Determining the bar length of your chainsaw is crucial for ensuring optimal performance and safety. The length of the bar, which holds the cutting chain, directly influences the size and type of trees you can cut. Understanding how to measure bar length is essential for selecting the right replacement bar or purchasing a chainsaw that meets your specific needs. This comprehensive guide will provide you with step-by-step instructions on how to accurately measure the bar length of your chainsaw, empowering you to make informed decisions.
To begin, position your chainsaw on a flat, stable surface. Ensure that the chain is properly tensioned and the bar is free of debris. Next, locate the two ends of the bar. The front end, or the nose of the bar, typically features a sprocket or drive link, while the rear end is where the bar connects to the chainsaw body. Using a measuring tape or a ruler, extend it from the front end to the rear end of the bar, following the contour of the bar. The measurement you obtain represents the tip-to-tip length of the bar, which is the standard industry measurement for chainsaw bar length.
In addition to the tip-to-tip measurement, some manufacturers also provide the cutting length of the bar. The cutting length is typically slightly shorter than the tip-to-tip length and indicates the effective cutting area of the bar. To determine the cutting length, simply deduct the length of the drive link from the tip-to-tip measurement. For example, if the tip-to-tip length is 20 inches and the drive link is 2 inches long, the cutting length of the bar would be 18 inches. Understanding both the tip-to-tip length and the cutting length will help you choose the right replacement bar or chainsaw for your specific cutting requirements.
Determining the Length of a Chainsaw Bar
Accurately measuring the length of a chainsaw bar is crucial for selecting the appropriate replacement blade and ensuring optimal cutting performance. This guide will provide step-by-step instructions on how to determine the length of your chainsaw bar.
To initiate the measurement process, position the chainsaw on a flat surface with the bar flat against it. Identify either end of the bar, ensuring that it is free of any obstruction.
Using a measuring tape, extend it from one end of the bar to the other, keeping it parallel to the bar’s edge. Ensure that the tape measure remains straight throughout the length of the bar, making contact with both ends.
Record the measurement displayed on the tape measure. This value represents the length of the chainsaw bar in inches. It is recommended to take multiple measurements to ensure accuracy and avoid any discrepancies.
Additional Tips
- For more precise results, use a metal ruler or a caliper instead of a measuring tape.
- Inspect the ends of the bar to ensure they are not bent or distorted, as this can affect the accuracy of the measurement.
- If the bar is obstructed or damaged, it may be necessary to contact a professional for assistance with the measurement.
Blade Size Chart
The following table provides a convenient reference for determining the appropriate blade size based on the chainsaw bar length:
| Chainsaw Bar Length (inches) | Blade Size (inches) |
|---|---|
| 12-14 | 10-12 |
| 15-17 | 12-14 |
| 18-20 | 14-16 |
| 21-24 | 16-18 |
| 25-28 | 18-20 |
Measurement Tools and Techniques
Measuring the bar length of a chainsaw is a crucial step for ensuring its optimal performance and safety. The most accurate way to determine the bar length is by using a tape measure or caliper.
Measurement Tools and Techniques
Tape Measure
This is the most common and accessible tool used to measure bar length. Wrap the tape around the bar, starting from the base of the chain to the tip of the nose. The length indicated on the tape at the overlap point represents the bar length.
Caliper
For greater precision, you can use a caliper. Spread the caliper jaws to the width of the bar at the widest point. The measurement on the caliper dial corresponds to the bar length.
| Tool | Accuracy | Ease of Use |
|---|---|---|
| Tape Measure | Good | Easy |
| Caliper | Excellent | Moderate |
Using a Tape Measure
A tape measure is another convenient tool for measuring chainsaw bar length. Here are the steps to use it:
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Position the chainsaw on a flat surface
Place the chainsaw on a stable surface where it will not move during the measurement.
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Extend the tape measure from the tip of the blade
Extend the tape measure from the very tip of the blade where it meets the chain.
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Mark the distance to the base of the bar
Hold the tape measure taut and align it along the length of the bar. Mark or note the measurement at the point where the tape measure reaches the base of the bar, near the handle.
Measurement Bar Length From the tip of the blade to the base of the bar Bar length -
Read the measurement
Once you have marked the distance, read the measurement on the tape measure. This measurement represents the length of the chainsaw bar.
Employing a Caliper Gauge
A caliper gauge is a versatile instrument designed specifically for measuring bar lengths. It features a sliding scale with two adjustable jaws that can be positioned to precisely measure the distance between two points. To ensure accurate measuring using a caliper gauge:
1. Identify the Caliper’s Zero Point
Locate the zero point on the caliper gauge’s scale. This is typically marked with a small notch or line on the stationary jaw.
