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The
DO NOT apply oil or other lubricants to the
Figure 18. Anti-kickback fingers.
The species of wood, as well as its condition, have a dramatic effect on planing ability. The harder the wood (as illustrated by its shear strength), the more difficult it will be to plane. A brief listing of common hard and soft woods in relation to their shear strengths and planing diffi- culty is listed below.
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| Type | Shear (PSI) |
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| Black Locust |
| 2,480 |
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| Sugar Maple |
| 2,330 |
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| Pecan Hickory | 2,080 |
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| Increasing | Difficulty |
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| American Elm | 1,510 |
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| White Oak |
| 2,000 |
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| White Ash |
| 1,950 |
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| Black Cherry |
| 1,700 |
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| Black Walnut |
| 1,370 |
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| Red Alder |
| 1,080 |
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| Basswood |
| 980 |
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| Cottonwood |
| 930 |
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| Type | Shear (PSI) | ||||
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| Western Larch | 1,410 |
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| Tamarack |
| 1,280 |
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| Douglas Fir |
| 1,160 |
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| Alaska Cedar |
| 1,130 |
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| Sitka Spruce |
| 1,150 |
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| Sugar Pine |
| 1,050 |
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| Cypress |
| 1,000 |
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| Redwood (OG) | 940 |
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| Red Cedar |
| 860 |
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| White Pine |
| 850 |
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| Balsam Fir |
| 710 |
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G0550/G0551 15" Planer |