Meta tags:

Headings (most frequently used words):

cutting, safety, mechanism, chainsaw, contents, history, construction, maintenance, working, techniques, see, also, references, external, links, in, surgery, for, wood, engine, drive, guide, bar, chain, tensioning, features, as, sawmill, stone, concrete, ice, and, brick, underwater, work,

Text of the page (most frequently used words):
the (392), and (156), chain (89), chainsaw (72), from (58), for (57), saw (53), chainsaws (48), #cutting (48), with (44), bar (41), are (33), needed (32), citation (31), safety (29), retrieved (28), this (27), wood (27), archived (27), cut (26), used (26), when (26), tree (24), edit (24), original (24), may (23), log (23), was (21), use (20), oil (19), can (19), tools (18), saws (18), october (17), hand (17), plane (17), which (17), two (16), power (15), operator (15), engine (15), equipment (14), powered (14), small (14), one (14), have (14), clutch (14), links (13), history (13), felling (13), electric (13), 2024 (12), other (12), features (12), gasoline (12), these (12), into (12), bars (12), that (12), articles (11), carving (11), machine (11), vibration (11), 2021 (11), they (11), but (11), guide (11), tension (11), direction (11), drive (11), 2025 (10), has (10), jeffray (10), article (10), wikipedia (9), 2023 (9), concrete (9), fuel (9), also (9), most (9), through (9), main (9), sprocket (9), nose (9), link (8), how (8), timber (8), gauge (8), forestry (8), fire (8), after (8), more (8), developed (8), move (8), made (8), help (8), fall (8), were (8), typically (8), using (7), sawmill (7), axe (7), garden (7), portable (7), popular (7), 2016 (7), james (7), underwater (7), top (7), working (7), due (7), sharp (7), each (7), between (7), modern (7), teeth (7), around (7), additional (6), commons (6), page (6), all (6), woodworking (6), national (6), construction (6), techniques (6), sawing (6), miter (6), joints (6), clamp (6), speed (6), turning (6), stihl (6), bucking (6), lawn (6), manual (6), hole (6), clothing (6), during (6), september (6), 2018 (6), pmid (6), journal (6), off (6), like (6), three (6), excision (6), park (6), moving (6), kickback (6), cuts (6), special (6), chains (6), remove (6), stone (6), out (6), must (6), side (6), safe (6), while (6), depth (6), first (6), tooth (6), full (6), learn (6), cover (6), either (6), mechanism (6), carburetor (6), toggle (5), about (5), long (5), wayback (5), june (5), 2011 (5), different (5), held (5), control (5), workers (5), crosscut (5), bow (5), limbing (5), types (5), hydraulic (5), hook (5), wedge (5), health (5), april (5), issn (5), medical (5), doi (5), part (5), stroke (5), gas (5), provide (5), material (5), early (5), injury (5), cases (5), steel (5), risk (5), driven (5), work (5), not (5), blade (5), large (5), ice (5), such (5), binds (5), prevent (5), end (5), bottom (5), within (5), too (5), common (5), heavy (5), without (5), centrifugal (5), tensioning (5), contents (4), search (4), you (4), august (4), sections (4), needing (4), volume (4), maintenance (4), wikiproject (4), references (4), short (4), scottish (4), logging (4), states (4), frame (4), building (4), institute (4), finger (4), laminated (4), cross (4), world (4), scotland (4), hedge (4), forest (4), diameter (4), 2014 (4), 2017 (4), training (4), starting (4), occupational (4), engines (4), com (4), medicine (4), critical (4), january (4), become (4), trees (4), books (4), now (4), war (4), published (4), edinburgh (4), company (4), moreau (4), see (4), include (4), brick (4), usually (4), operated (4), public (4), because (4), less (4), been (4), lubricated (4), called (4), branches (4), bind (4), weight (4), avoid (4), reduce (4), should (4), run (4), operate (4), many (4), operation (4), where (4), cause (4), very (4), handles (4), cordless (4), air (4), time (4), pump (4), lower (4), length (4), today (4), message (4), please (4), some (4), brake (4), handle (4), drum (4), tipped (4), here (4), century (4), surgery (4), bone (4), hide (4), sidebar (4), table (3), view (3), available (3), under (3), wikimedia (3), categories (3), category (3), wikidata (3), 2020 (3), cleanup (3), unsourced (3), multiple (3), issues (3), november (3), united (3), international (3), splitting (3), whipsaw (3), mill (3), american (3), steam (3), edge (3), surface (3), hammer (3), compass (3), thickness (3), square (3), hinge (3), chisel (3), carpentry (3), throwing (3), series (3), lumberjack (3), events (3), trimmer (3), firewood (3), science (3), 2013 (3), husqvarna (3), december (3), final (3), pdf (3), ethanol (3), 2022 (3), echo (3), www (3), pmc (3), induced (3), body (3), california (3), new (3), mechanics (3), will (3), logs (3), via (3), google (3), know (3), systems (3), 1918 (3), issued (3), patent (3), 1883 (3), carious (3), john (3), aitken (3), 1785 (3), plate (3), generally (3), guard (3), appropriate (3), water (3), low (3), professional (3), divers (3), supplied (3), occur (3), dangerous (3), than (3), edges (3), high (3), holes (3), parts (3), damage (3), designed (3), specialized (3), clearing (3), compression (3), section (3), properly (3), way (3), line (3), set (3), intended (3), before (3), having (3), another (3), since (3), operators (3), especially (3), protective (3), normally (3), require (3), machinery (3), rubber (3), lighter (3), easier (3), models (3), protect (3), their (3), tends (3), blunt (3), metal (3), produce (3), outlet (3), style (3), lead (3), being (3), although (3), motor (3), gauges (3), protects (3), size (3), including (3), idle (3), loose (3), adjusted (3), tensioner (3), any (3), bolts (3), allow (3), petrol (3), battery (3), late (3), became (3), handheld (3), file (3), north (3), america (3), had (3), german (3), his (3), instrument (3), subsection (3), languages (2), contact (2), privacy (2), policy (2), terms (2), statements (2), covered (2), wikify (2), pages (2), introduction (2), description (2), gardening (2), org (2), quarter (2), association (2), federation (2), british (2), drying (2), bending (2), paint (2), french (2), parquetry (2), marquetry (2), intarsia (2), binding (2), chamfer (2), groove (2), rebate (2), tenon (2), knee (2), coping (2), butt (2), box (2), router (2), jointer (2), japanese (2), block (2), veneer (2), jigsaw (2), circular (2), bucksaw (2), bandsaw (2), band (2), framing (2), impact (2), float (2), plastic (2), board (2), african (2), blackwood (2), fir (2), root (2), lumber (2), championship (2), skills (2), competitions (2), hot (2), pole (2), textile (2), mining (2), measuring (2), alignment (2), masonry (2), metalworking (2), kitchen (2), abrasive (2), cleaning (2), leaf (2), edger (2), auger (2), spade (2), rake (2), pruning (2), shears (2), post (2), polesaw (2), mattock (2), machete (2), hori (2), grass (2), billhook (2), winch (2), skidder (2), man (2), head (2), brush (2), suppression (2), angle (2), planting (2), boots (2), related (2), external (2), 2009 (2), rev (2), service (2), guidebook (2), 2006 (2), edition (2), federal (2), directive (2), program (2), drop (2), 2008 (2), 2007 (2), carbon (2), monoxide (2), hazards (2), current (2), march (2), injuries (2), 2010 (2), free (2), white (2), fingers (2), 722 (2), environmental (2), associated (2), commercial (2), diving (2), mix (2), sign (2), best (2), care (2), trim (2), shape (2), corporation (2), 978 (2), isbn (2), harvesting (2), lennox (2), doug (2), dundurn (2), 175 (2), book (2), answers (2), firefighters (2), matching (2), 2019 (2), need (2), wsl (2), industry (2), pioneer (2), shand (2), culture (2), review (2), frederick (2), magaw (2), seufert (2), dorothy (2), heine (2), press (2), jstor (2), 454 (2), print (2), flexible (2), surgical (2), 1806 (2), observations (2), principles (2), midwifery (2), puerperal (2), invention (2), done (2), suitable (2), much (2), occurs (2), method (2), tip (2), achieved (2), overall (2), similar (2), example (2), removing (2), buildings (2), structure (2), motors (2), sculpture (2), natural (2), boards (2), specially (2), mills (2), art (2), quickly (2), inches (2), along (2), removed (2), pressure (2), area (2), tensions (2), started (2), then (2), offside (2), toward (2), gravity (2), lifts (2), able (2), reach (2), trapped (2), point (2), sufficient (2), releases (2), bend (2), retreat (2), directional (2), make (2), form (2), narrow (2), opposite (2), desired (2), sitback (2), moves (2), back (2), several (2), consider (2), might (2), its (2), fell (2), safely (2), effective (2), lands (2), cord (2), result (2), materials (2), springs (2), introduced (2), further (2), noise (2), industrial (2), falling (2), even (2), event (2), still (2), user (2), operating (2), intake (2), filter (2), sawdust (2), well (2), soil (2), needs (2), force (2), applications (2), pumped (2), ends (2), take (2), towards (2), lubrication (2), thrown (2), reservoir (2), same (2), refueling (2), wear (2), particularly (2), faster (2), electrical (2), contains (2), problems (2), older (2), only (2), logger (2), content (2), keep (2), rear (2), derails (2), located (2), stop (2), underneath (2), manufacturers (2), making (2), built (2), design (2), adding (2), fatigue (2), engaging (2), screw (2), moved (2), lateral (2), tensioners (2), difficult (2), does (2), wheel (2), left (2), handed (2), pitch (2), inch (2), every (2), effect (2), solid (2), commonly (2), exchangeable (2), slot (2), tank (2), variety (2), runs (2), increased (2), fixed (2), stops (2), connected (2), wheels (2), cold (2), contribute (2), orientation (2), carburetors (2), higher (2), unit (2), ratio (2), cylinder (2), type (2), onwards (2), 1926 (2), successful (2), cable (2), fires (2), ltd (2), earliest (2), patents (2), carrying (2), granted (2), patented (2), what (2), important (2), mass (2), them (2), produced (2), dolmar (2), osteotome (2), wooden (2), diseased (2), paper (2), 1782 (2), symphysiotomy (2), 19th (2), rotating (2), sources (2), citations (2), improve (2), talk (2), appearance (2), upload (2), changes (2), read (2), english (2), norsk (2), bahasa (2), беларуская (2), create (2), account (2), donate (2), menu (2), add, topic, mobile, cookie, statement, statistics, developers, code, conduct, legal, contacts, disclaimers, text, apply, site, agree, registered, trademark, non, profit, organization, foundation, inc, creative, attribution, sharealike, license, rendered, parsoid, last, edited, 2026, utc, hidden, vague, ambiguous, geographic, scope, containing, cs1, value, webarchive, template, inventions, habitat, management, methods, https, index, php, title, oldid, 1371411319, yale, lux, nara, israel, czech, republic, japan, gnd, authority, databases, green, frameless, panel, rift, flat, hewing, conversion, framers, guild, society, engravers, carvers, caricature, architectural, woodwork, woodturners, organizations, finishing, stain, preservation, wax, varnish, thermal, stripper, lacquer, heat, polish, adhesive, treatments, purfling, oystering, banding, piecing, ovolo, ogive, ogee, bevel, bead, profiles, tongue, splice, scarf, rabbet, mortise, mason, lap, headed, halved, dovetail, dado, crown, thorns, butterfly, bridle, biscuit, birdsmouth, geometry, surform, spokeshave, smoothing, shoulder, scrub, razee, moulding, jack, grooving, fore, bedrock, planes, scroll, ripsaw, keyhole, fretsaw, backsaw, sawbuck, pipe, holdfast, gripe, flooring, clamps, workbench, scribe, winding, sticks, warrington, vise, planer, try, combination, carpenters, shaving, horse, shaper, sandpaper, rasp, milling, mallet, janka, hardness, test, driver, bender, gimlet, fence, drill, drawknife, burnisher, adze, abrasives, composite, plywood, particle, osb, mdf, hardboard, glue, engineered, zebrano, willow, wenge, walnut, utile, totara, teak, sapele, rubberwood, rosewood, red, quebracho, ramin, ovankol, purpleheart, poplar, plum, pear, padauk, oak, meranti, maple, mahogany, merbau, lovoa, linden, lime, basswood, lignum, vitae, jelutong, jarrah, iroko, ipê, imbuia, idigbo, hornbeam, hickory, hazel, eucalyptus, elm, ebony, cumaru, cocobolo, chestnut, cherry, cedrela, camphor, bubinga, boxwood, australian, birch, bilinga, beech, balsa, avodire, aspen, apple, ash, anigre, andiroba, alder, afromosia, hard, yew, spruce, rimu, pine, kauri, larch, juniper, douglas, cypress, cedrus, calocedrus, cedar, soft, woods, woodturning, whittling, treen, spindle, shipbuilding, shingle, weaving, segmented, relief, pyrography, pallet, crafting, millwork, luthier, kohlrosing, khatam, fretwork, ébéniste, chip, certosina, caning, cabinetry, bush, arrow, boat, styles, glossary, overviews, players, paul, bunyan, days, championships, timbersports, southern, conclave, european, woodsman, chopping, climbing, logrolling, caber, toss, basque, aizkolaritza, sports, string, blower, irrigation, sprinkler, hose, brushcutter, plough, sweeper, mower, aerator, earth, dethatcher, cultivator, wheelbarrow, weeder, watering, trowel, loy, sickle, shovel, scythe, riddle, secateurs, potting, bench, digger, pitchfork, pickaxe, loppers, kirpi, homi, hoe, stitcher, grafter, fork, dibber, daisy, grubber, broadfork, averruncator, woodchipper, kiln, whoopie, sling, tsakat, tyer, stump, grinder, flume, pond, house, moulder, debarker, mulcher, railway, processor, denailer, swing, yarder, donkey, washington, skid, cone, pike, pickaroon, peavey, lombard, hauler, truck, helicopter, harvester, devil, forwarder, feller, buncher, cant, resaw, hacksaw, dragsaw, tomahawk, maul, marking, splitter, labrys, hatchet, shake, froe, broadaxe, axes, pulaski, rakehoe, mcleod, helitack, retardant, flapper, driptorch, uavs, aerial, firefighting, prism, caliper, relascope, microtome, laser, rangefinder, increment, borer, inclinometer, hemispherical, photography, tape, cruising, rod, biltmore, stick, scanner, mensuration, tuley, tube, shelter, dibble, seed, trap, trainer, pottiputki, groasis, waterboxx, hoedag, hoedad, caulk, afforestation, 