A log grader (scaler) looks at logs and decides two things: how much usable wood is in them and what grade they are, which sets what the seller gets paid and the mill pays. The work is hands-on: you measure, jab and inspect logs, apply written grading rules, and record the results accurately. Most people enter with a high school diploma and learn on the job from an experienced scaler, so your plan is to learn the vocabulary (species, defects, log rules), practice the math, and train your eye on real logs. Be honest and careful, because both buyers and sellers rely on your numbers. There is no
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Stage 1 of 3 · about 8 weeks
Understand trees, logs, and the basic measurements so you can describe any log correctly and calculate its volume by hand.
Tree and log species identification
Species drives value and grade rules. A clear spruce log and a clear hemlock log may be priced and graded differently, so you must name what you are looking at.
Log defects and what they mean
Defects reduce usable lumber and so reduce grade. Knowing a sound knot from a rotten one, or sweep from crook, is the heart of the job.
Measuring logs: length, diameter, trim
Every volume number starts with a measurement. A one-inch error in diameter can change board feet noticeably, and buyers will notice.
Log rules and volume math
Doyle, Scribner and International 1/4-inch are rules that turn diameter and length into board feet. Mills in different regions use different rules, and they give different answers for the same log.
Then 2 more stages (about 36 weeks in all) with lessons, drills, projects, 6 interview questions with strong answers and free resources.