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Agricultural Mechanics Fundamentals & Applications

Agricultural Mechanics Fundamentals & Applications. UNIT 19—Figuring a Bill of Materials (BOM). Bill of Materials. Define as a list and description of all the materials to be used in constructing a project. Components. Bill of materials should include: Item or part name Number of pieces

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Agricultural Mechanics Fundamentals & Applications

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  1. Agricultural MechanicsFundamentals & Applications UNIT 19—Figuring a Bill of Materials (BOM)

  2. Bill of Materials • Define as a list and description of all the materials to be used in constructing a project.

  3. Components • Bill of materials should include: • Item or part name • Number of pieces • Type of material • Size of pieces • Description of parts • Total feet • Unit cost • Cost

  4. Tips • Calculate: - number of pieces - total footage - type of wood, etc. - individual prices - total cost • Be sure to calculate lumber for the length that is to be purchased—not just the length to be used for the project.

  5. Calculating Board Feet • For small lumber: BF = Thickness (in)  Width (in)  Length (in) 144 Or: BF = T''  W''  L'' 144 • For large lumber: BF = T''  W''  L' 12

  6. Pricing • Rough Lumber from sawmill is sold by per thousand board feet. • Wood products that are sold in sheets are sold by the panel or by the square foot. • Retail stores sell lumber by linear measurements.

  7. Standard Abbreviations “ or in = inch lb = pound ‘ or ft = foot d = penny(nails) yd = yard NC= Nat’l coarse mi = mile NF=Nat’l fine ea = each NPT=Nat’l pipe @ = at N/A = not applicable pt = pint

  8. Standard Abbreviations LF = linear foot BF = board foot S1S = surface 1 side S2S = surface 2 sides S3S = surface 3 sides S4S = surface 4 sides No. /# = number in² = square inch ft² = square foot yd² = square yard

  9. Standard Abbreviations Square = 10’ X 10’ or 100 square feet NC = national coarse threads NF = national fine threads NPT = national pipe threads d = penny (nails) lb = pounds Cwt = hundredweight (100 lbs)

  10. Lumber • Available in 6’, 8’, 10’, 12’, 14’, 16’, • Special orders for 18’ & 20’ • Widths • 1x6 2x4 • 1x8 2x6 • 1x10 2x8 • 1x12 2x10 2x12 4x6

  11. Plywood • Interior and Exterior grades • Available in 4’ x 8’ sheet • Thickness – ¼”, 3/8”, ½”, 5/8”, ¾” 1”

  12. Structural Steel • Standard Length – 20feet • Flat iron – thickness – 1/8,3/16,1/4,5/16,3/8,1/2 • Width – ½, ¾,, 1, 1-1/2, 2, 3, 4, 5 inch • Angle iron – thickness – same as flat iron • Width – 1/2x1/2; 3/4x3/4; 1x1; 1-1/2x1-1/2; 2x2; extends to 4x4 • Round –Hot Rolled, Cold Rolled or Tool Steel • Size in diameter = ¼, 5/16,3/8,3/4,1 to 3”

  13. Steel Pipe • Standard length = 21 feet • Black & galvanized • Lengths • ¼, 3/8, ½, ¾, 1 up to 3 inches

  14. Important Terms • Item—a separate object. • Rounded Up—when rounding numbers, round to the next highest number. • Tongue and Groove Lumber—lumber with a tonguelike edge sticking out on one side and a groove cut into the other.

  15. Terms Cont. • Galvanize—coat a metal with zinc. • Cadmium—used for rust-resistant plating of steel products. • Board Foot—an amount of wood equal to a board 1'' thick, 1' wide, and 1' long.

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