1951, works, media, 230v, 115, 1549, 2012, jonsered, 1153137, 95rev, usda, february, course, student, register, dan, dangers, approved, intelligence, bulletin, 2983, syndrome, centers, disease, prevention, preventing, removal, disaster, 1999, hsqglobal, incorporated, mastersofthechainsaw, masters, gemne, 1994, pathophysiology, vibrating, suppl, 7708114, 0027, 7622, nagoya, bovenzi, franzinelli, mancini, cannavà, maiorano, ceccarelli, nov, 1995, 730, 8535491, 1128352, 1351, 0711, 1136, oem, dose, response, relation, vascular, disorders, krajnak, kristine, 334, 30583715, 6415671, 1521, 6950, 1080, 10937404, 1557576, 2018jtehb, 320k, bibcode, 320, toxicology, reviews, effects, exposure, arm, whole, prodivertc, los, angeles, times, regulators, phaseout, mowers, blowers, ban, homeowners, landscaping, pro, mini, hinson, tamara, evening, standard, slice, prune, triffid, bushes, bonnier, 1977, 186, mcclain, troy, ebookit, 4566, 1229, expert, understanding, valuable, resource, 4597, 1817, dvids, hurricane, ready, stephen, northernwoodlands, autumn, major, warhistoryonline, wwii, germans, online, selector, everything, poulan, swiss, research, waldwissen, net, steady, growth, firsts, noted, 1972, age, bravodeluxe, hankering, guest, reid, mark, collin, 1920, 9894, canada, 186260a, wardrop, jim, 1976, columbia, experience, endless, 279780, wolf, rogers, fred, risse, guenter, 1980, schullian, osteom, notes, oxford, university, 465, 7005321, 24625567, 1093, jhmas, xxxv, allied, sciences, toronto, johnson, robert, scott, sippo, swan, kenneth, civil, 458, 20699757, 1097, 0b013e3181e4f297, 455, trauma, infection, analysis, archibald, constable, 1807, 5711164, translated, glasgow, scrymgeour, 2nd, lying, hospital, xii, fig, skippen, kirkup, maxton, mcdonald, 2004, 19878683, s2cid, 15209147, 0036, 9330, 1177, 003693300404900218, merriam, webster, definition, structures, bridge, pilings, pier, dock, timbers, interlocking, trigger, conditions, visibility, increase, precautions, procedures, required, fibrous, plunge, pushing, width, pushback, shifts, nearly, pinches, ordinary, dust, deep, walls, floors, chunks, pre, gaining, access, monuments, minimal, surrounding, recently, 230, volts, restoration, departments, friction, embedded, diamond, grit, cooled, fastened, bulk, planks, usage, alaskan, combinations, developments, sometimes, finland, winter, swimming, brushing, slashing, five, piler, follow, debris, stuck, bound, unsafe, carefully, compresses, entire, sideways, exerted, felled, setup, changing, compressions, worked, falls, allows, kerf, movement, indicate, wedges, winches, freeing, badly, fallen, maximum, locations, decide, safest, release, complicated, situations, straight, necessary, outside, base, undergrowth, path, degree, horizontal, nonexistent, lessens, finished, tenth, horizontally, slightly, above, begin, placing, pinching, sizeup, scouting, planning, danger, zones, paths, location, relative, objects, support, determines, splits, jam, factors, lean, wind, branch, arrangement, snow, load, obstacles, damaged, rotting, behave, unexpectedly, impossible, aim, goal, obstacle, technical, knowledge, federally, administered, codified, specifies, testing, certification, process, employees, unpaid, volunteers, who, dropping, pulling, violation, keeping, both, hands, stability, essential, expose, harmful, indoors, partially, enclosed, outdoor, areas, risks, mean, chaps, hearing, protectors, worn, jurisdictions, certified, licensed, breaks, poor, attempting, inappropriate, symptoms, damping, heated, newer, wield, brushless, decrease, compared, traditional, petroleum, deafness, tinnitus, situation, begins, complete, crushed, similarly, unplanned, harm, height, injured, accident, arises, catches, throws, upward, arc, serious, death, touching, snarling, synthetic, fibers, woven, garment, despite, forces, involved, fast, wearing, gear, collect, cleaned, clear, vibrations, pulls, itself, pressing, kept, perform, rapidly, touch, stones, tend, powdery, rather, longer, clean, shavings, characteristic, little, push, hardened, likely, contaminate, roots, tungsten, carbide, there, portion, aligned, inwards, depending, banana, separate, depleted, filled, enough, lack, incorrect, source, rapid, seizing, coming, addition, quite, thick, sticky, additives, amount, emergency, substitute, lost, leaving, tackifier, viscosity, lubricate, life, dissolves, leads, workaround, problem, fresh, dry, downed, encyclopedic, wikivoyage, wikibooks, wikiversity, rewrite, instructions, advice, micro, close, gap, lift, space, chips, lets, slower, nonprofessional, aggressive, shallower, catcher, resembles, aluminum, shortens, derailing, swings, prevents, hitting, hits, instead, activator, forward, upper, activated, triggered, stopping, milliseconds, capitol, christmas, nickel, dime, based, tips, specifically, sponsors, consistent, improvement, taken, place, over, years, better, ergonomic, reducing, antivibration, underside, locates, helps, carry, engages, inside, drives, track, increases, allowing, slows, lubricating, correct, easily, hold, pull, nuts, tight, otherwise, derail, advantage, mount, disadvantage, nearby, attach, neither, nor, comes, position, exhaust, integrated, segment, constructed, riveted, takes, folded, tab, chromium, plated, angular, curved, corner, beveled, right, alternated, varying, defined, half, spanned, consecutive, rivets, 325, fits, conventional, complement, skip, raker, rides, ahead, limits, 025, slow, filed, becomes, prone, kick, vibrate, excessively, uncomfortable, detrimental, rollers, bicycle, reduces, consumer, wears, consist, layers, put, secured, number, determined, grease, filling, match, sends, producers, 043, 050, 058, 063, pulled, basically, elongated, round, resistant, guides, loop, rarely, encountered, alloy, modified, suit, pictured, attachment, catch, expands, increasing, sits, jobs, 2500, 2700, rpm, engaged, reason, importantly, case, immediately, anti, system, physically, decouple, constructing, pieces, isolates, chassis, road, weather, icing, vent, cylinders, opened, pass, temperature, elements, resistive, heating, alternator, automobile, suspension, diaphragm, draws, alternating, differential, crankcase, fed, caused, stall, tilted, maintain, altitude, clogs, automatically, electronic, chambers, traditionally, 120, preferred, simplicity, internal, combustion, single, consists, seen, blades, 21st, remained, face, competition, 2010s, began, manufacturing, 2020s, eventually, market, share, state, restrictions, planned, trimming, lithium, invented, corded, sale, 1960s, never, commercially, limited, range, dependency, upon, presence, plus, proximity, socket, sharpeners, mounted, sizes, home, members, units, trained, fight, ventilate, military, engineer, operations, tractors, horses, utilized

Text of the page (random words):
he bar safety bars are laminated bars with a small sprocket at the nose the small nose reduces the kickback effect such bars are used on consumer saws cutting chain edit main article saw chain usually each segment in a chain which is constructed from riveted metal sections similar to a bicycle chain but without rollers features small sharp cutting teeth each tooth takes the form of a folded tab of chromium plated steel with a sharp angular or curved corner and two beveled cutting edges one on the top plate and one on the side plate left handed and right handed teeth are alternated in the chain chains are made in varying pitch and gauge the pitch of a chain is defined as half of the length spanned by any three consecutive rivets e g 8 mm 0 325 inch while the gauge is the thickness of the drive link where it fits into the guide bar e g 1 5 mm 0 05 inch the conventional full complement chain has one tooth for every two drive links full skip chain has one tooth for every three drive links built into each tooth is a depth gauge or raker which rides ahead of the tooth and limits the depth of cut typically to around 0 5 mm 0 025 depth gauges are critical to safe chain operation if left too high they cause very slow cutting if filed too low the chain becomes more prone to kick back low depth gauges also cause the saw to vibrate excessively vibration is uncomfortable for the operator and is detrimental to the saw citation needed tensioning mechanism edit main article tensioner the tension of the chain that does the cutting is adjusted so that it neither binds