Abstract
A power-driven increment borer was developed from commercially available components. The power source is a 58-cc gasoline chainsaw motor which provided power sufficient to bore conifers up to 80 cm in diameter. The chain drive was converted to the rotary action needed for turning the increment borer by an Atom drilling attachment. This attachment can be adapted to all standard chainsaw motors and has forward, neutral and reverse gears. The borer was tested on over 200 western hemlock 30–60 cm dbh, over 1000 lodgepole pine with dbh up to 30 cm and a number of Douglas-fir up to 30 cm dbh. The cores were clean and easily read and the mechanical efficiency of power boring greatly exceeded that of manual operation. The unit is portable and can easily be handled by one person.
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