MIL-M-80269
mounting surface of the worktable and shall be designed to prevent distor-
The machine shall
tion to the head due to torsional forces of the drives.
have stops that are located at the upper and lower extremes of Z axis travel
to prevent excessive overtravel.
The spindle shall be of alloy steel hardened
3.4.4.1 Spindle assembly.
and ground to a finish not rougher than 32 microinch. The spindle shall be
supported and held in axial and radial alignment by ball or roller bearings.
The spindle shall be mounted in the machining head with its bearings
The spindle
designed and arranged to compensate for thermal expansion.
shall have positive means for accepting, retaining and releasing tools and
tool holders inserted by either the automatic tool changer or the operator.
Unless otherwise specified (see 6.2.1), the spindle shall accept sizes 24 or
The spindle shall be
50 "V" flange tool shanks complying with ANSI B5.50.
equipped to orient the automatically inserted tools to maintain the same
The machine shall drive
radial position they occupied in the tool changer.
the spindle in both the clockwise and counterclockwise directions of rota-
tion for accomplishing the full range of spindle speeds specified herein.
The machine shall be arranged to automatically stop spindle rotation for
tool change. The machine shall have overload protection which automatically
stops the movement of all slides and the rotation of the spindle should it
stall from overload.
3.4.5
Tool changer.
The machine shall have an automatic tool changer
with a magazine capable of storing not less than the tool capacity required
for the style machine specified in the contract or order,
The magazine
shall be of the rotary drum design or of any other closed loop recirculating
configuration with the capability of presenting a preprogrammed tool to the
tool changer for exchange with the tool held in the spindle at the time of
programmed commands for tool change.
Tool change shall be accomplished by
means of a power-actuated mechanism which shall either interchange the tool
in the spindle with a tool selected from the tool magazine or remove the
tool from the spindle and then insert the tool from the magazine.
The
magazine shall permit convenient loading and unloading of tools, tool
holders, and adapters during operational set-up. The tool changer shall be
arranged for random tool selection which shall include the capability of
reusing a tool that has been returned to the magazine after a program
operation.
3.4.6
Guideways.
All guideways shall be designed and constructed to
permit precision control and movement of mating components.
The guideways
shall be hardened and ground. Mating slides shall have means of maintaining
alignment to prevent cutting forces from separating slide surfaces or
distorting feed screws. The guideways shall be shielded from chips, coolant
fluid and other contaminants by telescoping metal covers or similar means.
3.4.7
Coolant system.
The
coolant system shall include a sump or
reservoir, a power driven pump
and all necessary piping.
The sump or
reservoir shall have sufficient
capacity to permit full flow of coolant.
The system shall have means for
draining and cleaning and shall include a
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