on nor comes loose from the guide bar the tensioner is either operated by turning a screw or a manual wheel the tensioner is either in a lateral position underneath the exhaust or integrated into the clutch cover citation needed lateral tensioners have the advantage that the clutch cover is easier to mount but the disadvantage that it is more difficult to reach nearby the bar tensioners through the clutch cover are easier to operate but the clutch cover is more difficult to attach citation needed when turning the screw a hook in a bar hole moves the bar either out tensioning or in making the chain loose tension is correct when it can be moved easily by hand and is not loose on the bar when tensioning hold the bar nose up and pull the bar nuts tight otherwise the chain might derail citation needed the underside of each link features a small metal finger called a drive link which locates the chain on the bar helps to carry lubricating oil around the bar and engages with the engine s drive sprocket inside the body of the saw the engine drives the chain around the track by a centrifugal clutch engaging the chain as engine speed increases under power but allowing it to stop as the engine speed slows to idle speed citation needed consistent improvement to overall chainsaw design including adding safety features has taken place over the years these include chain brake systems better chain design and lighter more ergonomic saws including fatigue reducing antivibration systems citation needed as chainsaw carving has become more popular manufacturers are making special short narrow tipped bars called quarter tipped nickel tipped or dime tipped bars based on the size of their tips some chainsaws are built specifically for carving applications 34 echo sponsors a carving series 35 safety features edit a chainsaw used to trim the 2016 u s capitol christmas tree main article chainsaw safety features today s chainsaws have multiple safety features to protect the operator these include citation needed chain brake a chain brake activator is located forward of the upper handle and is activated by a kickback event when triggered it tensions a band around the clutch drum stopping the chain within milliseconds a chain catcher is located between the saw body and the clutch cover in most cases it resembles a hook made of aluminum it is used to stop the chain when it derails from the bar and shortens the length of the chain when derailing the chain swings from underneath the saw towards the operator this prevents the chain from hitting the operator which hits the rear handle guard instead a rear handle guard protects the hand of the operator when the chain derails some chains have safety links as on micro chisel saws these links keep the saw close to the gap between two cutting links and lift the chain when the space at the safety link is full with saw chips which lifts the chain and lets it cut slower nonprofessional chains have less aggressive teeth by having shallower depth gauges maintenance edit this section contains instructions or advice wikipedia is not a guidebook please help rewrite such content to be encyclopedic or move it to wikiversity wikibooks or wikivoyage october 2023 learn how and when to remove this message a professional logger limbing a downed tree two stroke chainsaws require about 2 5 of oil in the fuel to lubricate the engine while the motor in electrical chain saws is normally lubricated for life most modern gasoline operated saws today require a fuel mix of 2 1 50 gasoline that contains ethanol can result in problems for the equipment because ethanol dissolves plastic rubber and other material 36 this leads to problems especially on older equipment a workaround for this problem is to run fresh fuel only and run the saw dry at the end of the work citation needed separate chain oil or bar oil is used for the lubrication of the bar and chain on all types of chainsaws the chain oil is depleted because it tends to be thrown off by chain centrifugal force on two stroke chainsaws the chain oil reservoir is usually filled up at the same time as refueling the reservoir is normally large enough to provide sufficient chain oil between refueling lack of chain oil or using an oil of incorrect viscosity is a common source of damage to chainsaws and tends to lead to rapid wear of the bar or the chain seizing or coming off the bar in addition to being quite thick chain oil is particularly sticky due to