The centrifugal clutch is the link between the engine and the chain. If the engine spins fast enough the centrifugal force on the weights overcomes the force being applied by the spring, and the weights are slung outward. Once the engine is spinning fast enough, there is no slip in the clutch.
There are deep grooves in the bar to keep the chain from flying off the bar and to keep the chain cutting straight. Gently file the materials of the bar, clutch drum, clutch shoes, sprocket, chain dogs, and teeth. Draw a chainsaw bar and chain as they are cutting a block.
The clue is in the name! A chainsaw has two main parts: a saw blade built into a chain, wrapped around a long metal guide bar, and a small, one-cylinder gasoline engine. Chainsaw helmets with visors offer some protection; so too do chainsaw uniforms. Wayne’s Chainsaw Museum: A short video tour of Wayne Sutton’s chainsaw museum in the United States, will hundreds of saws dating from about the 1930s.
The typical centrifugal clutch has weights, springs, shoes, and a drum. While the engine is off or running at a low RPM the springs of the clutch are able to hold the weights in a neutral position, as the engine RPM increases the weights due to centrifugal force are becoming heavier and eventually over power the springs and start so engage the clutch. This is called clutch engagement, at this RPM no real work can be completed but as the RPMs continue to increase greater force is applied to bring the load up to speed and transfer all the power of the engine to the load. This allows work to be completed with the transmission of power nearly identical to that of a direct connected device.
how does a chainsaw clutch work Related Question:
How do I know if my chainsaw clutch is worn out?
Does the engine loose revs, or the engine keep revving and just the chain stops? If the engine is still running at normal revs, and the chain slows down, then it’s a problem with the clutch. Worn out, gummed up, jammed springs etc. If the engine looses revs under load then it’s more likely a fuel or carb problem.
Can you start a chainsaw without a clutch?
A clutch is an absolute necessity on a chainsaw. Without one, the chain sprocket would be connected directly to the motor, and the chain would turn even when the engine is idling.
Why is the chain on my chainsaw not spinning?
The chain tension may be too tight. Easy fix, just loosen the bar-retaining nuts and rotate the tensioning screw counterclockwise to the correct tension. Then tighten the nuts back up.
Why is it so hard to pull start my chainsaw?
If your chainsaw is hard to pull, here are some common causes: The pully system is snagged or stuck. The starter assembly is stuck or sticky. The housing may be damaged.
Why do chainsaws have clutches?
The clutch allows the engine to turn freely at low rpm [rpm=revolutions (turns) per minute] without moving the chain. They are separate. Unlike a four wheeler or truck, the chainsaw operator doesn’t have to engage the clutch or put the chainsaw in gear.
What does a centrifugal clutch do?
A centrifugal clutch is a mechanical device which is used on driven rotary equipment. Most commonly used with a combustion engine, the clutch can be used to automatically transmit the torque from the drive to the driven equipment giving a “soft start” with no load engagement.
What is a centrifugal clutch on a chainsaw?
The centrifugal clutch is the link between the engine and the chain. The clutch’s purpose is to disengage when the engine is idling so that the chain does not move. When the engine speeds up (because the operator has pulled the throttle trigger to begin cutting), the clutch engages so that the chain can cut.
What does a clutch drum do?
The transmission drum is an important part of an automatic transmission. It connects the transmission’s central or sun gear to the exterior half of the clutch pack. Manual transmissions do not require transmission drums because manually operated gears slide along shafts to engage or disengage.
Why does my chainsaw stick?
Chain tension Indeed, if a chainsaw chain that slackens with wear no longer cuts, it damages the guide, tires the engine and can be the cause of a blockage when it is too tight. In addition, the more the chain saw heats up, the more the tension of the links decreases, until they become too relaxed.
Which way does a chainsaw chain rotate?
The correct direction for a blade to face is with the pointy edge of the blade teeth facing toward the way the blade rotates. Essentially, you want the pointy edges of the blades rotating on top of the chain bar, moving toward the tip of the bar, and away from the body of the machine.
Do you oil a chainsaw clutch?
Although the clutch shoes of a Stihl chainsaw should never be greased, the needle bearing that fits inside the chain sprocket, which is part of the clutch mechanism, may need occasional lubrication.
Why is my chainsaw squealing?
Make sure you remove the clutch as running the saw with just the drum removed will take out the brake band. It is most likely the needle bearing if it squeals at idle but if it does it when revving then the clutch will be meshed to the clutch so must be the crank bearings!
Why does my chainsaw smoke when cutting?
This most commonly is a result of a dull chain and exerting to much pressure on the bar and chain trying to make the chain saw cut. This could also be either a lack of bar and chain oil ( tank empty, restricted oiler hole ) or an inferior type of oil that is being slung off the chain and not lubricating.
Why is my chainsaw burning the wood?
Your chainsaw burns wood because of poor lubrication Lubrication allows the mechanical parts to coordinate much better by avoiding a phenomenon of friction which risks causing traces of burns. This is one of the main reasons that your appliance gives off too much heat and that the wood burns.
How long does it take to Unflood a chainsaw?
The first option is the easiest since it doesn’t require any effort on your part, it just takes time. Many people wonder if a flooded chainsaw will fix itself? The answer is yes, but not always. By letting the chainsaw sit for about 20 minutes it will allow some of the fuel inside the engine to evaporate.