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Circular Saw

Circular Saw. Not used as headrig in softwood sawmills Less throughput than band saw Blades rigid, saw kerf is 1/4” to 3/8” Relatively wide saw kerf – high waste factor. Circular saw. Circular saw video. Waste Factor Comparison. Band Saw. Circular saw. Sawmill – generic overview.

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Circular Saw

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  1. Circular Saw • Not used as headrig in softwood sawmills • Less throughput than band saw • Blades rigid, saw kerf is 1/4” to 3/8” • Relatively wide saw kerf – high waste factor

  2. Circular saw

  3. Circular saw video

  4. Waste Factor Comparison Band Saw Circular saw

  5. Sawmill – generic overview Log yard Bucking Debarker Headrig Cants Side boards Gang Saw Trimmer Edger Sorter, Stacker

  6. Gang Sawing cant gang saw blades

  7. Gang saws • Fixed, oscillating blades • Little flexibility • Intermediate kerf • Single pass • High throughput

  8. Gang saws

  9. Log breakdown patterns 1. live sawing 2. cant sawing 3. sawing for grade 4 & 5. sawing for edge grain 6. dimension lumber

  10. Optimization software

  11. Scanning of the log to optimize the yield Bottom profile Mid-length profile 1x4 14 #2 Top profile 2x4 16 #2 2x4 16 #2 Product mix selected 2x4 16 #2 2x4 16 #2 2x4 16 #2 1x4 16 #2

  12. Sawmill optimization (Halco Software Systems)

  13. Sawmill – generic overview Log yard Bucking Debarker Headrig Cants Side boards Gang Saw Trimmer Edger Sorter, Stacker

  14. Wane http://www.wdscapps.caf.wvu.edu/lumberrtk/ http://www.decks.com/article197.aspx

  15. 6. Edger • The edger will rip the rough sawn board to width and remove the wane and other defects. Uses circular saws. wane wane saw cuts

  16. Edger optimizer

  17. 7. Lumber Grading - Trimming

  18. Lumber Grading • Different grades systems for hardwoods and softwoods • Different grades depend mainly on • natural defects • size, number and location of knots • size, location and type of stain or rot • amount of wane • machine defects • skip • snipe

  19. Lumber Grading

  20. Trimming • The trim saw is used to cut the boards to length Lumber is trimmed to lengths of 2 foot multiples. Uses circular saws.

  21. Trimming

  22. Multi-saw trimmer

  23. Sawmill – generic overview Log yard Bucking Debarker Headrig Cants Side boards Gang Saw Trimmer Edger Sorter, Stacker

  24. The “Green Chain”

  25. Descrambler

  26. J-bar sorting • The lumber is scanned and sorted into bins depending on • species, grade, dimensions

  27. Multiple sort bins

  28. Stacking

  29. Drying kilns

  30. Reasons for drying lumber • Increase strength of lumber • Reduces later dimensional changes • Increases decay/insect resistance • Decreases weight of lumber

  31. Drying Sticker Lumber • Drying factors • Temperature • Relative humidity • Air circulation

  32. Planermill Planermill Kilns Sawmill Logyard

  33. Planer

  34. Planer

  35. Planer 24 knifes per planer head 4 knifes per planer head

  36. Waste Management • Trim ends • Chips • Sawdust • Planer shavings • Bark • Hog fuel

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