MIL-G-80267
coolant is provided (see 3.3.10), the top of the table shall have coolant
troughs or similar means for draining spent coolant into its reservoir.
The table shall be provided with a means of securing workplaces in place to
permit precision grinding without drifting. The worktable shall be mounted
on the traversing saddle on type I machines and shall travel in the X-axis
direction. On type II machines, the worktable shall be mounted on the base
and shall traverse in the X-axis direction. The worktable shall be provid-
ed with the necessary protective shields or covers, or both, for lead-
screws, ballscrews, motors, and guideways to guard against the entry of
foreign material. Means shall be provided to prevent table movement after
Stops shall be provided at each end of travel to prevent
positioning.
A digital display shall indicate worktable position (X
table overtravel.
and Y axes). Worktable functions on all machines shall be numerically con-
trolled.
3.3.4.1 Precision-rotary-table-(A/D -axes). When specified (see 6.2.1),
the machine shall be equipped with a 360,000 position precision rotary
table (D axis) or precision tilting, rotary table (A/D axes).
The A axis
represents the vertical rotating axis of the rotary table and the D axis
represents the horizontal rotating axis of the table. The table operation
shall be numerically controlled. The rate of rotation of the rotary table
shall be manufacturer's standard. The size of the rotary table shall be as
specified (see 6.2.1).
For tilting rotary tables (A axis), a tailstock
shall be provided when specified (see 6.2.1). The rotary table shall meet
the accuracy and alignment requirements specified in table II.
3.3.5 Saddle.
Type I machines shall be provided with a saddle. The
saddle shall be a casting of iron or iron alloy designed and proportioned
to withstand maximum loads which may be imposed during operation of the
machine.
The saddle shall be mounted on the base guideways and shall
traverse in the Y-axis direction. Longitudinal guideways shall be provided
on the saddle top to accept a sliding worktable.
Means shall be provided
to prevent movement of the saddle after positioning.
Stops shall be pro-
vided at each end to prevent overtravel.
A digital display unit shall be
provided to indicate saddle position. The saddle slide shall be secured in
place over the entire saddle travel range by either servo devices or
comparable means as directed by the control.
Saddle functions shall be
numerically controlled. Covers, protective shields, or both, shall be pro-
vided for leadscrews, motors, and guideways, as applicable, to guard
against the entry of foreign matter.
3.3.6 Bridge. Type 11 machines shall be constructed with a cast iron,
bridge-like member. It shall be internally ribbed and braced to minimize
distortion and deflection experienced under maximum design loads. The
bridge shall be fixed, supported on two vertical box-type columns located on
either side of the base casting, simulating a bridge over the base and
worktable. Horizontal guideways shall be provided on the bridge to accept a
moveable cross carriage assembly and to allow the cross carriage to move in
the Y-axis direction.
On machines with a cross rail, vertical guideways
shall be provided in the columns supporting the cross rail to allow the
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