Term
| What is the disadvantage of the straight line rip saw technique? |
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Definition
| High labor, low yield, low flexibility |
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Term
| What is the disadvantage of the fixed gang rip saw technique |
|
Definition
| Low flexibility, long setup times |
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Term
| Does higher grade lumber or lower grade lumber cost more to process |
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Definition
| Lower grade costs more to process- knots, uneven grain, size etc. |
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Term
| When considering whether to rip first or crosscut first, list factors that affect layout decision |
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Definition
| capital, labor skill, length, width, straightness, defects, number of parts, volume of parts etc |
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Term
| Sawteeth that are like chisels are used for what type of sawing |
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Definition
|
|
Term
| Define or sketch conventional sawing |
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Definition
| operates against direction of stock feed, less HP, poorer finish quality, less vibration. |
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Term
| What is a disadvantage of climb sawing? |
|
Definition
| faster tool wear, more power requirement |
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Term
|
Definition
| 1st step in secondary wood product manufacture |
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Term
| How does lumber quality (as input material) affect yield of finished parts? |
|
Definition
| The higher the lumber quality, the higher the yield (generally) |
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Term
| Define or sketch ways to obtain side clearance on a saw body |
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Definition
|
|
Term
| In sawing how does depth of cut affect horsepower? |
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Definition
| Increase in depth of cut increases power consumption, increased horsepower |
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|
Term
| What is the pitch of a saw |
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Definition
| the distance between teeth, the "bite" |
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Term
| Consider two blades, different sizes with same amount of teeth, how does pitch compare |
|
Definition
| Bigger saw has larger pitch |
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Term
|
Definition
|
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Term
| When vibrating a saw and sprinkling sand on the blade to determine mode shape what is essential to completely evaluate blade |
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Definition
| Measure frequencies and record, and compare to a standard (balanced control blade) |
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Term
|
Definition
| Unwanted sound, usually from work |
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|
Term
| List two sources of vibration |
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Definition
| Mechanical- loose nut cause metal on metal vibration. Aerodynamic- propulsion of air causes sound |
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Term
| List results discussed in class of a saw not having sufficient side clearance |
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Definition
| Burn kerf wall, overheat. Temp or perm loss of balance- catastrophic failure |
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Term
| Define or sketch strobe saw |
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Definition
| carbide blades along body of blade to prevent binding and overheating. Good for knotty/low grade, |
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Term
| optimum degree for rake angle |
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Definition
|
|
Term
| Define peripheral cutting. Give an example |
|
Definition
| Rotary gang. Most common, rotary cutting knives on cutterhead, intermittent contact with material, workpiece passes by or through cutterhead |
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Term
| What does saw tensioning mean to do? |
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Definition
| Intentional use of favorable residual stresses created through plastic deformation by hammering rolling or concentrated heat applicaton. |
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Term
| What is main disadvantages of polycrystalline diamond? |
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Definition
|
|
Term
| What is the advantage of helical moulter or planer head? |
|
Definition
| Less noise, better surface, better tool wear. |
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Term
|
Definition
| precision tooling,quick tool holder change |
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|
Term
| List two of the four tool wear mechanisms |
|
Definition
| Abrasion, oxidation, electrochemical, |
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|
Term
| Define incremental programming on a CNC router. |
|
Definition
| Moving from the last point rather than based on a a total coordinate system |
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|
Term
|
Definition
| Using a program to fit multiple pieces onto a sheet to be cut |
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Term
| What is the purpose of the down shear design of a router bit? |
|
Definition
| Downshear holds down the work piece, less top chipping |
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Term
| Name 2 types of router bits |
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Definition
| downshear, upshear, hogging bit, compression bit |
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Term
| What is the advantage of tungsten carbide tool material over high speed stell |
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Definition
| It is harder although more brittle, more corrosion, chemical resistant |
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Term
| What is the purpose of the first two heads of a moulder |
