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TM 38-260
7-7. Analytical Test Procedures
a. The methods, procedures, and equipment to be used in connection with the performance of analytical tests
are contained on the test patterns for analytical inspection of metalworking machinery DGSC Forms 900 to 1000 Series.
b. The instructions outlined in (1) through (10) below apply to machine tools in general and not to any specific
machine.
(1) Cleaning. The machine ways, table, and other working surfaces must be clean and free of burrs to allow for
accurate analytical inspection.
(2) Leveling. The machines must be level to accomplish an accurate alignment test. On small solid base
machines (4 by 4 ft) (1.22m x 1.22m), leveling is not so important; however on long machines, such as engine lathes, it is
very important, and only skilled personnel should attempt the procedure. Only precision levels shall be used. The
machine shall be level within its own structure, and legs or base of the machine, shall be leveled as close as possible.
The precision level bubble should settle between the two main cross lines when placed on the table work surface in any
position.  On the majority of machines, such as milling machines, drills, and lathes plus or minus one division is
acceptable depending on the accuracy desired. In all cases, the machine shall be placed on a solid foundation to keep it
from creeping or rocking when in operation.
(3) Flat bearing surfaces. All flat bearing surfaces shall be checked for less than 0.0015 (0.04mm) inch feeler
gage entry. This shall be adjusted tight enough to allow free manual movement without binding or looseness between
contacting bearing surfaces.
(4) Internal spindle tapers.  After determining the correct spindle taper, thoroughly clean internal taper.  If
possible, feel inside the spindle taper to check for the presence of nicks. If nicks are present, a fine round abrasive stone
may be used for their removal under power. Reclean inside the spindle taper to inspect the bearing pattern. Apply a light
coat of red lead paint or prussian blue ink to the correct test arbor shank and insert into the taper. Remove and check the
arbor for the bearing pattern. Eighty-five percent bearing contact, evenly distributed along the taper is desired.
(5) Spindle end play. Before inspecting for spindle end play in the bearings, it is recommended that the spindle
be rotated under high speed to bring the bearings to normal operating temperature. Mount the indicator on the face of the
spindle, thrust the spindle into the spindle head, and set the indicator dial on zero. Thrust the spindle outward and record
the reading. When the indicator stand is placed on the table and the thrust is applied, check to make sure that the table is
locked tight to avoid false readings. The movement of the spindle end play, not the movement of the table is being
checked.
(6) Spindle run-out. Clean thoroughly and insert the test arbor firmly into the internal taper. If possible, a draw-in
rod should be used to pull the test arbor into the spindle head. When the machine is of the type where draw-in rods are
not used, be sure the test arbor is inserted in
7-10

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