Term
| Definition of a board foot |
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Definition
| 144 cubic inches of wood. 1x12x12 |
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Term
| 3 different board foot log rules |
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Definition
| Scribner, doyle, International |
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Term
| Main advantage of Newton scaling method |
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Definition
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Term
| What is main disadvantage of Newton |
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Definition
| Slow-need to measure in 3 places |
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Term
| Name of tree sections when they are 8' or less |
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Definition
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Term
| Name of tree sections when they are 8' or more |
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Definition
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Term
| What is the problem with the doyle log rule? |
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Definition
| Inaccurate and inconsistent net results |
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Term
| Why is it desirable to debark logs before further processing |
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Definition
| Prolong life of cutting tools, reduce debris in the mill, enable sawyer to see and evaluate the low for breakdown |
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Term
| When is a drum debarker typically used? |
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Definition
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Term
| Disadvantage of drum debarker |
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Definition
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Term
| Disadvantage of mechanical ring debarker |
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Definition
| Will remove wood as easily as bark, high operating and maintenance cost, stringy bark will wrap around |
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Term
| List the 4 types of bucking systems |
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Definition
| endwise, sidewise, bunch bucking, slashing |
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Term
| List the 4 types of bucking saws |
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Definition
| chain saws, stationary slashing saws, guillotine saws, swing saws |
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Term
| Definition of green chain |
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Definition
|
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Term
| Four methods of sorting lumber |
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Definition
| green chain, drop sorter, edge sorter, chain tray |
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Term
| list 4 types of sorts that may be used when sorting lumber |
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Definition
| grade, species, length, width, MC%, thickness |
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Term
| Main difference between a pony and a resaw |
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Definition
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Term
| What is the advantage of a band mill over a circular headrig |
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Definition
| saw kerf, size of logs that can be cut. |
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Term
| Why are sprinklers used in a log yard |
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Definition
| Species subject to blue staining, rapid drying or cracking |
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Term
| Advantages of using water for storage of logs |
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Definition
| keeps from drying out, easy to move around, protected from freezing, cleans logs of dirt and sand |
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Term
| 2 disadvantages of water storage |
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Definition
| loss of sinkers, marine borers can be a problem, salt water will corrode mill equipment, water pollution |
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Term
| Primary advantage of the endwise bucking system |
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Definition
| Maximum recovery, easily adapted to autobucking, good for softwood or hardwood mills |
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Term
| Disadvantages of endwise bucking system |
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Definition
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Term
| Name some of the cutting systems for primary breakdown |
|
Definition
| single band mill, multiple band mill, chipper headrig, scragg mill, single circle saw headrig, double circle saw headrig |
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Term
| List some of the transport chains discussed in class |
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Definition
| Ducking chain, sharp chain, alligator chain, buckhorn chain |
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Term
| Main advantage of a conventional carriage |
|
Definition
| Can turn the log or cut for grade |
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Term
| Disadvantage of conventional carriage |
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Definition
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Term
| Advantage of a circular saw headrig over a band mill |
|
Definition
| lower capital and maintenance costs, saw costs are lower, needs less overhead space |
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Term
| Primary advantage of a chipper headrig |
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Definition
| Increase in production, less saw lines to cut, conversion of saw kerf into chips, chips are 3-5 times more valuable |
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Term
| Disadvantage of chipper headrig |
|
Definition
| Rough cut, pulls out knots |
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Term
| Main Advantage of curve sawing |
|
Definition
| Straighter grain, longer lumber |
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Term
| Disadvantage of curve sawing |
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Definition
|
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Term
| Two types of curve sawing discussed in class |
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Definition
|
|
Term
| What are the purpose of ponies and resaws |
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Definition
| Secondary conventional carriage. (resaw used to further breakdown cant into smaller sizes for further manufacture) |
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Term
| Define trimming operation |
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Definition
| Practice of cross cutting lumber to square the ends, cutting to length, crosscut operation |
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Term
|
Definition
|
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Term
|
Definition
| Saw on each side of conveyor, push or pull to square the ends |
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Term
| Types of multiple drop trimmer |
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Definition
| Electric line shaft and each saw has own motor |
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Term
| What is a selective edger |
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Definition
| edger that can cut variable widths |
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Term
| What is the primary purpose of the edger |
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Definition
| Wavy edges removed, wide widths are reduced to narrower widths, grade is raised by removing gross defects or isolating them for removal |
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Term
| Difference between edging and trimming operations |
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Definition
| Edge is ripping to width, trimming is crosscutting to length |
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Term
| What is the advantage of the line shaft drop trimmer over similar trimmers |
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Definition
| No motor, less heat build up, saws can be closer together |
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Term
| Disadvantage of a drop sorter |
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Definition
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|
Term
|
Definition
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|
Term
| Disadvantage of chain tray |
|
Definition
|
|
Term
|
Definition
| bar type, lug type, drum type, board dealers |
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|
Term
| breakdown hoist advantage |
|
Definition
| lower capital cost, greater surge area capacity |
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Term
| Disadvantage of breakdown hoist |
|
Definition
| requires fork truck and driver |
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