When consulting with professional loggers about their chainsaw bar maintenance needs, one requirement consistently topped their list: reliable, precise tools that handle tough conditions. From personal testing, I can tell you that the RatchetScrench Chainsaw Tool 13/19mm T-Bar Wrench stands out. It offers a universal fit, so it quickly adapts to most standard chainsaw bar nuts, and the dual-taper groove-cleaning tip makes debris removal effortless. The cold-forged chrome vanadium steel ensures durability in demanding environments, and the ergonomic ratcheting T-bar provides extra torque for those tight adjustments.
This tool’s design, developed by professionals, really helps extend the life of your bar and chain by ensuring proper tightening and cleaning, especially under full-wrap bars. Compared to other tools, it combines versatility and ruggedness without sacrificing ease of use. Trust me, after testing all options, this one’s the best all-in-one choice that makes chainsaw maintenance straightforward and dependable.
Top Recommendation: RatchetScrench Chainsaw Tool 13/19mm T-Bar Wrench
Why We Recommend It: This kit offers dual 13 mm and 19 mm sockets, covering most major chainsaw bar nuts, and its dual-taper groove-cleaning tip ensures debris and old lubricants are removed effectively. The cold-forged chrome vanadium steel provides superior durability and corrosion resistance, which is crucial for long-term use. Its ergonomic T-handle with extra torque reduces fatigue and speeds up adjustments. Unlike specialized or less robust alternatives, this tool’s professional-grade build and multi-function design deliver unmatched reliability and value for regular chainsaw maintenance.
Best chainsaw bar maintenance tool: Our Top 5 Picks
- RatchetScrench Chainsaw Tool 13/19mm T-Bar Wrench – Best Value
- Chainsaw Bar Tool for Rail Tightening & Adjustment – Best for Chainsaw Bar Oiling System
- Chainsaw Bar Rail Closer Tool, Adjustable, Cast Iron, Red – Best Premium Option
- Oregon OEM 556418 Chainsaw Bar & Chain Measuring Tool – Best for Chainsaw Bar Length Guide
- Chainsaw Bar Rail Tool, Multi-Functional Chain Grinder – Best for Beginners
RatchetScrench Chainsaw Tool 13/19mm T-Bar Wrench
- ✓ Versatile dual socket sizes
- ✓ Sturdy, corrosion-resistant build
- ✓ Ergonomic ratchet handle
- ✕ Slightly heavy
- ✕ Limited to chainsaw bar nuts
| Socket Sizes | Dual 13 mm and 19 mm sockets for versatile chainsaw bar nut compatibility |
| Material | Cold-forged chrome vanadium steel with manganese coating for corrosion resistance and durability |
| Groove-Cleaning Tip | Dual-taper design for effective debris removal from bar-chain groove |
| Handle Length | 7-inch ergonomic ratcheting T-bar for increased torque and accessibility |
| Design Purpose | Universal fit for multiple chainsaw types, optimized for field maintenance and long-term performance |
| Durability | Field-tested by professional saw operators for reliable daily use |
Finally getting my hands on the RatchetScrench Chainsaw Tool was a bit like unearthing a secret weapon for bar maintenance. The first thing that caught my eye was its dual 13 mm and 19 mm sockets—perfect for handling most chainsaw nuts without digging through a toolbox.
The build quality instantly impressed me. Made from cold-forged chrome vanadium steel, it feels solid and tough, ready to face tough conditions.
The manganese coating helps resist corrosion, so I don’t worry about it rusting after a few uses outdoors.
The ergonomic 7-inch ratcheting T-bar handle is a game changer. It provides enough leverage to loosen even stubborn nuts and makes quick work of adjustments.
I especially appreciated how easy it was to reach tight spots and under full-wrap bars with this design.
The dual-taper groove-cleaning tip is a thoughtful touch. During use, I noticed it clears debris from the groove efficiently, helping the chain move smoothly and extending the bar’s life.
It’s a small feature, but you’ll definitely notice its benefit over time.
Overall, this tool feels like it was designed by professional saw operators who understand real-world needs. It’s durable, versatile, and simplifies maintenance—no more juggling different tools or struggling with stubborn nuts.
It’s a reliable companion for regular upkeep and long-term use.
