The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . ver again for sev-eral years. No. 9. The dog. SeeFig. 90 among the for-ging exercises. The mainshank is now to be cen-tered, the head dressed,drilled, tapped, and fur-nished with a steel set-screw with a hardenedpoint. The dog will thenbe available for use in thelathe. If the supply ofdogs is ample, a new ex-ercise in drilling may besubstituted. No, 10. The pin andflanged nut. Fig. 133gives two views of thepin, and a section of theflanged nut.
The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . ver again for sev-eral years. No. 9. The dog. SeeFig. 90 among the for-ging exercises. The mainshank is now to be cen-tered, the head dressed,drilled, tapped, and fur-nished with a steel set-screw with a hardenedpoint. The dog will thenbe available for use in thelathe. If the supply ofdogs is ample, a new ex-ercise in drilling may besubstituted. No, 10. The pin andflanged nut. Fig. 133gives two views of thepin, and a section of theflanged nut. The mate-rial is all cast-iron. Theexercise contains a greatvariety of points, and callsinto use many tools andprocesses. Both threadsare cut on the lathe, andall surfaces are to be fin-islied. It is obvious thatthe pin may be used asecond time, with lessdimensions; the flanged nut may be used with a larger pin. No. 11. Shaft couplings. Fig. 134 shows how two piecesof shafting may be coupled together, and how flanged collarsand pulleys may be fitted to the same. All except the piecesof shafting are shown in section, and four kinds of fitting are. Fig. 133. 148 THE THIRD, OR SENIOR YEAR. [Chap. W. illustrated. The combined piece is finally finished in the latheas a unit. The disks are usually about five inches in diameter, and the whole length is aboutfourteen inches. The flanges areof cast-iron, while the shafting iswrought-iron. Each of the fits has a method peculiar to itself,and gives opportunity for valuableexperience. In marking the results of thiswork the teacher should deter-mine his scale as he goes overand explains the work before theclass, and this scale should befully known and understood bythe class. Moreover, the workshould be passed upon at everystage. A poor job of lathe-workshould not be covered or con-cealed under a long job of filingin the speed lathe; nor shouldone error in dimensions be can-celed by another. The methodsby which a result is reachedshould be
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmanualt, bookyear1906
