. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . tK;. •^.—uomDination planer. and run in yoke boxes. There is a bonnet chip-breaker, and a complete set of pressure barswhich have every desirable adjustment. The lower cylinder may be set for any desired cut,and the end of the bed will swing down to admit of easy access to the head for sharpeningor setting the knives. The bed is raised and lowered on four screws by hand or by power ;and when power is used, an adjust
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. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . tK;. •^.—uomDination planer. and run in yoke boxes. There is a bonnet chip-breaker, and a complete set of pressure barswhich have every desirable adjustment. The lower cylinder may be set for any desired cut, and the end of the bed will swing down to admit of easy access to the head for sharpeningor setting the knives. The bed is raised and lowered on four screws by hand or by power ;and when power is used, an adjustment of 8 in. is accomplished in one minute. When setto proper thickness, the lower cylinder, while firmly clamped to the bed, is also clam])ed tothe sides of the frame. The gears on the feed rollers are of aljout double the diameter of thelatter, giving great leverage. Each pair of feed-roll boxes is connected in a yoke frame to. The Rogers double surfacer. avoid the possibility of cramping, and all links are hung on boxes instead of on roll shafts.The feed is driven direct from the top cylinder, through two feed shafts provided with conesgiving four changes of speed. The Smith Double Surfacer.—In a 26-in. cabinet double-surfacing planer made by theH. B. Smith Machine Co., there are some features which are absent from some others of thesame general type. Thus, for undersurfaeing, the bed is supported on four screws, one undereach nut of the cutting cylinder, and the curved pressure bar over the underhead is veryrigid, thus giving stiffer and truer work with the undersurfaeing head than would be the PLANING MACHINES.—WOOD. 631 case without these features. The feeding-in rolls have a weighted equalizing bar to give aparallel lift and prevent cross strain on the gears. There is a spring device to overcome theinertia of the weighted rolls whtm extra thick stock is being entered, and to lessen liabilityof break