|
Definition
|
|
Term
| List types of tool holding techniques discussed for routers |
|
Definition
|
|
Term
|
Definition
| Computer Assisted Machining |
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|
Term
| What is the result of an unbalance tool on surface quality |
|
Definition
| Decreases surface quality |
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|
Term
| What is the disadvantage of an open coated abrasive |
|
Definition
| Less material buildup due to less grit |
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|
Term
| What is the single most important characteristics in a wide belt sander that controls the rate of cut and finish? |
|
Definition
|
|
Term
| List the three types of moulder clamping systems |
|
Definition
|
|
Term
| What is the amount of abrasive coverage for open coat abrasive |
|
Definition
|
|
Term
| What are the advantages of a continuous press system |
|
Definition
| Mix chip particles and resins, heat and compress in progress, faster, more uniform product, less cold spot issues |
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|
Term
| What is the most common operator error for a wide belt sander. |
|
Definition
| improperly utilizing the entire width of the feed bed |
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|
Term
| List three of the types of wood composites listed in class |
|
Definition
|
|
Term
| In general what is the overall disadvantage of wood composites as a class of material |
|
Definition
| Lower dimensional stability, heavy |
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|
Term
| What is a caul in the production of particleboard |
|
Definition
|
|
Term
| Characteristics that affect conversion process |
|
Definition
| grade, length, species, width, mc |
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|
Term
| List 3 possible sorts in a log yard |
|
Definition
| grade, length, species, width |
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|
Term
| why are sprinklers used in a log yard |
|
Definition
| to help species susceptible to blue staining, prevent rapid drying/cracking |
|
|
Term
| List disadvantages of using water storage |
|
Definition
| marine borers, sinkers, water pollution |
|
|
Term
| what is the definition of a board foot |
|
Definition
|
|
Term
| list different board foot log rules discussed in class |
|
Definition
| doyle, scribner, international |
|
|
Term
| which board foot log rule is the most accurate |
|
Definition
|
|
Term
| What is the main disadvantage of the newton scaling method |
|
Definition
|
|
Term
| what are tree sections called when they are 8 feet or greater in length |
|
Definition
|
|
Term
| Why is desirable to debark a log before further processing |
|
Definition
| Prolongs life of cutting equipment, reduces debris in sawmill |
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|
Term
| List debarkers discussed in class |
|
Definition
| mechanical ring debarker, drum debarker |
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|
Term
| List 2 disadvantages of mechanical ring debarker |
|
Definition
| rought cut, can pull knots |
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|
Term
| When is a drum debarker typically used |
|
Definition
|
|
Term
| list the 4 types of bucking systems |
|
Definition
| endwise, sidewise, bunch bucking, slashing |
|
|
Term
| what is the primary advantage of the endwise bucking system |
|
Definition
|
|
Term
| what is the definition of a headrig |
|
Definition
| lumber is taken to for primary processing |
|
|
Term
| List some cutting systems for primary breakdown |
|
Definition
| scragg, single band, multiple band, chipper headrig |
|
|
Term
| what is the main advantage of a conventional headrig |
|
Definition
| can turn log or cut for grade |
|
|
Term
| What is advanage of a band mill over a circular headrig |
|
Definition
| saw kerf, size of logs that can be cut |
|
|
Term
| what is the main difference between a pony and a resaw |
|
Definition
|
|
Term
| what is the primary purpose of the edger |
|
Definition
|
|
Term
|
Definition
| reman edgers, band mill edgers |
|
|
Term
| what is a combination edger |
|
Definition
| machine that will handle selectiove on one side and fixed battery on the other side |
|
|
Term
| Define trimming operation |
|
Definition
| practice of crosscutting lumber to square the ends or remove defects to raise the grade |
|
|
Term
|
Definition
| line shaft drop trimmer, multiple drop |
|
|
Term
| what is advantage of line drop shaft trimmer over similar trimmers |
|
Definition
| no motor, less heat buildup |
|
|
Term
| what is the difference between edging and trimming operations |
|
Definition
| edging rips to width. trimming crosscuts to length |
|
|
Term
| list four types of sorts when sorting lumber |
|
Definition
| grade, species, length, width |
|
|
Term
| list methods of sorting lumber |
|
Definition
|
|
Term
| disadvantage of a drop sorter, |
|
Definition
|
|
Term
| disadvantage of chain tray sorter |
|
Definition
|
|
Term
| what is the definition of green chain |
|
Definition
|
|
Term
|
Definition
| crib unstacker, breakdown hoist |
|
|
Term
| what is disadvantage of crib unstacker |
|
Definition
|
|
Term
| what is disadvantage of abrasive planer |
|
Definition
|
|
Term
| what happens if there are too many knives per fee speed? |
|
Definition
| too many knives in a cutterhead at too slow speed can cause hammer marks, dull more quicker and burning can occur |
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|
Term
|
Definition
|
|
Term
| Grading of dimension lumber is based on.... |
|
Definition
|
|
Term
| Define what is meant by a "board" |
|
Definition
| less than 2" thick- 1" or more in width |
|
|
Term
| how does feed speed affect chip size |
|
Definition
| Faster feed speed, thicker the chip |
|
|
Term
| advantage of breakdown hoist |
|
Definition
|
|
Term
| disadvantage of breakdown hoist |
|
Definition
| requires fork truck and driver |
|
|
Term
|
Definition
| 1 blade for every 50 feet of feed speed required |
|
|
Term
|
Definition
| small chips, raised grain, damages knives |
|
|
Term
|
Definition
| make large shavings, poor surface |
|
|
Term
| how does feed speed affect chip size |
|
Definition
| Faster feed speed, thicker the chip |
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