MIL-B-80272
The jig boring machine shall consist primarily of a
Components.
3.4
base, columns, fixed or traveling cross-rail, spindle carrier, spindle and
quill assembly, worktable, saddle driving mechanisms, and operating con-
trols.
3.4.1 Base. The base shall be a casting or weldment ribbed and braced to
The base shall form a
minimize distortion, deflection, and vibration.
foundation for the entire machine and shall provide positive means for
When applicable, an access door(s) or
securing the column to the base.
removable plate(s) shall be provided for servicing components housed within
Precision finished guideways shall support and guide a saddle.
the base.
Means for
Gibs or other means shall be provided to compensate for wear.
securing and leveling on a foundation shall be provided.
3.4.2 Column. The columns shall be a casting or weldment of box-type
construction, internally ribbed and braced to minimize distortion, deflec-
The overall assembled construction shall provide the
tion and vibration.
required rigidity for accurate heavy metal removal cuts, and precision
Precision guideways shall
finish cuts under various machining conditions.
provide full contact and support of the spindle head assembly throughout its
Gibs or other means shall be provided to compensate for
travel range.
wear.
3.4.3 Spindle head. The spindle head for type I machines shall consist
of the spindle motor and spindle drive mechanism, a vertically traversing
saddle containing the spindle and quill assembly, saddle elevating mecha-
nism, and a sliding shaft for transmission of power from the spindle motor to
the saddle. The saddle shall be positioned vertically on guideways fitted
to the spindle head. The spindle head shall traverse horizontally on ways
The spindle head for type II machines shall
of the fixed cross-rail.
consist of the spindle motor, spindle drive mechanism and spindle and quill
assembly.
The spindle head shall be mounted on ways of the traveling
Vertical travel of the
cross-rail and traverse horizontally thereon.
spindle head shall be provided by traverse of the cross-rail on ways of the
columns.
The spindle head or saddle shall be positioned by power actuated
by the operator or control command.
The spindle head shall be counter-
balanced for ease of operations and conservation of energy.
An automa-
tically operated clamping device shall hold the head securely in the
selected position.
3.4.4 Spindle and quill assembly. The spindle and quill assembly shall
include the spindle, quill, and its related components.
The spindle shall
rotate and be supported in the quill on antifriction bearings.
Spindle
rotation shall be reversible for tapping operations.
Unless otherwise
specified (see 6.2.1), the spindle nose shall be the manufacturer's standard
quick tool change type, or when specified (see 6.2.1), collets, or spindle
tool adapters shall be provided for holding the size and type taper and
straight shank tools as specified by the procuring activity,
The spindle
assembly shall have power feed with provision for manual and tape selection
of rapid and normal spindle positioning rate.
Means shall be provided to
prevent overtravel and damage to the feed mechanism. A spindle rotation
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