Chainsaw Safety: How To Cut A Fallen Tree Without Pinching Chainsaw

Can you cut a fallen tree without pinching the chainsaw? Yes, you absolutely can, and with the right knowledge and techniques, you can significantly reduce the risk of chainsaw binding.

Dealing with a fallen tree, whether it’s from a storm or due to natural decay, is a common task for landowners and outdoor enthusiasts. While exciting, this endeavor comes with inherent risks, and one of the most common and dangerous is chainsaw binding, often referred to as a chainsaw pinch. This happens when the tree, under its own weight or shifting, clamps down on the chainsaw bar, trapping the saw. This blog post is your comprehensive guide to fallen tree removal with an emphasis on safe chainsaw wood cutting, helping you avoid chainsaw binding and master felling techniques for efficient chainsaw operation. We’ll cover essential chainsaw safety tips, cutting logs safely, and proper cutting methods to ensure you are equipped for the job. Think of this as your deep dive into logging practices for the everyday user, focusing on preventing chainsaw kickback and the dreaded pinch.

The Dangers of Chainsaw Pinch

A chainsaw pinch isn’t just an inconvenience; it’s a serious safety hazard. When the saw gets stuck, the operator might try to force it out, leading to loss of control, potential for preventing chainsaw kickback, and severe injury. The sudden stop can also damage your chainsaw. Therefore, understanding how to approach a fallen tree is paramount.

Assessing the Fallen Tree: Your First Step

Before even thinking about starting your chainsaw, a thorough assessment of the fallen tree is critical. This is where your felling techniques begin, even though the tree is already down.

What to Look For:

How the tree is resting: Is it supported on one end? Is it lodged against another object? Is it balanced precariously?
Tension and Compression Zones: This is the most crucial aspect of understanding how to cut a fallen tree without a pinch. Every piece of wood under stress has areas of compression (where the wood is squeezed) and tension (where the wood is stretched). Cutting into a compression zone without support can cause the wood to close in on the saw.
Obstacles: Are there any rocks, branches, or other debris that could interfere with your cuts or your escape path?
Slope of the Ground: This affects your footing and your ability to control the saw.
Direction of Fall: While the tree is already down, its original fall direction can give clues about how it might be resting and where stresses are located.

Identifying Compression and Tension

Imagine a branch or trunk resting on the ground. The part that’s touching the ground is generally under compression. The part curving upwards is under tension. When a tree falls, its weight creates these forces throughout the entire trunk.

Table 1: Identifying Stress Zones in a Fallen Tree

Stress Zone	Description	What Happens When You Cut
Compression	This is the side of the log where the wood is being squeezed together. For a tree resting on the ground, the underside is typically in compression. If a log is supported by another object, the area pressing against that object is in compression.	Cutting into a compression zone without adequate support from the opposite side can cause the wood to close in on the chainsaw bar, leading to a pinch. The wood essentially tries to spring back to its natural, uncompressed state.
Tension	This is the side of the log where the wood is being stretched apart. For a tree resting on the ground, the upperside is typically in tension. If a log is suspended between two points, the underside is in tension.	Cutting into a tension zone without proper support can cause the wood to spring open, creating a gap. While this is less likely to cause a pinch, it can still make cutting logs more difficult and can increase the risk of preventing chainsaw kickback if the bar snags.
Neutral Axis	This is an imaginary line running through the center of the log where there is neither compression nor tension.	Cuts made precisely at the neutral axis are generally the safest, as they are least likely to result in pinching or opening up. However, accurately identifying the neutral axis can be challenging in practice.

Essential Chainsaw Safety Gear

Before we dive into cutting techniques, let’s reinforce the importance of personal protective equipment (PPE). This is non-negotiable for safe chainsaw operation.

Helmet: With a face shield and hearing protection.
Eye Protection: Safety glasses or goggles that meet ANSI Z87.1 standards.
Hearing Protection: Earplugs or earmuffs.
Chainsaw Gloves: For better grip and protection.
Chainsaw Chaps or Protective Trousers: Designed to stop a moving chain.
Steel-Toed Boots: With slip-resistant soles.

Proper Cutting Techniques to Avoid Binding

The key to avoid chainsaw binding lies in understanding the stress within the log and making your cuts accordingly. There are two primary cutting methods: the “bucking cut” (cutting across the diameter of the log) and the “limbing cut” (cutting branches off the main trunk). We’re primarily concerned with bucking here.

The Two-Cut Method: Your Best Defense

The safest way to cut through a log without pinching your chainsaw is to use a two-cut method. This method accounts for the compression and tension forces within the wood.

Scenario 1: Log Supported at Both Ends, Sagging in the Middle

This is a common scenario. The top of the log is under tension, and the bottom is under compression.

