Lathes Page: 61
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b. Hand reamers are used for various types of work in the lathe,
and when it is necessary to finish a bore in this manner the follow-
ing rules must be observed:
(1) Lock lathe spindle by placing it in low gear.
(2) Have hole within 0.005 inch of required finish size.
(3) Support reamer with tailstock center.
(4) Revolve reamer with a wrench and feed simultaneously with
tailstock hand wheel.
- .. ..
L a i
FIGE, 5.--Reamillng on lathe.
(5) Never turn reamer backward.
38. Boring.-a. The purpose of boring is to enlarge holes thtt
have previously been drilled or cored. For this operation, the tool
bit is attached to or forged on the end of the boring bar which is
clamped in a holder and securely held on the compound. The bor-
ing tool is fed in the same manner as a turning tool with the ex-
ception that the depth of the boring cut is increased by moving the
carriage in the opposite direction. Commercially manufactured bor-
ing bars should be used in preference to the hand forged types whel-
ever possible, since better results can ordinarily be obtained with
them. The boring bar should always be as large as the hole will
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/63/: accessed February 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.