2. In long work, where the lathe is used to turn up the article, and where the drilling can be done at the same time.
3. Anything that can be chucked in a lathe.
4. Where the work is long and cannot be fixed in a drilling machine. The long bed of the lathe gives room for holding such work.
| Fig. 40. Internal Set | Fig. 41. Set for Brass [ToList] |
The Rake of the Drill.—A boring tool requires some knowledge in setting. It should have a greater top rake than for the outside work, and the cutting edge should also be keener, as a rule
In this class of work the material bored must be understood, as well as in doing outside work.
The hooked tool, [Fig. 40], is shown to be considerably above the center line, and at that point it will do the most effective cutting on steel. If, on the other hand, brass is operated on there should be no[p. 45] top rake, as illustrated in [Fig. 41], thus assuring a smooth job.