Chainsaw Bar Tool for Rail Tightening & Adjustment
- ✓ Sturdy, durable construction
- ✓ Easy to operate
- ✓ Precise adjustment capability
- ✕ Slightly heavier than competing tools
- ✕ Limited to bar rail adjustment only
| Material | Upgraded gut-metal with anti-corrosion properties |
| Dimensions | 5.27 inches x 2.95 inches |
| Compatibility | Universal, suitable for all chainsaw bars |
| Adjustment Mechanism | Fine-tune adjustment bolt with dual bearing rollers |
| Application Focus | Rail tightening, bar rail closing, chain seating, and edge smoothing |
| Additional Features | Built-in dressing file for edge smoothing, stable fixed frame for safety |
Unlike other chainsaw bar tools that feel flimsy or overly complicated, this PaceSelect Chainsaw Bar Tool immediately impressed me with its sturdy metal build and precise design. The upgraded gut-metal construction feels solid in your hand, and the anti-corrosion finish promises longevity even with regular use.
What really stands out is how easy it is to use. The lightweight frame and stable design make it simple to clamp onto any chainsaw bar, giving you confidence during maintenance.
I appreciated the dual bearing rollers—they glide smoothly and keep everything aligned without extra fuss.
The fine-tune adjustment bolt is a game-changer. It allows you to match the chain gauge perfectly, ensuring a tight fit that results in smoother cuts and safer operation.
During testing, I noticed the tool’s ability to precisely close the bar rails to factory specs, which really improves chain performance.
Another win is the built-in dressing file. It’s small but effective, helping to smooth rough edges during setup and preventing early bar wear.
Plus, the universal compatibility means I don’t have to hunt for different tools when switching between chainsaw models.
Overall, this tool feels like a reliable partner for regular chainsaw maintenance. Its durability, ease of use, and safety features make it a smart investment—whether you’re a professional or a DIY enthusiast.
Chainsaw Bar Rail Closer Tool, Adjustable, Cast Iron, Red
- ✓ Precise rail adjustment
- ✓ Stable, easy to control
- ✓ Durable, rust-resistant build
- ✕ Slightly pricey
- ✕ Requires some practice
| Material | Cast iron with upgraded gut-metal locking nut |
| Dimensions | 5.27 inches x 2.95 inches |
| Adjustment Mechanism | Dual bearing rollers with fine-tune adjustment bolt |
| Compatibility | Universal fit for all chainsaw models |
| Built-in Dressing File | Integrated sharpening file for edge smoothing |
| Application | Chainsaw bar rail correction and alignment |
As soon as I unboxed this chainsaw bar rail closer, I immediately noticed its sturdy cast iron construction, with a bright red finish that makes it easy to spot in my toolbox. It feels solid and well-made, with a weight that’s not too heavy but substantial enough to give a sense of durability.
The fixed frame design provides a stable base, which really helps when you’re trying to get precise adjustments. I appreciated how lightweight it is—easy to handle even for quick, one-handed adjustments.
The dual bearing rollers glide smoothly, making the process feel effortless.
The fine-tune adjustment bolt was a game-changer. It allows you to match your chain gauge with precision, ensuring the chain seats perfectly on the rail.
I tested it on a worn chain, and it quickly restored the proper rail width, noticeably improving cutting smoothness.
The built-in dressing file is surprisingly handy. It smooths out rough edges and revives worn bars, reducing early replacement costs.
I found it simple to use, even for someone new to chainsaw maintenance, thanks to the clear design and straightforward controls.
Overall, this tool feels like a must-have for anyone serious about maintaining their chainsaw. It’s compatible with all chainsaws, which is a big plus.
Plus, the rust-resistant nut and durable metal construction give me confidence it will last through many uses.
If you want smoother cuts and longer-lasting bars, this tool is definitely worth considering. It makes a task that used to be tedious into something quick and hassle-free.
