illustration of several three dimensional reference zones traced by elements of an apparatus 10 according to one embodiment of the present invention the zones traced are three dimensional a generally cylindrical element for example will trace a three dimensional zone shaped like a cylinder a generally planar body rotating on a lengthwise hinge for example may trace a zone in the shape of a sector of a cylinder somewhat resembling the shape of a pie slice generally as mentioned above the feeder assembly 20 traces an imaginary feeder zone 320 as it moves a feeder zone 320 is illustrated in fig2 the saw assembly 80 traces a sawing zone 380 the saw blade shaft 82 traces a shaft interference zone 382 the topper assembly 70 traces a topper zone 370 in one embodiment the topper assembly 70 is positioned relative to the other elements such that the topper zone 370 nearly intersects tangentially the feeder zone 320 in so doing the topper assembly 70 is positioned so it will not interfere with the moving parts of the feeder assembly 20 also the topper assembly 70 is positioned to remove any material that may tend to extend beyond the imaginary boundary created by the feeder zone 320 keeping material within the feeder zone 320 is a goal for this embodiment because the saw blade shaft 82 may be damaged by excess material the saw assembly 80 in one embodiment is also positioned relative to the feeder zone 320 as shown the shaft interference zone 382 also nearly intersects tangentially the feeder zone 320 also as shown for.