2. Place the Jaws on the Bar
Position the jaws of the caliper gauge at the two ends of the chainsaw bar. Ensure that the jaws are perpendicular to the bar and that they make contact with the bar’s outermost edges.
3. Slide the Jaws to Measure
Gently slide the movable jaw along the scale until it touches the opposite end of the bar. Ensure that the jaws remain perpendicular to the bar throughout the measurement.
4. Read the Measurement
The distance between the jaws on the caliper gauge’s scale represents the length of the chainsaw bar. Read this measurement carefully, ensuring accuracy.
| Measuring Using a Caliper Gauge |
|---|
|
Utilizing a Ruler or Yardstick
Using a ruler or a yardstick, measure the length of your chainsaw bar from the tip of its guide bar to where the bar connects to the powerhead.
Hold the ruler or the yardstick straight and perpendicular to the bar, aligning it with the edge of the guide bar.
Mark the measurement on the ruler or the yardstick. Ensure that the measurement is accurate by double-checking it.
For longer bars, align the ruler or yardstick with the bar’s edge, ensuring it’s parallel to the bar’s length. Slide the ruler or yardstick along the bar’s length, adding measurements until you reach the end of the bar.
Alternatively, place the bar on a flat surface and align the zero mark of the ruler or yardstick with the bar’s tip. Read the measurement where the bar ends, providing you with the bar’s length.
| Method | Steps |
|---|---|
| Ruler or Yardstick |
|
Measuring from the Bar Nose to the Powerhead
Another accurate method for measuring a chainsaw bar length starts by holding the saw’s handle while the cutting bar faces forward and off to one side. Then, using a measuring tape, reach the tip of the bar with the hook or end of the tape, making sure it aligns with the powerhead as accurately as possible. Finally, read the tape measure at the point where it meets the powerhead to determine the chainsaw bar length.
How to Align the Tape and Powerhead
To achieve the most accurate measurement with this method, proper alignment of the measuring tape and powerhead is crucial. The following steps provide a detailed explanation:
- Hold the end of the tape measure against the tip of the cutting bar for accurate measurement.
- Align the tape measure straight across the cutting bar, ensuring it remains parallel to the bar’s surface.
- Locate the chainsaw’s powerhead, where the engine and drive sprocket are housed.
- Bring the tape measure over the cutting bar and towards the powerhead, making sure it stays aligned.
- Align the tape measure with the outer edge of the chainsaw’s body, where the powerhead casing meets the cutting bar.
- Read the measurement on the tape where it aligns with the powerhead’s outer edge to determine the chainsaw bar length.
| Measurement Method | Accuracy |
|---|---|
| Measuring from the Bar Nose to the Powerhead | Very Accurate |
Compensating for Bar Extensions
When using a bar extension, it’s important to compensate for the added length to ensure optimal performance and safety. Here’s how to do it:
1. Measure the Bar Extension
Measure the length of the bar extension from the end of the original bar to the tip of the extension.
2. Adjust the Chain
Subtract the extension length from the original chain length. This will give you the new chain length needed for the extended bar.
3. Mark the New Chain Length
Mark the new chain length on the original chain using a permanent marker.
4. Remove the Connecting Links
Carefully remove the connecting links from the chain until you reach the mark you made.
5. Reconnect the Chain
Reconnect the remaining chain to the bar extension, ensuring the chain is properly seated in the bar groove.
6. Adjust the Tension
Adjust the chain tension according to the manufacturer’s instructions to ensure optimal performance and safety.
7. Safety Precautions
Always wear appropriate safety gear when operating a chainsaw and follow the manufacturer’s instructions for proper maintenance and use.
8. Bar Extension Length and Chain Length Calculations
To further assist with calculations, here’s a table that outlines the relationship between bar extension length and chain length:
| Bar Extension Length | Chain Length Adjustment |
|---|---|
| 10 inches | -10 inches |
| 12 inches | -12 inches |
| 15 inches | -15 inches |
| 18 inches | -18 inches |
Bar Length Conversions
Chainsaw bar lengths are typically measured in inches, but some models may use centimeters. To convert inches to centimeters, multiply the inches by 2.54. For instance, a 16-inch bar is approximately 40.64 centimeters long.
If the bar length is not marked on the saw, you can measure it yourself using a tape measure or ruler. To do this, place the tape measure at the base of the bar, where it attaches to the saw body, and extend it to the tip of the bar.
