Figuring Rough Stock for Moulding Manufacture
From contributor B:
You need to know the face width of a blank. We'd use 4.75" for a 4-1/4" face.
(4.75 x 12 x total lineal feet)/ 144 = Net Board Feet. Add your waste factor anywhere from 1.5 to 2 to get the amount of raw RWL needed.
Net Board Feet (from above) x waste factor = Required Board Feet
From Gene Wengert, technical advisor Sawing and Drying forum:
Because of the poor yield from certain widths, you might also want to consider ordering specific widths of lumber. Let your supplier rip the lumber, in other words.
From contributor D:
I take the finished width,
+ 1/8" for machining
+ 3/16" for saw kerf
+ 15% rip to width waste
Divide by 12 (to get the Board Feet / Lineal Feet)
Multiply by the Lineal Feet x 15% SLR waste x misc waste depending on grade(8% for Select & better)
This would give the board feet of lumber used, but you will need to buy two or three times that amount to sort for correct widths. I would figure 240 board feet for 450' of 4 1/4" moulding using the above formula, and order 500-750 board feet. The extra will go towards the next project, unless it's also 4-1/4".
From the original questioner:
Thanks for the tips on this subject. I really have a grasp now on this figuring out all of the different conversions to go from one to the next.
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