tackifier additives to reduce the amount thrown off the chain although motor oil is a common emergency substitute it is lost even faster leaving the chain less lubricated citation needed oil is pumped from a small pump to a hole in the bar from there the lower ends of each chain drive link take a portion of the oil into the gauge towards the bar nose the pump outlet and bar hole must be aligned since the bar is moving out and inwards depending on the chain length the oil outlet on the saw side has a banana style long shape citation needed chains must be kept sharp to perform well they become blunt rapidly if they touch soil metal or stones when blunt they tend to produce powdery sawdust rather than the longer clean shavings characteristic of a sharp chain a sharp saw also needs very little force from the operator to push it into the cut specially hardened chains made with tungsten carbide are used for applications where the soil is likely to contaminate the cut like cutting through roots citation needed a clear sign of a blunt chain is the vibrations of the saw a sharp chain pulls itself into the wood without pressing on the saw citation needed the air intake filter tends to collect sawdust it must be cleaned from time to time citation needed safety edit a user operating a gasoline powered chainsaw wearing full safety gear main articles chainsaw safety features and chainsaw safety clothing protective clothing is designed to protect operators in the event of a moving chain touching their clothing by snarling the chain and sprocket by using special synthetic fibers woven into the garment despite safety features and protective clothing injuries can still occur due to the large forces involved in the work from the fast moving sharp chain or the vibration and noise of the machinery 37 a common accident arises from kickback when a chain tooth at the tip of the guide bar catches on wood without cutting through it 38 this throws the bar with its moving chain in an upward arc toward the operator which can cause serious injury or even death citation needed a dangerous situation occurs when heavy timber begins to fall or move before a cut is complete the chainsaw operator may be trapped or crushed 39 similarly timber falling in an unplanned direction may harm the operator or other workers or an operator working at a height may fall or be injured by falling timber citation needed like other hand held machinery the operation of chainsaws can cause vibration white finger 40 tinnitus or industrial deafness these symptoms were very common before vibration damping using rubber or steel springs were introduced heated handles are additional help newer lighter and easier to wield cordless electric chainsaws use brushless motors which further decrease noise and vibration compared to traditional petroleum powered models citation needed the risks associated with chainsaw use mean that protective clothing like chainsaw boots chaps and hearing protectors are normally worn while cutting many jurisdictions require operators be certified or licensed to work with chainsaws where injury can also result if the chain breaks during operation due to poor maintenance or attempting to cut inappropriate materials citation needed gasoline powered chainsaws expose operators to harmful carbon monoxide gas especially indoors or in partially enclosed outdoor areas 41 drop starting or turning on a chainsaw by dropping it with one hand while pulling the starting cord with the other is a safety violation in most states in the u s 42 keeping both hands on the saw for stability is essential for safe chainsaw use citation needed safe and effective chainsaw and crosscut use on federally administered public lands within the united states has been codified since 2016 in the final directive for national saw program 43 issued by the united states forest service which specifies the training testing and certification process for employees and unpaid volunteers who operate chainsaws within public lands citation needed working techniques edit chainsaw training is designed to provide working technical knowledge and skills to safely operate the equipment 44 sizeup this is scouting and planning safe cuts for the felling direction danger zones and retreat paths before starting the saw the tree s location relative to other objects support and tension determines a safe fall splits off or if the saw will jam several factors to consider are tree lean and bend