John Jacob Holtzapffel · digital reprint by www.CircuitousRoot.com · leaf 554
the reverse of fig. 522, are obtained when the two chucks have their slides at right angles with that of the spherical horizontal. The line a, d, in the diagram fig. Fig. 526. Fig. 525. 526, as before, indicates the horizontal and b, c, the vertical plane through the mandrel, the oval ring receives… … of the spherical chuck. The cutting edge of the drill is also past the center and the separate ribs or flutes are cut either way from c to d, or from b to d, by a quarter rotation of the mandrel checked by the segment stop. Other useful concave sections result from placing the slide of the…
Ornamental turning
Internet Archive · Dr. David M. MacMillan · Public Domain Mark 1.0. Free to use for anything.
