WPS Final Review
Terms
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- What are the two main disadvantages of a chain tray sorter?
- Expensive and requires a large area
- Define kerf
- Width of the cut
- The grading of dimension lumber is based on the ____ side:
- WORST
- What is jointing or what does it do?
- Grinding operation that makes sure all teeth or blades cut equally or run concentric to each other
- Consider two saw blades, one is 10 inch diameter and one is 20 inch diameter. If both have 100 teeth and both are rotating at 3600 rpm, which will have the most teeth striking the surface per minute?
- Will have the same number of teeth per minute
- List four of the eight cutting systems for primary breakdown
- Multiple band mill Single band mill Chipper headrig Scragg mill
- What is a combination edger?
- Machines that will have selective edger on one side and a battery or gang edger on the other side
- Which board foot log rule is the least accurate?
- Doyle
- List two of the four results discussed in class of a saw not having sufficient side clearance
- Rubbing of kerf wall resulting in increased power consumption, burning of kerf wall, loss of temper of teeth, loss of balance
- Does higher grade lumber or lower grade lumber cost more to PROCESS? Why?
- Lower grade since requires more processing steps to remove defects
- List two sources of saw vibration
- Dull teeth, bent teeth, unbalance, bearings, overheated, residual stresses
- What characteristics of the raw material effect the conversion process and possible products produced
- a. Availability, Size, Shape, Defects, Species, Cost
- What is an advantage of climb sawing?
- Provides superior surface finish
- In sawing, how does depth of cut affect the horsepower?
- Greater the DOC the more the horsepower required
- Define or sketch a strobe saw. What is it used for?
- A saw blade with carbide side cutters for cutting out of binding conditions
- What are the two main disadvantages of polycrystalline diamond?
- Expensive, Brittle
- What is the range of depth marks for high quality home furniture?
- .005
- Define incremental programming?
- A type of G-code where every position is relative to the last position
- What is the purpose of the downshear design of router bit?
- Workpiece hold down, reduce TOP face chipping
- What is the disadvantage of an open coated abrasive?
- Wears quicker
- What is the single most important characteristic in a wide belt sander that controls rate of cut and finish?
- Drum hardness or wheel density
- What is the most common operator error for a wide belt sander?
- Not using the full width of the feed table and abrasive belt
- List three of the types of wood composites listed in class
- Insulation board, hardboard, MDF, particleboard, OSB, LVL, paralam, Wf-P, cement board
- In general what is the overall disadvantage of wood composites as a class of material?
- Disadvantages are low dimensional stability, low creep resistance, weight
- What are the disadvantages of a caul system?
- Caul inventory, return system, caul warping, require release agents
- What is the most significant factor in composite boards as far as final physical properties are concerned?
- Particle geometry
- List 3 of the factors affecting the performance of any ring flaker
- Sharpness of knives Horsepower Knife-ring rep
- What is the primary advantage of the 32mm system of furniture manufacturing?
- Does not require skilled labor
- What does RTA mean?
- Ready To Assemble
- What type of glue do edge-banders use?
- Hot melt
- What is the veneer operation used to produce 80-90% of all veneers?
- Rotary peeled
- Name three of the veneer production techniques discussed in class
- Rotary peeled, sawn, quarter sliced, rift sliced, flat or plane sliced, back sliced, quarter round sliced
- What are the four types of bonding types used in plywood?
- Interior, exterior, marine, structural
- What is the most common type of drill used?
- Twist drill
- What does SPC mean?
- Statistical process control
- What is the purpose of the first two heads of a moulder?
- Create reference surfaces
- What is the range of spindle speed for modern moulders?
- 6000-12,000 rpm
- What is the range of depth of tool marks for acceptable building moulding?
- .005mm-.015mm
- List the three types of moulder clamping systems.
- Conventional, Hydro, HSK
- What is the advantage of the helical moulder head?
- Noise reduction, increase tool life, improved surface roughness
- What does CAM mean?
- Computer Aided Manufacturing
- Name three designs of router bits
- Straight bit, compression bit, upshear, downshear, hogging bit
- What is the purpose for the upshear design of router bit?
- Prevent chipping on BOTTOM of workpiece, chip removal
- What is the result of an unbalance tool on tool life?
- Reduce tool life
- What is the advantage of an open coated abrasive?
- Reduce clogging
- What is the purpose of stearate or NO-FIL on coated abrasive?
- Reduce clogging or loading
- What is the single most important characteristic in a wide belt sander that controls the rate of cut and finish?
- Wheel density is the single most important characteristic for rate of cut and finish
- Abrasive planing requires how much HP per inch of width of abrasive belt?
- 3 HP
- Advantage of a conventional carriage?
- Allows you to rotate the log. Rotation allows you to cut for grade