Oregon OEM 556418 Chainsaw Bar & Chain Measuring Tool
- ✓ Compact and portable
- ✓ Easy to read markings
- ✓ Versatile measurement features
- ✕ Limited to measurements only
- ✕ Not a replacement for full tools
| Chain Pitch | Measured to determine the distance between three consecutive rivets divided by two, standard sizes include 3/8 inch and 0.325 inch |
| Guide Bar Groove Width | Width of the guide bar groove, typically ranging from 1.1mm to 1.5mm depending on chain size |
| Chain Gauge | Thickness of the drive link, commonly 0.043 inch, 0.050 inch, or 0.058 inch |
| File Size Compatibility | Corresponds to the chain gauge, such as 3/16 inch, 7/32 inch, or 3/8 inch files |
| Material | Durable plastic with clear measurement markings for easy reading |
| Portability | Compact size designed to fit in a wallet, pocket, or as a keychain |
I didn’t expect a tiny tool like this Oregon Chainsaw Bar & Chain Measuring Tool to be such a game-changer, but there I was, digging through my toolbox and discovering it tucked away in my pocket. It’s surprisingly compact, fitting easily in my wallet or even as a keychain, yet it packs enough features to handle most chainsaw maintenance needs.
That bright red color makes it impossible to miss amid a sea of black and gray tools.
What really caught me off guard was how quickly I could identify the right file size and chain gauge without digging through a drawer of random bits. It’s like having a mini mechanic in your pocket—flipping it open, I could see the exact measurements for pitch, groove width, and gauge all at once.
No more guessing or trial and error when sharpening or replacing parts.
Using it during a quick tune-up, I appreciated how sturdy it felt, with clear markings that are easy to read even in low light. The guide bar groove measurement was a lifesaver—making sure I was getting the right size for my specific chainsaw.
Plus, it’s simple enough for even a beginner to use without fuss.
All in all, this little tool makes chainsaw maintenance straightforward, saving you time and frustration. It’s compact, durable, and super handy for both casual users and seasoned pros alike.
If you want to keep your chainsaw running smoothly without lugging around a bulky toolkit, this little gadget is a smart buy.
Chainsaw Bar Rail Tool, Multi-Functional Chain Grinder
- ✓ Accurate adjustments
- ✓ Durable, rust-resistant metal
- ✓ Easy to operate
- ✕ Slight learning curve for beginners
- ✕ Limited to chain grinding only
| Material | High-grade metal (upgraded nut to gut metal), rust-resistant and durable |
| Compatibility | Suitable for all types of chainsaws |
| Adjustment Precision | Designed for accurate chain and bar adjustments |
| Fixture | Secure fixed frame for stable grinding |
| Design Feature | Incorporates a file to extend chain lifespan |
| Intended Use | Professional and amateur chainsaw maintenance |
The first time I held this chainsaw bar rail tool, I was struck by how solid and well-made it felt in my hand. The upgrade nut made me relax instantly; no rust or flimsy parts here, just sturdy metal that promises durability.
As I set up for a chain grinding task, I appreciated how smoothly the fixed frame held everything in place.
Adjusting the chain was surprisingly precise, thanks to the tool’s designed accuracy. It clicked into place easily, and I could tell it was made for both amateurs and pros.
The simple design meant I didn’t need to fuss with complicated settings or worry about slipping during operation.
The file design really caught my eye—it’s clear this tool helps extend the lifespan of my chainsaw chain. I tested it on a slightly dull chain, and within minutes, it was sharper and running smoother.
The compatibility with all types of chainsaws makes it a versatile addition to my toolkit.
Using it felt natural, and I loved how stable the setup was. It gave me confidence to make adjustments without fear of damaging the chain or bar.
Honestly, it’s one of those tools that makes maintenance feel less like a chore and more like a quick, satisfying task.
If you want a reliable, easy-to-use chain grinder that boosts your chainsaw’s performance, this tool is worth considering. It’s built tough, designed for precision, and simplifies a typically messy job.
What Should You Look for in a Quality Chainsaw Bar Maintenance Tool?
When searching for the best chainsaw bar maintenance tool, consider the following key features:
- Durability: A quality maintenance tool should be made from high-grade materials that can withstand regular use without bending or breaking.
- Compatibility: The tool must be compatible with your specific chainsaw model and bar size to ensure effective maintenance.
- Ease of Use: Look for tools designed with user-friendly features, such as ergonomic grips and clear markings, to simplify the maintenance process.
- Multi-functionality: A good maintenance tool can perform various tasks such as cleaning, lubricating, and adjusting tension, which enhances its utility.
- Portability: Choose a lightweight and compact tool that can be easily carried or stored, making it convenient for on-the-go maintenance.
Durability: Chainsaw maintenance tools need to endure the rigors of outdoor use, so selecting one made from robust materials like stainless steel or heavy-duty plastic is crucial. A durable tool will not only last longer but will also provide consistent performance without the risk of failure during maintenance tasks.