wind direction branch arrangement snow load obstacles and damaged rotting tree parts which might behave unexpectedly when cut a tree may have to fall in its natural direction if it is too dangerous or impossible to fell in a desired direction the aim is for the tree to fall safely for limbing and cross cutting the log the goal is to avoid having the tree fall on another tree or obstacle 45 felling after clearing the tree s base undergrowth for the retreat path and the felling direction felling is properly done with three main cuts to control the fall the directional cut line should run 1 4 of the tree diameter to make a 45 degree wedge which should be in the felling direction and horizontal the top cut should be made first and then the bottom cut to form the directional line at the wedge point a narrow or nonexistent hinge lessens felling direction control from the opposite side of the wedge the final felling cut is finished one tenth of the tree diameter from the direction cut line the felling cut is made horizontally and slightly 5 cm 2 in above the bottom cut when the hinge is properly set the felling cut will begin the fall in the desired direction 46 45 a sitback is when a tree moves back opposite the intended direction placing a wedge in the felling cut can prevent a sitback from pinching the saw freeing working a badly fallen tree that may have become trapped in other trees working out maximum tension locations to decide the safest way to release tension and a winch may be needed in complicated situations to avoid cutting straight through a tree in tension one or two cuts at the tension point of sufficient depth to reduce tension may be necessary after tension releases cuts are made outside the bend 45 limbing cutting the branches off the log the operator must be able to properly reach the cut to avoid kickback bucking cross cutting the felled log into sections setup is made to avoid binding the chainsaw within the changing log tensions and compressions safe bucking is started at the log high side and then sections worked offside toward the butt end the offside log falls and allows for gravity to help prevent binds the log s kerf movement while cutting can help to indicate binds additional equipment lifts bars wedges and winches and special cutting techniques can help prevent binds binds this is when the chainsaw is at risk or is stuck in the log compression a log bound chainsaw is unsafe and must be carefully removed to prevent equipment damage top bind the tension area on log bottom compression on top bottom bind the tension area on log top compression on bottom side bind sideways pressure exerted on the log end bind weight compresses the log s entire cross section brushing and slashing this is quickly clearing small trees and branches under five inches 13 cm in diameter hand piler may follow along to move out debris cutting edit chainsaws with specially designed bar and chain combinations have been developed as tools for use in chainsaw art and chainsaw mills specialized chainsaws are used for cutting concrete during construction developments chainsaws are sometimes used for cutting ice for example ice sculpture and winter swimming in finland citation needed as a sawmill edit when fastened into a special guide frame a chainsaw can be used as a portable sawmill to cut bulk wood into planks or boards such usage is called a chainsaw mill or alaskan sawmill citation needed cutting stone concrete ice and brick edit a water cooled chainsaw cutting concrete special chainsaws can cut concrete brick and natural stone these use similar chains to ordinary chainsaws but with cutting edges embedded with diamond grit they may use gasoline or hydraulic power and the chain is lubricated with water because of high friction and to remove stone dust the machine is used in construction for example in cutting deep square holes in walls or floors in stone sculpture for removing large chunks of stone during pre carving by fire departments for gaining access to buildings and in restoration of buildings and monuments for removing parts with minimal damage to the surrounding structure more recently concrete chainsaws with electric motors of 230 volts have also been developed 47 because the material to be cut is not fibrous much less kickback occurs so the most used method of cutting is plunge cutting by pushing the tip of the blade into the material with this method square cuts as small as the blade width...