. American engineer and railroad journal . T3T The Shimer Cutter Heads with Four Bits and Expansion Device. tool, set of bits or knives will not make the tongue and groovealike in all kinds of wood. The bits rest within conical duplexbit seats to line up their cutting edges to under-cut and over-rut, with clearance for single tongue and groove flooring,ceiling, siding and wainscoting. Every part of the cuttingedge of these bits is protected with clearance and a new cut-ting edge is brought full and sharp at each filing and settingof the bits. The cutter head is protected against injury, if the
. American engineer and railroad journal . T3T The Shimer Cutter Heads with Four Bits and Expansion Device. tool, set of bits or knives will not make the tongue and groovealike in all kinds of wood. The bits rest within conical duplexbit seats to line up their cutting edges to under-cut and over-rut, with clearance for single tongue and groove flooring,ceiling, siding and wainscoting. Every part of the cuttingedge of these bits is protected with clearance and a new cut-ting edge is brought full and sharp at each filing and settingof the bits. The cutter head is protected against injury, if thedriving belt should break with the feed on, by reason of theconcave bit seats which are provided; brass heads with flatseats, have often been injured by such an accident. Thestrength of the heads and this concave feature in the bit seatsmakes these tools practicably indestructible. The concaveseat with its duplex incline, includes another good is that the bit tapers both ways from its largest diameter,when the heaviest in-cut i
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
