Lathes Page: 3
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be mounted on a substantial wood floor, in which case it may be
necessary to brace the floor securely from below to prevent sagging.
b. If the lathe is not level it will not rest evenly on all four legs,
and the weight of the lathe will cause the lathe bed to be twisted,
throwing the headstock out of alinement with the V-ways of the
bed, causing it to turn and bore taper. There are several approved
methods of leveling and securing a lathe. Leveling screws, shims, or
F:I;URE 1.-Toolroom lathe.
hardwood wedges may be used under the feet, adjusting them so that
the bed is level in both longitudinal and lateral positions. A pre-
cision level that is at least 12 inches long and sufficiently sensitive to
show a distinct movement of the bubble when a 0.003-inch shim is
placed under one end may be used in leveling the lathe. A check
must be made across the lathe bed at both the headstock and tail-
stock end. A lathe should be anchored to the floor by means of lag
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/5/: accessed February 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.