. Cassier's magazine. -DOUBLE-BELT PLANING MACHINE. MADE BY MESSRS. POLLOCK & MACNAB, LTD.,MANCHESTER, ENGLAND motor driving in the face of such over-loads. In improved machines, reversing andcushioning arrangements appear to pro-duce better results, irrespective of modeof driving, since some high-speededmachines give excellent results withstepped racks and cushioning arrange-ments, equally with the Sellers inclinedscrew and rack Among the devices which have beenattempted is that of a fly-wheel on the Machine Tool Company, Ltd., notablebecause the quick return ranges from170 feet to 21


. Cassier's magazine. -DOUBLE-BELT PLANING MACHINE. MADE BY MESSRS. POLLOCK & MACNAB, LTD.,MANCHESTER, ENGLAND motor driving in the face of such over-loads. In improved machines, reversing andcushioning arrangements appear to pro-duce better results, irrespective of modeof driving, since some high-speededmachines give excellent results withstepped racks and cushioning arrange-ments, equally with the Sellers inclinedscrew and rack Among the devices which have beenattempted is that of a fly-wheel on the Machine Tool Company, Ltd., notablebecause the quick return ranges from170 feet to 210 feet a minute. Herethe rack is retained, but instead of bolt-ing it to the table, it is attached to asliding bar which has a limited longi-tudinal movement in a groove on theunder side of the table. Spindles areattached to a crosshead at one end ofthe bar, carrying adjustable compressionsprings, which absorb the shocks due toreversal. The springs also help to start 136 CASSIERS MAGAZINE. FIG. 4.—A PLANER WITH CUSHION DRIVE FOR EFFECTING REVERSAL AND RETURN EASILY ATHIGH SPEEDS. MADE BY MESSRS. SMITH & COVENTRY, LTD., MANCHESTER, ENGLAND the table on reversal, and so relieve thebelts of some strain. An illustration ofa Bateman Company planer is givenin Fig. 1. By means of fly-wheel loose pul-leys, energy is held in store for rever-sal. The belts are wider than the fixedpulleys, and overlap on the fly-wheelpulleys when thrown off. By this meansmuch of the energy of the fly-wheel istransmitted to the fast pulley. Frictionclutches actuated by the belt shiftingarrangements also assist the fast pulleysto obtain energy conserved in the fly-wheel loose pulleys. It will readily beseen that planers working at thesehigh speeds will be capable of a muchincreased output compared with theolder types, and this firm advertise their60 X 60 machines to plane an areaof 25 square feet per tool per hour. In a planing machine by Smith &Coventry, Ltd., Manchester, England,a cushio


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