Major Factors That Affect The Severity and Frequency of Wood Machining Defects
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1 Major Factors That Affect The Severity and Frequency of Wood Machining Defects Tool geometry Feed rate Grain direction Species Moisture content (MC) * Defects can be caused from a combination of more than one.
2 First, Before We Get to Deep, How Does Wood Cut? A force being applied to the wood causes failure in the wood structure that produces the separation This failure is affected by the strength properties of the wood which in turn is impacted by the moisture content. the strength is affected by moisture content
3 Let s Start with Tool Geometry Three angles Rake or hook angle Clearance angle Sharpness angle The three = 90 degrees
4 The larger the back clearance angle the more airflow at the knife tip.
5 Hook Angles Can Affect the Type of Failure or Chips Being Produced Too large (steep) = Tearout (type 1 chip) Full control of the cut (type 2 chip) Too small = Fuzzy grain (type 3 chip)
6 Hook Angles Are Determined By? The species of wood being machined The MC of the wood being machined Machining and Related Characteristics of United States Hardwoods E.M. Davis, Forest Products Laboratory, Technical Bulletin No Wood Machining Processes, Peter Koch 1961
7 Generally Speaking the Softer the Wood the Greater the Hook Angle. The Harder the Wood the Smaller the Hook Angle 12 : Oak, Hickory, Maple 30 : Eastern White Pine, Western Redcedar
8 How About Feed Rate? The faster the feed rate of the machine: Less KMPI (knife marks per inch). Quality is determined by KMPI. More chip load per knife. May increase our chip load/size causing tear out (a minimum of.020 is recommended by Wienig).
9 12 knife marks KMPI is optimum
10 Grain Direction? With the grain Against the grain
11 How Does The Species Affect Machining? Red Oak cross section Sweet Gum electron microscopic view Sycamore cross section White Pine electron microscopic view
12 How Does The Moisture Content or Drying Affect Machining? Target MC for most plants 6-8 % MC Too wet (above 11%) - fuzzy grain Too dry (below 6%) - chip out Drying stresses Case hardening & reverse case hardening Primary wood Wood machined with a MC of 8% will machine with less machining defects than if machined with a MC of 6% Machining and Related Characteristics of United States Hardwoods E.M. Davis, Forest Products Laboratory, Technical Bulletin No. 1267
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14 Common Machining Defects Tear out Fuzzy grain Raised grain Chip bruising Knife burn Chatter Snipe Planer Split Bow/crook
15 Chipped Grain/Tear Out Too large a hook angle Grain swirls/direction Feed rate Depth of cut Improperly set chip breaker Dull knives Too low MC
16 Fuzzy Grain Too small hook angle Tension wood High MC
17 Too low hook angle Dull knives Excessive jointing Excessive pressure by feed rolls, hold downs, chip breakers, and pressure bars High MC. above 12% Raised Grain
18 Dulling Tools Sharp Tool Dull Tool
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20 Chip Marks/Chip Bruising Exhaust system Knives sticking out of the cutterhead to far MC weight?
21 Chatter Spindle bearing wear Loose dovetail slides Unbalanced cutting tools Pressure shoe and chip breaker not properly positioned. Chip breaker roughly 1/8 deflection Pressure shoe deflection Spring tension not properly adjusted on the pressure shoe and chip breaker. Uneven lumber.. lumber not dried flat
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23 Burn Marks Stock not being fed continually through the machine. Improper grinding techniques (side clearance?). Dull tooling Stressed warped lumber
24 To Help Prevent Boards From Developing Bow or Crook After Machining Remove an equal amount of material off of all sides of the stock. Good Bad
25 Snipe Cutterheads not set tangent to outfeed bedplates or fences. Chipbreakers, pressure shoes, and holdovers not correctly set. Fences and or bedplates not properly aligned to one another. Warped stock Note: Move bedplates, chipbreaker, and pressure shoe to within an 1/8 of the cutting circle.
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30 Planer Split Avoid low MCs, which make wood more brittle and increase cup; more cup in low grade is unavoidable Feed roll pressure Avoid excessive pressure from rollers or knives Board can regain shape after surfacing Rip board in half before planning
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