Troubleshooting Measurement Challenges
Measuring Odd-Shaped Bars
Some chainsaws have bars with curved or angled tips, which can make it difficult to measure the length accurately. In this case, you can use a string or wire to trace the contour of the bar. Then, lay the string or wire straight and measure its length.
Estimating Bar Length
If you don’t have a tape measure or ruler handy, you can estimate the bar length based on the size of the saw. Most chainsaws have a bar length that is approximately equal to the length of the saw body.
Measuring Bar Length on Electric Chainsaws
Electric chainsaws typically have shorter bar lengths than gas-powered chainsaws. The bar length on electric chainsaws is often 12-16 inches, which is sufficient for most residential cutting tasks.
Measuring Bar Length on Gas-Powered Chainsaws
Gas-powered chainsaws have more powerful motors and can handle longer bar lengths. The bar length on gas-powered chainsaws typically ranges from 16-36 inches, depending on the model and intended use.
Table of Bar Lengths for Common Chainsaw Models
| Chainsaw Model | Bar Length | |
|---|---|---|
| Stihl MS 180 C-BE | 16 inches | |
| Husqvarna 440 e-series | 18 inches | |
| Echo CS-590-20 | 20 inches | |
| Stihl MS 361 | Standard | 20 inches |
| Magnum | 24 inches | |
| Duromatic | 28 inches | |
Ensuring Accurate Bar Length Measurement
1. Wear appropriate safety gear: Always wear safety glasses, gloves, and ear protection when working with power tools.
2. Determine the measurement point: Measure the bar length from the tip of the guide bar to the inside edge of the mounting bolt.
3. Use a measuring tape: Place the measuring tape along the guide bar, aligning the 0-inch mark with the tip of the bar. Extend the tape to the mounting bolt and read the measurement at the inside edge of the bolt.
4. Check for accuracy: Double-check the measurement by measuring it again from the opposite side of the guide bar.
5. Round to the nearest inch: Chainsaw bars are typically measured in whole or half-inch increments. Round the measurement up or down to the nearest inch.
6. Consider offset measurements: Some chainsaws have a “nose bearing” or “sprocket nose” bar that extends beyond the cutting chain. If present, add the length of the offset to the measured length.
7. Check the manufacturer’s specifications: Refer to the chainsaw’s owner’s manual or website for the recommended bar length range.
8. Use a digital caliper (optional): For precise measurements down to thousandths of an inch, consider using a digital caliper. Place the jaws on the tip of the bar and the mounting bolt and read the measurement on the display.
9. Allow for wear and tear: Over time, the guide bar can wear down slightly, reducing its effective length. Factor this into your measurements if necessary.
10. Measure different bar sizes accurately:
| Guide Bar Type | Measurement Point |
|---|---|
| Standard guide bar | Inside edge of the mounting bolt |
| Offset guide bar (nose bearing) | Inside edge of the mounting bolt, plus offset length |
| Carving guide bar | Inside edge of the carving tip |
| Pole saw guide bar | End of the guide bar, excluding the extension pole |
How to Measure a Chainsaw Bar Length
Chainsaw bar length is a crucial factor to consider when selecting the right tool for your cutting needs. It affects the overall efficiency, ease of use, and safety of the chainsaw. Measuring the bar length accurately ensures you choose the most appropriate size for the intended tasks.
To measure the bar length of a chainsaw, follow these steps:
- Position the chainsaw on a flat and stable surface.
- Locate the tip of the guide bar, which is the pointed end.
- Measure the distance from the tip of the guide bar to the point where the chainsaw body starts.
- This measurement represents the bar length of the chainsaw.
Remember, the bar length does not include the length of the chainsaw body or the cutting chain.
People Also Ask
What size chainsaw bar do I need?
The recommended bar length depends on the cutting tasks you intend to perform. For smaller cutting jobs like pruning and limbing, a bar length of 12-16 inches is suitable. For larger tasks like felling trees, a bar length of 18-24 inches or more may be necessary.
How do I know if my chainsaw bar is too long?
An excessively long bar can make the chainsaw difficult to control, increase the risk of kickback, and strain the engine. If you find that the chainsaw is bouncing or vibrating excessively, the bar may be too long for the task.
Can I use a longer chainsaw bar?
While it may be tempting to use a longer bar for more cutting power, it’s not recommended to exceed the manufacturer’s recommended bar length. Using an excessively long bar can put undue stress on the chainsaw components and compromise safety.
