Small holes are often finished in the lathe by drilling and reaming without the use of a boring tool.
Fig. 11 shows how a taper hole is bored in an engine piston-head, preparatory to reaming.
The lathe is run very slowly for reaming and the reamer is fed into the work by feeding out the tailstock spindle.
Babbitt metal is also worked dry, ordinarily, although kerosene or turpentine is sometimes used when boring or reaming.
In reaming, a hole is drilled about 1⁄32 inch smaller than is required, and is enlarged with a cutting tool known as the reamer.
The hole should be bored slightly less than the finish size to allow for reaming.
It is also a well known fact that the process of reaming by hand is not a difficult or a slow one.
Young Lieutenant Blood was to his feet holding a reaming glass high as his head.