Machining Ponderosa Pine and Douglas-Fir . . . Effect of Growth Rate and Density

Slow-grown ponderosa pine and Douglas-fir with a greater number of rings per inch showed smoother cuts in turning, boring, and mortising tests. Samples were also planed and shaped, and all samples were graded after machining for smoothness of cut. The specific gravity of the samples also had a significant effect on the machining results, but less so than the number of rings per inch.

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