27f1c7fc___Common_Wood___Lumber_Defects__0
[2] Discoloration of the wood due to overheating caused by friction, and either scorching the wood or the resins within it. Machine burn is caused by stopping or not feeding the wood across the blades at the correct rate of speed. Although species like cherry, pine, or walnut are more susceptible than others, machine burn can almost always be prevented by using sharp blades and correct feed rates. [0] 
Machine Burn
B o w
C h e c k
C r o o k
C u p
S h a k e
S p l i t
T w i s t
W a n e
M a c h i n e B u r n
Sam Rogers' Common Wood & Lumber Defects
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