Measuring tree logs is a crucial step in the timber industry, primarily to determine their length and estimate potential lumber yield. While volume scaling often involves measuring both diameter and length using specialized tools like a log scale stick based on rules like the Doyle Rule, the fundamental first step is accurately determining the log's usable length according to industry standards.
Measuring Log Length
The process of measuring log length typically involves using a measuring tape or a specially marked Log Scale Stick. These tools help in determining the total length while adhering to specific protocols for rounding and accounting for necessary trim.
Here are the key steps based on standard practices, including the details referenced from the Log Scale Stick (Doyle Rule) information:
- Obtain a Measuring Tool: Use a reliable measuring tape or a log scale stick designed for length measurement.
- Measure the Total Length: Measure the log from end to end.
- Account for Trim Allowance: It is essential to include extra length beyond the desired lumber length to allow for trimming square ends at the sawmill. A minimum of 6 to 8 inches must be provided for this purpose.
- Determine the Standard Log Length: Logs are typically processed and sold in standard, even-numbered lengths, measured in 2-foot intervals (e.g., 8, 10, 12, 14, 16 feet, etc.).
- Round Down to the Nearest Interval: The measured log length, including the necessary trim allowance, determines the standard length it qualifies for. If a log measures slightly over a standard length but less than the next, it is rounded down to the lower standard length, provided it still has the required trim allowance for that lower length.
Practical Example
The reference states: "a log that measures 16'6” would be labeled a 16-foot log."
This illustrates the principle:
- The target standard length is 16 feet.
- The log's actual measured length is 16 feet and 6 inches.
- The 6 inches provides the necessary trim allowance.
- Since it meets the length requirement for a 16-foot log plus the required trim, it is recorded as a 16-foot log.
Conversely, a log measuring exactly 16'0" might not be labeled a 16-foot log if the 6-8 inches of trim allowance must be provided beyond the standard length. In that case, it would likely be measured as a 14-foot log, assuming it has enough length (at least 14'6" to 14'8") to qualify for the 14-foot interval with its trim allowance.
Here's a simple representation based on the example:
| Measured Length (Actual) | Trim Provided (based on 6-8" rule) | Standard Log Length (2-ft intervals) | Recorded Log Length |
|---|---|---|---|
| 16' 6" | 6" | 8, 10, 12, 14, 16, 18 ft... | 16' |
| 14' 8" | 8" | 8, 10, 12, 14, 16 ft... | 14' |
| 15' 11" | Less than 6" trim for 16' | 8, 10, 12, 14, 16 ft... | 14' |
Note: The exact minimum trim requirement can vary slightly by region or mill, but 6-8 inches is a common standard.
Accurate measurement ensures fair trade and efficient processing at the sawmill, minimizing waste and maximizing yield from the timber resource.