Begin with the Top Cut (Undercut/Relief Cut):
- Start by making a cut from the top of the log.
- This cut should go about one-third of the way through the log’s diameter.
- Crucially, make this cut on the tension side.
- Why this is important: By cutting into the tension side first, you relieve some of the stretching force. This prevents the wood from closing in on the bar as you make the final cut.
Make the Bottom Cut (Back Cut):
- Now, move to the bottom of the log.
- This cut should go from the underside of the log upwards, meeting the first cut.
- This cut should go through the remaining two-thirds of the log’s diameter.
- Important: Do NOT cut past the first cut. Your goal is to meet it cleanly.
- Why this is important: As you cut from the bottom, the weight of the log will now be supported by the uncut portion from your top cut. The tension relief from the first cut allows the log to remain stable and not pinch the saw.

Visualizing the Cuts:

Imagine cutting a piece of bread. If you try to cut it all the way through from one side, the loaf might sag and make the cut uneven. But if you make a shallow cut from the top, then finish from the bottom, you have more control.

Scenario 2: Log Supported at One End (Cantilevered)

In this case, the unsupported end is under tension, and the supported end is under compression.

Begin with the Top Cut (Undercut):
- Make a cut from the top of the log.
- This cut should go about one-third of the way through the log’s diameter.
- Make this cut on the tension side of the unsupported section.
- Why this is important: Again, relieving the tension first prevents the log from pinching the saw as you complete the cut.
Make the Bottom Cut (Back Cut):
- Move to the underside of the log.
- Cut from the bottom upwards, meeting the first cut.
- This cut should go through the remaining two-thirds of the log.
- Important: Ensure your footing is stable and you have a clear escape path.

Scenario 3: Log Supported at Both Ends (or lodged)

This is where careful assessment is most critical. The forces can be complex.

Assess the Lodgement: Determine exactly what is supporting the log and how it’s being compressed.
Cut the Compression Side First (with caution): In some cases, if the log is very firmly lodged and under significant compression, you might need to start with a shallow cut on the compression side.
- Make a shallow cut (no more than 10-20% of the log’s diameter).
- This cut is on the compression side.
- Purpose: This cut aims to create a small relief for the compressed wood.
- Caution: This is a risky cut. Be ready to back the saw out if it feels like it’s binding.
Make the Tension Side Cut:
- Once the shallow compression cut is made, move to the tension side.
- Make your primary cut from the tension side downwards, meeting the first cut.
- Why this is important: By cutting the tension side, you’re more likely to have the log remain stable.

When in doubt, or if the forces are unclear, it’s often best to find a way to support the log to relieve pressure before cutting. You can use wedges or props to do this.

Techniques for Specific Cutting Situations

Cutting logs requires adapting your proper cutting methods to the log’s position.

Bucking a Log Lying Flat on the Ground

Identify the underside (compression) and upperside (tension).
If the log is well-supported by the ground, the underside is generally compressed.
Make your first cut (undercut) on the top (tension side), about one-third of the way down.
Follow with your second cut (back cut) from the bottom, meeting the first.

Bucking a Log Supported by Another Log or Obstruction

This creates significant compression on the side of the log resting on the obstruction.
Crucially, assess where the pressure is.
If the log is compressed against the obstruction, you might need to cut the tension side first (usually the top).
Make a shallow cut from the top (tension side) about one-third of the way down.
Then, make a second cut from the bottom, meeting the first.
If the log is held in place and you can’t easily assess the tension/compression, consider using wedges to create space and relieve pressure before cutting.

Bucking a Log Suspended in the Air (e.g., lodged in branches)

This is a high-risk situation for pinching. The log wants to spring in unpredictable ways.
The top of the suspended log is generally under compression, and the bottom is under tension.
Start with the bottom cut (tension side): Make a cut from the bottom, about one-third of the way through the log’s diameter.
Then, make your second cut from the top, meeting the first. This second cut will be on the compression side.
Be prepared for movement: As you cut the first side, the log might shift. Keep your chainsaw chain sharp and be ready to withdraw it.

Advanced Techniques and Tips for Safe Chainsaw Operation

Mastering chainsaw operation involves more than just knowing how to make a cut.