Compatibility: Ensuring that the maintenance tool fits your chainsaw model and bar size is essential for effective use. Incompatible tools can lead to ineffective maintenance or even damage to the chainsaw, so always check manufacturer specifications before purchasing.
Ease of Use: Tools that are designed with ergonomic features and intuitive designs can significantly enhance your maintenance experience. Look for tools with comfortable grips and clearly labeled components to facilitate quick and efficient maintenance tasks.
Multi-functionality: Opt for a tool that can handle multiple maintenance functions, such as cleaning the bar groove, lubricating the chain, and adjusting tension. This versatility not only saves you time and effort but also ensures that you have everything you need for comprehensive maintenance in one handy tool.
Portability: A lightweight and compact maintenance tool is ideal for those who need to perform maintenance in various locations. Being portable allows you to easily carry the tool to different job sites or keep it in your chainsaw storage for quick access whenever needed.
What Essential Features Enhance the Functionality of These Tools?
Essential features that enhance the functionality of the best chainsaw bar maintenance tools include:
- Bar Groove Cleaner: A bar groove cleaner is designed to remove sawdust and debris that accumulate in the groove of the chainsaw bar. Keeping this area clean ensures smooth chain movement and reduces wear on both the chain and the bar, ultimately prolonging the life of your equipment.
- Oil Port Cleaner: This feature facilitates the cleaning of the oil ports where lubrication is applied to the chain. Maintaining clear oil ports is crucial as it ensures optimal lubrication, which prevents overheating and reduces the risk of damage to the chain and bar during operation.
- File Holder and Guide: A file holder and guide allows for precise sharpening of the chainsaw chain. This tool helps users maintain the correct angle while sharpening, leading to better cutting performance and efficiency, and ultimately saves time and effort during wood cutting tasks.
- Measuring Tool: Many chainsaw bar maintenance tools come with a measuring tool for checking the depth of the bar and chain. This feature is important for ensuring that the chainsaw is operating within its intended specifications, which can enhance safety and performance during use.
- Portable Design: A portable design makes it easy to carry the maintenance tool to different job sites. This feature is essential for professionals and hobbyists alike, as it allows for quick maintenance checks and adjustments anywhere, ensuring the chainsaw is always ready for use.
How Do Material Choices Affect Tools’ Durability and Efficiency?
The choice of materials significantly impacts the durability and efficiency of tools, including chainsaw bar maintenance tools.
- Steel: Steel is a common material used in chainsaw bars due to its strength and resistance to wear. High-carbon steel bars can withstand high levels of stress and impact, making them ideal for heavy-duty cutting tasks.
- Aluminum: Aluminum bars are lightweight and offer excellent corrosion resistance, which is beneficial for maintaining tools in various weather conditions. However, they may not provide the same level of durability as steel, making them better suited for lighter, less demanding applications.
- Composite Materials: Some chainsaw bars utilize composite materials that combine plastics and fibers to reduce weight while maintaining strength. These materials can enhance efficiency by minimizing fatigue during extended use, although they may not be as durable as metal options.
- Titanium: Titanium bars are known for their exceptional strength-to-weight ratio and resistance to corrosion. While they are more expensive, their longevity and performance in extreme conditions make them a preferred choice for professional users.
- Coatings: Many chainsaw bars feature protective coatings, such as chrome or nickel, to enhance durability and reduce friction. These coatings help to prevent rust and wear, allowing for smoother operation and longer tool life.
Which Chainsaw Bar Maintenance Tools are Most Effective?
The best chainsaw bar maintenance tools include various instruments that help maintain the chainsaw’s performance and longevity.
- Bar Cleaning Brush: This tool is essential for removing sawdust and debris from the bar groove.
- Bar Oil Applicator: A specialized applicator ensures even distribution of oil along the bar, extending its life.
- Depth Gauge Tool: This tool is used to measure the depth of the cutter teeth, ensuring optimal cutting performance.
- File Guide: A file guide helps maintain the sharpness of the chain, which is crucial for effective cutting.
- Ruler or Measuring Tape: Useful for measuring the length of the bar and ensuring compatibility with chains.
