A telescopic arbor assembly for a gang of ripping saws disposed between a pair of edgers and secured to the adjacent ends of telescopic shafts of progressively inward increasing length supported by and having slidable driving connection with a longer rotatable axle. One of the edgers is relatively fixed and mounted on a cup-shaped member adapted to contain the saws when the latter are retracted out of operative position whereby the number of saws exposed to the lumber to be ripped may be varied. The other edger is movable with and/or relative to the saws as well as relative to the relatively fixed edger.
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