The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . asmyth sinventions, and beyond the tact tV^it it has a reciprocating non-,cutting return stroke it bears no resemblance to the older machine.,Its design is briefly as follows: The piece ot work to be shaped isattached to the top, or one of the vertical side faces, of a right-angled bracket or brackets. These are carried upon the face of amain standard and are adjustable thereon in horizontal and verticaldirections. In small machines the ram or reciprocating arm (seefig. 44. C) slides in fixed guid
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . asmyth sinventions, and beyond the tact tV^it it has a reciprocating non-,cutting return stroke it bears no resemblance to the older machine.,Its design is briefly as follows: The piece ot work to be shaped isattached to the top, or one of the vertical side faces, of a right-angled bracket or brackets. These are carried upon the face of amain standard and are adjustable thereon in horizontal and verticaldirections. In small machines the ram or reciprocating arm (seefig. 44. C) slides in fixed guides on the top of the pillar, and thenecessary side traverse is imparted to the work table S. To the topof the main standard, in one design, a carriage is fitted with hori-zontal traverse to cover the whole breadth, within the capacity ofthemachine, of any work to be operated on. In the largest machinestwo standards support a long bed, on which the carriage, with its,ram, traverses past the work. These machines are frequently madedouble-headed, that is carriages, rams and work tables are dupU-. Fia. 45.— Stroke Slotting Machine. A, Main framing. •^• oTi/l • B, Driving cone. .«i:Jfn C, D, Gears driven by con^s. E, Shaft of L. . , ^ J J rr F, Tool ram driven from shaft E through disk C and rod H, with quick return mechanism , Counter-balance lever to ram. than the actual work of cutting. Hence a strong case is oftensutcd (or the abandonment of the common practice. But, on theother hand, the centre o( gravity of the movinj table and worklies low down, while when the cross-rail and housings with thp cut-ting tool are travelled and reversed, their centre ol gravity is high,and great precautions have to be taken to ensure steadiness olmovement. Several planers are .made thus, but thev are iiearlyall o( extremely massive type—the pit planers. The device isseldom applied to those of small and medium dimensions. ^ But there is a great group of planers in which
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