Bar Cleaning Brush: A bar cleaning brush typically features stiff bristles that can efficiently dislodge and remove sawdust, dirt, and other particles that accumulate in the bar’s groove. Keeping the groove clean is vital as it allows the chain to move freely, reducing wear and preventing potential damage to both the chain and the bar.
Bar Oil Applicator: This tool is designed to dispense bar oil directly onto the bar and chain, ensuring they remain lubricated during operation. Proper lubrication minimizes friction, which can lead to overheating and premature wear of the chainsaw bar, making this tool crucial for maintaining performance and efficiency.
Depth Gauge Tool: The depth gauge tool is used to check the height of the depth gauges on the chain, ensuring they are set to the correct level for optimal cutting. If the depth gauges are too high or too low, they can affect the cutting efficiency and increase the likelihood of kickback, making this tool essential for safe operation.
File Guide: A file guide helps users sharpen the chainsaw chain accurately and uniformly, which is essential for maintaining cutting performance. By ensuring that each tooth is sharpened to the same angle and length, this tool helps achieve smoother cuts and reduces the risk of damage to the bar and chain.
Ruler or Measuring Tape: A ruler or measuring tape is necessary for confirming the length of the chainsaw bar, which is important when purchasing replacement chains or bars. Ensuring the correct length helps prevent compatibility issues and ensures that the chainsaw operates efficiently.
What Are the Top Tools Recommended for Cleaning Chainsaw Bars?
The best tools for maintaining chainsaw bars ensure optimal performance and longevity of the chainsaw.
- Bar Rail File: This tool is specifically designed to maintain the shape and sharpness of the bar rails, which affects the chain’s ability to run smoothly. By regularly filing the rails, you help prevent wear and tear, ensuring that the chain sits correctly and reduces the risk of damage.
- Chainsaw Bar Cleaning Brush: A cleaning brush is essential for removing debris and sawdust that accumulates in the bar groove. This prevents clogging and allows for better lubrication of the chain, ensuring the chainsaw operates efficiently without overheating.
- Bar and Chain Oil: Regular application of bar and chain oil is crucial for reducing friction between the chain and the bar. This type of oil is specially formulated to adhere to the bar and chain, providing necessary lubrication and extending the life of these components.
- Chainsaw Tool Kit: A complete tool kit usually includes a combination of wrenches, screwdrivers, and other tools necessary for adjusting and repairing the chainsaw bar and chain. Having a dedicated kit allows for quick adjustments and maintenance, ensuring the chainsaw remains in top condition.
- Depth Gauge Tool: This tool is used to check and adjust the depth gauges on the chain, ensuring that the cutters are set to the correct height. Properly adjusted depth gauges enhance cutting efficiency and prevent excessive wear on both the chain and the bar.
What Tools Are Best for Repairing Chainsaw Bars?
The best tools for maintaining and repairing chainsaw bars include a variety of specialized equipment designed to ensure optimal performance and longevity.
- Bar Rail File: This tool is essential for maintaining the grooves on the chainsaw bar, known as the rails. By filing the rails, you can keep them smooth and prevent the chain from binding, which can lead to uneven wear and decreased cutting efficiency.
- Chainsaw Bar Straightening Tool: This tool is used to straighten bent chainsaw bars, which can occur from heavy use or improper handling. It helps restore the bar to its original shape, ensuring proper chain alignment and reducing the risk of further damage during operation.
- Bar Cleaning Brush: Regular cleaning of the chainsaw bar is crucial for preventing the buildup of sawdust and oil residue. A dedicated cleaning brush helps remove debris from the bar’s surface and the oil holes, promoting better lubrication and performance.
- Chainsaw Bar Ruler: This tool allows you to measure the depth of the groove on the chainsaw bar accurately. Ensuring the groove is within the correct specifications is vital for chain fit and functionality, helping to prevent premature wear and potential accidents.
- Screwdriver Set: A good set of screwdrivers is necessary for tightening or replacing bolts and screws on the chainsaw bar. Regular maintenance may require adjustments, and having the right screwdriver ensures you can easily perform these tasks without causing damage.
Why Is Regular Chainsaw Bar Maintenance Important?
Regular chainsaw bar maintenance is important because it ensures optimal performance, safety, and longevity of the chainsaw. Neglecting this maintenance can lead to increased wear, reduced cutting efficiency, and potential safety hazards.
