hard, non-magnetic, damps vibration, does not rust or burr, and can be lapped to flatness of a few microns over a metre. Granite also machines and polishes well for countertops and cladding. Marble is softer and stains; quartzite is as hard as granite with a lighter colour.
Can you make gaskets from cork, felt or leather?
Yes — die-cut, laser-cut or knife-cut from sheet in the thickness you need. Cork and cork-rubber composition for oil-pan, cover and low-pressure flange gaskets and anti-vibration pads; SAE wool felt for wipers, wicks, seals against dust and polishing pads (F-1 hard for wear, F-3 medium, FA blends for cost); leather for straps, seals in vintage equipment and wear-facing trim. Send the DXF and the sheet grade.