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Introduction to wood


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An introduction to lumber and sheetgoods for our Studio H students.

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Introduction to wood

  1. 8. <ul><ul><ul><li>LUMBER: </li></ul></ul></ul><ul><ul><ul><li>2 types of wood: softwood (coniferous) and hardwood (deciduous) </li></ul></ul></ul><ul><ul><ul><li>drying occurs via air or kiln </li></ul></ul></ul><ul><ul><ul><ul><li>-wood is considered dry at or below 19% moisture content </li></ul></ul></ul></ul><ul><ul><ul><li>nominal vs. actual dimensions </li></ul></ul></ul><ul><ul><ul><li>2” increments 2,4,6,8,10,12 </li></ul></ul></ul><ul><ul><ul><li>Nominal 2x4 is actually 1.5”x3.5” </li></ul></ul></ul><ul><ul><ul><li>2 is 1.5” </li></ul></ul></ul><ul><ul><ul><li>4 is 3.5” </li></ul></ul></ul><ul><ul><ul><li>6 is 5.5” </li></ul></ul></ul><ul><ul><ul><li>8 is 7.25” </li></ul></ul></ul><ul><ul><ul><li>10 is 9.25” </li></ul></ul></ul><ul><ul><ul><li>12 is 11.25” </li></ul></ul></ul><ul><ul><ul><li>Lengths range from 8’ to 20’ in 2’ increments </li></ul></ul></ul>
  2. 26. <ul><ul><ul><li>SHEETGOODS: </li></ul></ul></ul><ul><ul><ul><li>the term sheetgoods is generic for any panelized product made of a wood fiber aggregate and adhesive </li></ul></ul></ul><ul><ul><ul><ul><li>- these include: plywood, MDF (medium density fiberboard), OSB (oriented strand board), particle board, homosote, masonite, etc. </li></ul></ul></ul></ul><ul><ul><ul><li>basic characteristics: </li></ul></ul></ul><ul><ul><ul><ul><ul><li>- dimensionally stable and consistent in thickness </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>- easy to machine </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>- grain is either variable or non-existent </li></ul></ul></ul></ul></ul><ul><ul><ul><li>nominal vs. actual: </li></ul></ul></ul><ul><ul><ul><ul><ul><li>- thickness is called out and sold in nominal terms while the actual dimension may vary </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>- typically a 3/4 ” thick sheet of plywood will actually be 23/32 ” or 11/16 ” thick </li></ul></ul></ul></ul></ul><ul><ul><ul><li>plywood: </li></ul></ul></ul><ul><ul><ul><ul><ul><li>- always laminated with an odd number of plies with one exception - bending plywood </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>- grain of overlapping plies run in alternating directions to provide diaphragmatic strength </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>- surface quality is rated in letter grades A,B,C,D - ‘A’ being the best </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><li>- a grade BC means one face will appear much cleaner and clearer than the other </li></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>- typically, more plies = better quality = more $ </li></ul></ul></ul></ul></ul>
  3. 28. Importance of Building/Studio H
  4. 29. Importance of Building/Studio H