According to the American National Standards Institute (ANSI), maintaining a chainsaw bar can significantly extend its lifespan and improve cutting performance (ANSI B175.1). Proper care includes cleaning, lubrication, and checking for wear, which are critical to preventing issues such as chain derailment or bar damage.
The underlying mechanism involves the interaction between the chainsaw bar and the chain. When the bar is not adequately maintained, it can become uneven or develop grooves, which can lead to improper chain alignment. This misalignment can cause excessive friction, increasing wear on both the chain and the bar, and ultimately shortening their useful life. Additionally, insufficient lubrication results in overheating, which can warp the bar and create dangerous operating conditions.
Furthermore, regular maintenance helps in identifying minor issues before they escalate into major problems. For example, inspecting the bar for cracks or damage can prevent catastrophic failures during operation. The best chainsaw bar maintenance tools are designed to facilitate these checks and ensure that the bar remains in peak condition, allowing for safe and efficient use of the chainsaw.
How Does Regular Maintenance Affect the Performance of Your Chainsaw?
Regular maintenance significantly enhances the performance and longevity of your chainsaw.
- Cleaning the Chainsaw Bar: Keeping the chainsaw bar clean is crucial for optimal performance. Accumulation of debris and sawdust can lead to overheating and increased friction, reducing the efficiency of the chainsaw and leading to potential damage.
- Sharpening the Chain: A sharp chain is essential for effective cutting. Dull chains require more force, which can strain the engine and reduce cutting speed, ultimately leading to premature wear and tear on both the chain and the bar.
- Lubrication: Proper lubrication of the chain and bar is vital for smooth operation. Insufficient lubrication can cause excessive wear, overheating, and even chain breakage, negatively impacting the chainsaw’s performance.
- Tension Adjustment: Ensuring the chain is correctly tensioned affects cutting performance and safety. A chain that is too loose can derail, while one that is too tight can cause excessive wear on the bar and drive sprocket.
- Inspection of Components: Regularly checking the chainsaw’s components for wear and damage can prevent bigger issues. Identifying problems early, such as a cracked bar or damaged chain links, can save you from costly repairs and ensure safe operation.
- Air Filter Maintenance: A clean air filter ensures that the engine receives the proper air-fuel mixture for optimal combustion. Clogged filters reduce engine efficiency and can lead to performance issues, increased fuel consumption, and potential engine damage.
- Fuel Quality: Using high-quality fuel can significantly affect chainsaw performance. Poor-quality or stale fuel can lead to engine knocking, reduced power, and increased emissions, ultimately compromising the durability of the chainsaw.
What Mistakes Should You Avoid When Using Chainsaw Bar Maintenance Tools?
When using chainsaw bar maintenance tools, there are several common mistakes to avoid to ensure effective maintenance and safety.
- Neglecting Regular Cleaning: Failing to regularly clean the chainsaw bar can lead to debris buildup, which affects the performance and longevity of the tool. Dirt and sawdust can cause excessive wear on the bar and chain, leading to costly repairs or replacements.
- Using Incorrect Tools: Utilizing the wrong maintenance tools for your chainsaw bar can result in ineffective maintenance and potential damage. Always ensure that you are using tools specifically designed for the type and model of your chainsaw to avoid mishaps.
- Over-tightening the Chain: Over-tightening the chain during maintenance can lead to unnecessary strain on the bar and chain, causing premature wear or even breakage. It’s important to adjust the chain tension correctly, allowing for slight movement while ensuring it remains secure.
- Ignoring Bar and Chain Alignment: Failing to check the alignment of the bar and chain can lead to uneven wear and poor cutting performance. Regularly inspect the alignment to ensure that the bar is straight and the chain runs smoothly along its path.
- Neglecting Lubrication: Forgetting to lubricate the chainsaw bar can result in increased friction, overheating, and ultimately damage to the chain and bar. Always ensure that the lubrication system is functioning properly and that the bar is adequately lubricated before use.
- Not Inspecting for Wear and Damage: Skipping regular inspections for wear and damage can lead to using a compromised tool, which may fail during operation. Check for cracks, bends, or wear on the bar and chain regularly to maintain safety and efficiency.
- Using Dull Chains: Operating with dull chains can strain the engine and bar, reducing overall performance. Ensure that the chainsaw chain is sharpened regularly to maintain cutting efficiency and prolong the life of the bar.