. American engineer . ear type. The bed is of sufficient length to bore andface car boxes 6 in. x 12 in. The headstocks are bolted di-rectly to the bed and are of sufficient height to give a clear-ance of 13 in. from the center of the spindle bearing to thetop of the bed. The spindles are of cast iron 4J4 in- in diam-eter with a 17 in. bearing in the headstock and carr3 steel toothgears which revolve loosely on the spindles and are connectedto them by sliding tooth steel clutches which are keyed to thespindle and actuated by an eccentric lever. The pinions areof bronze or steel while the drivi
. American engineer . ear type. The bed is of sufficient length to bore andface car boxes 6 in. x 12 in. The headstocks are bolted di-rectly to the bed and are of sufficient height to give a clear-ance of 13 in. from the center of the spindle bearing to thetop of the bed. The spindles are of cast iron 4J4 in- in diam-eter with a 17 in. bearing in the headstock and carr3 steel toothgears which revolve loosely on the spindles and are connectedto them by sliding tooth steel clutches which are keyed to thespindle and actuated by an eccentric lever. The pinions areof bronze or steel while the driving gears are of cast iron. Steel boring bars 3 11/16 in. in diameter are supplied forboring 5 in. diameter boxes and larger. The bars are securedto the ends of the spindles by sockets and are supported atthe opposite end by bearings. These can be operated simultane-ously or independently as desired. The carriages have a sliding motion on the bed by either handor power, and are also provided with a quick hand motion by. Journal Bearing Boring IVIachine; Detricl< & Harvey. a spider to the rack. A slow hand motion is provided by ahand wheel on the end of the screw. The power feed is ar-ranged by means of a spur gear at the end of the bed furthestfrom the headstock where the motion of the feed mechanismis taken from the spindles by enclosed gears. Each spindle hasindependent feed changes and feeds for the carriage are ar-ranged for 1/16 in., ]/$ in. and 3/16 in. per revolution of thespindle. Each carriage carries a cross slide on which twoother slides are fitted, being adjusted to and from the centerline of the spindle by a right and left hand screw. The slidessupport the gripping jaws for holding the journal bearings anda clamp is provided at the top to prevent any springing ofthe parts. The carriages contain opening and closing nutsoperated by a lever. The machine is arranged to be driven by a 12j4 h. p. motorwhich should have a speed variation between 1 and 2, givingspindle s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
