Turning and boring tapers . But the taper is now ^ inch in 8 inches or 3^ inch to thefoot, only one-half as great as before. This is shownin figure 7, and shows very plainly that the taper cutby the lathe depends on the length of the piece andamount of offset given the tail stock. To a slightextent it also depends on the hight of the cuttingpoint of lathe tool, which should be at the center. Ifthis cutting point is either above or below the centerthe taper will be slightly less, as the cutting point isthen a trifle farther from the dead center. This doesnot affect it to any great extent, howev
Turning and boring tapers . But the taper is now ^ inch in 8 inches or 3^ inch to thefoot, only one-half as great as before. This is shownin figure 7, and shows very plainly that the taper cutby the lathe depends on the length of the piece andamount of offset given the tail stock. To a slightextent it also depends on the hight of the cuttingpoint of lathe tool, which should be at the center. Ifthis cutting point is either above or below the centerthe taper will be slightly less, as the cutting point isthen a trifle farther from the dead center. This doesnot affect it to any great extent, however, but shouldbe noted. Continuing on the basis that the centers bearagainst the ends of the piece to be turned, which is notpractical, but makes it easier to calculate, we come tothe problem of finding how much to set the tail stockover to turn a given taper on a piece of a certainlength. In practice the tapers turned are usually on theend of a bar, and it should be remembered that the Vz to 8 - /^ to 1 foot Pipe tap taper. Derry Collard CoFigure 7. Taper on 8-inch piece—same offset. length of the taper is of no consequence, as far as set-ting the lathe is concerned, but only the amount oftaper and the length of piece to be turned. If youwant a taper portion 3 inches long on the end of a barthat is 18 inches in length, and the taper is to be i inch Turning and Boring Tapers. to the foot, the tail stock must be set over one-half theamount of taper per foot for every foot of length of thebar. As the bar is i^ feet long, the tail stock mustcome over i Y-z times ^ inch, or 3^ of an inch. We can either reduce the taper to the amount perinch and then multiply this by ^ the length of the barin inches, or find the taper for the entire length andthen move the tail stock over one-half of this. Thelatter is the easiest, as we shall see from the followingexample: Bar is 39 inches long, 2 inches in of ^ inch to foot wanted at one end, and thesmall end must be 13^ inches wh
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