How does a chainsaw work?
STOP Here are some basic safety rules you should always follow when using a chainsaw.
1. Never work alone & make sure someone knows you are working & they have a estimated return home time 2. Make sure you have the correct safety equiptment as well as your chainsaw being in top condition 3. Never air drop start a chainsaw 4. Never park a vihacle anywhere near the drop zone of whatever you are cutting 5. Don’t try to use a chainsaw in bad weather conditions, especially with strong winds, heavy rain & lightning 6. Always size up potential situations before begining any type of chainsaw work 7. Don’t use a chainsaw with a power head above shoulder height 8. When using a chainsaw make sure you’re securly stood 9. Always use both hands 10. Always activate the chainsaw break before walking around with a running chainsaw 11. Never remove built in safety features 12. Always warn people around you when you’re about to fall a tree 13. Make sure you’re not tired and have good health 14. Plan for emergency situations
Eye Goggles
Helmet
Ear Protection
Face Sheild
Thick Protective Gloves
Padded Reinforced Trousers
Padded Reinforced Jacket
Steel Capped Thick Leather Boots
What Is A Chainsaw? A Chainsaw is a portable mechanical saw used for felling trees as well as other various jobs. It does this via a set of metal teeth which are attached to a rotating chain along a guide bar.
A Brief Chainsaw History
1785 - A chain handsaw model appears in John Aitken’s ‘Principles of Midwifery or Puerperal Medicine’. The fine serrated chain is used to remove diseased bone.
1926 - Andreas Stihl patents two person saws, one 116 pound electric model & a 139 pound gas model in 1929 1941 - US troops bring chainsaws home from Europe to be imitated 1945 - Development of aluminium alloys & forged steel parts leads to one person chainsaws 1947 - Inspired by timber beetle larvae, which chew both across & with wood grain, Joseph Buford Cox invents the Cox Chipper Chain 1949 - McCulloch Motors Corp debuts the world’s lightest chainsaw, the 25 pound model 3-25 1964 - Stihl introduces its first antivibration handle which uses buffer elements to absorb vibrations coming from the engine & chain. 1973 - Husqvarna creates the automatic chain break - a lever that stops the chain after kickback 1980 - Husqvarna debuts the 40, which has a crankcase made of lightweight composite materials. In 1983 the company introduces the 154, which has multiple plastic parts 2011 - Stihl’s Wood Boss produces 50% fewer emissions
When the chainsaw comes into contact with the tree, the metal saw chain sets to work. It uses a system of sharp metal teeth to saw the wood of the tree. The motor makes the chain spin around the guide bar which makes the chain’s teeth cut into the wood.
Parts
Front
Sawchain
Oil Reservoi Fun Facts The amber snail has razerteeth that act in the same way as a chainsaw
Bar
Muffler
Handle Starting Pull Handle Air Filter Cover Rear Hand Guard/ Safety Switch
ir
Fan
Trigger Fuel Tank/ Fuel Cap
Housing To The Fan
The Engine 2 3 8 1
4
5 6
7
1. The Gas Tank - All the energy used for powering the chainsaw comes from here. The typical tank holds about 0.5L of petrol (cars hold 12x more). 2. The Carburettor - Fuel feeds through here to mix with air. 3. The Cylinder - The air fuel mix passes through this cylinder via two stroke action. It is then ignited by a spark plug so it burns & releases energy which pushes the piston back & forth. 4. Connecting Rod & Crank - This converts the back & forth motion of the piston to rotary motion. 5. Drive Shaft - Takes power to the centrifugal clutch. 6. The Clutch - Prevents the chain from spinning all the time when the engine is on, it connects to the engine to stop the motion & save energy. 7. Gears - Carry power from the clutch to the sproket that holds the chain. 8. The Guide Bar - A long steel plate that the chain spins around that spits out sawdust as it goes.
Which chainsaw Material: Metal and Plastic 2 Stroke engine
Chainspeed 13.9 m/s Motor power 1600w Kickback break
Petrol
Chain Speed
Tank Capacity
Weight
Break
13.9 m/s
0.56 Litres
6.75 Kg
Kickback
is right for you ? Anti kickback function
Cable length: 6 Metres
Electric
Chainspeed 13.5 m/s
Automatic oil lubrication Power Output 2,000w Chain Speed
Tank Capacity
13.5 m/s
95 Minute Charge Time
Weight
Break
6.4 Kg
Kickback
Chainsaw Chainsaw Cuts Crooked
If the bar and sprocket are okay it means that the cutters are at different angles or the chian is longer or sharper at one side. What to do: Refile the teeth and reset the depth gauges, also check the bar rails and the tang clearance.
Chain Dulls Quickly
If this happens it is most commonly because there is thin or feathered cutting edges , this is caused by holding the handle too low or pressing down to hard. also a misaligned , worn or wrong pitched socket could be the problem What to Do: Refile the cutters at a five degree angle and also check and lower the depth gauges.
Chain Binds
If the chain binds it is caused by holding the file at an incorrect angle- less than 35 degress- or letting it drift during use. What to do: refile with a steady hand.
Troubleshooting Chain Overheats
Overheating is usually caused by a back slope of cutters. This happens when you hold the handle of the file too low which means the teeth are too high when cutting. What to Do: Have the chain reground by a proffessional.
Chain Jerks
This occurs because of a forward hook on the cutters because of excessive downward pressure. What to do: Have the chain reground by a proffessional.
Chain Slops in Guide Bar
This probably means the bar rails are spread too far apart or the drive links are bottoming into the groove. What to do: If the rails are spread, hit them into shape. If this doesn’t work the bar must be replaced or regroooved on a barrebuilding machine.
What to use a Chainsaw For Chainsaws can be used with a number of materials:-
Wood: Chiansaws are used mainly for wood, with forresters and lumberjacks as it speeds up their jobs. Ice: A chainsaw is used to create ice sculptures and cut through thick layers of ice. Concrete: special chainsaws can be used to cut trhough concrete. The cutting edges of the saw are embedded with diamond grit and the chian is supplied with a constant running of water because of the high friction involved.
To create wooden owl sculptures
What Not to use a Chainsaw For A chainsaw must NOT be used for anything other than the reasons on the left as this resorts to accidents and dangerous events occurring.
Created By Victoria Smith, Harry Benwell and Erin Balfour