Sharp Chains: A sharp chain cuts efficiently, reducing the force needed and the risk of the saw stalling and binding. Always maintain a sharp chain.
Proper Chain Tension: Too loose a chain can derail; too tight a chain causes excess wear and can lead to binding. Consult your chainsaw manual for correct tension.
Use the Bumper Spikes (Dog): Engage the bumper spikes against the wood for leverage and stability, especially when making your initial cut. This helps prevent the saw from jumping.
Chainsaw Wedges: These are indispensable tools for fallen tree removal. As you make your cut, you can insert wedges into the kerf (the slot made by the saw chain) to hold the cut open and prevent the wood from closing in. They are a primary tool for avoiding chainsaw binding.
- When to use wedges: Primarily on the compression side of the cut. Insert them as soon as there’s enough space.
- Types of wedges: Plastic and aluminum wedges are common. They are softer than the saw’s metal components and won’t damage the chain.
Never Cut Through the Entire Log with One Pass: This is a recipe for disaster. Always aim for the two-cut method.
Maintain Control: Keep both hands firmly on the chainsaw handles. Keep your body balanced.
Clear Your Work Area: Ensure you have a clean, unobstructed path to retreat if needed.
Watch for Springback: After a cut is completed, the wood can sometimes snap or shift suddenly as stored energy is released.
Felling Techniques for Directional Control: While this article focuses on cutting fallen trees, if you are dealing with a tree that is partially felled or needs to be directed, you would apply specific felling techniques to control the fall direction. However, for trees already on the ground, the principles of managing tension and compression are paramount.

What to Do If Your Chainsaw Gets Pinched

Don’t panic! Here’s how to safely deal with a pinched chainsaw:

Turn Off the Engine: Immediately switch off the chainsaw.
Assess the Situation: Look at how the saw is trapped. Is it the tip, the middle, or the heel of the bar that’s bound?
Check for Tension: Can you see which side of the log is pushing on the bar?
Use Wedges: If possible, try to insert a wedge into the kerf on the side that is applying pressure. Hammer it in firmly.
Relieve Pressure: If the log is resting on something, try to remove the obstruction or support the log on the opposite side to relieve pressure on the saw. You might need a pry bar or a sturdy branch for leverage.
Back the Saw Out: Once some pressure is relieved, gently try to pull the chainsaw straight back out of the kerf. Do not try to force it.
If Still Stuck: If it’s severely bound, you may need to make a relief cut on the opposite side of the kerf, in the direction that will open the cut, to release the pressure. This is a more advanced maneuver and should only be attempted if you feel confident. If not, it might be time to call for professional help.

Frequently Asked Questions (FAQ)

Q: What is the most common mistake when cutting fallen trees?

A: The most common mistake is not assessing the tension and compression in the log, leading to improper cutting order and chainsaw binding.

Q: Can I use my chainsaw to cut a log that is supported at only one end?

A: Yes, but you must be extra careful. Always start your cut on the tension side (usually the top) about one-third of the way through, then complete the cut from the bottom.

Q: What are chainsaw bumper spikes used for?

A: Chainsaw bumper spikes (also called dogs) are metal teeth located near the bar nose. They dig into the wood to provide leverage, stability, and control, preventing the saw from jumping.

Q: How do I know which side of the log is in tension and which is in compression?

A: Generally, the side of the log that is bending upwards or away from a support is in tension. The side being squeezed against the ground or an object is in compression. Visual cues and how the wood behaves when you test it with a light touch can help.

Q: When should I use chainsaw wedges?

A: Chainsaw wedges are most useful when cutting logs that are under pressure, especially in compression zones. Inserting a wedge into the cut as you make it helps keep the kerf open, preventing the saw from binding.

Q: Is it safe to cut a log that is resting on uneven ground?

A: It’s less safe. Uneven ground can lead to unpredictable shifts in the log’s support and the distribution of tension and compression. Take extra time to assess the situation and consider supporting the log with props to create a more stable cutting platform.

Q: How do I prevent chainsaw kickback when cutting logs?

A: Preventing chainsaw kickback involves maintaining a firm grip with both hands, keeping the saw close to your body, and being aware of the bar nose. Never let the tip of the bar contact anything while the saw is running. Also, avoid cutting with only the tip of the bar.

Q: What are the basic principles of safe chainsaw operation?

A: Basic principles include wearing full PPE, maintaining your chainsaw (sharp chain, proper tension, clean air filter), being aware of your surroundings, having a clear escape route, and always using the correct cutting techniques for the situation.

Q: Should I always start cutting from the top of a fallen tree?

A: Not necessarily. You should start your first cut on the tension side of the log. This is often the top, but depending on how the log is supported, the tension side could be elsewhere.

Conclusion

Safely tackling a fallen tree with your chainsaw is achievable by respecting the forces at play within the wood. By thoroughly assessing the situation, always wearing your safety gear, employing the two-cut method to manage tension and compression, and using tools like chainsaw wedges, you can significantly avoid chainsaw binding and make your chainsaw wood cutting tasks safer and more efficient. Remember, patience and proper technique are your greatest allies in fallen tree removal and safe chainsaw operation. Practice these proper cutting methods, and you’ll become more adept at handling these challenging jobs, ensuring your logging practices are sound and your chainsaw safety tips are always at the forefront.