MIL-G-80267
The base shall support the column(s), bridge, spindle housing
deflection.
assembly, worktable, saddle, and cross carriage, as applicable.
The cool-
ant; hydraulic and. electrical systems shall be separate external units.
When applicable, an access door(s) or removable plate(s) shall be provided
Guideways shall be provided to accommodate
to service units housed within.
either a sliding saddle or worktable, as applicable. Means shall be provid-
ed to level the machine.
3.3.2 Column-assembly: Each column shall be a one-piece casting of box-
like construction, Internally ribbed and braced to minimize distortion and
deflection under normal loads. The column on type I machines shall accommo-
date the main spindle housing assembly and its associated components.
Guideways shall serve to support and guide the spindle housing assembly
Means shall be provided to
through its full range of vertical adjustment.
protect column ways from dirt. Means shall be -provided for vertical adjust-
ment of the spindle housing assembly with a device to securely lock the
spindle housing assembly in any location within its vertical range. A
graduated scale or some other visible means shall be provided to return the
spindle housing assembly to the same location after assembly movement. The
machine shall have either stops or limit switches located at the extremes of
spindle housing assembly motion to prevent excess travel of the spindle
Type II machines shall meet the same basic requirements as the
assembly.
type I machines except that they shall have a double column, bridge and
sliding cross carriage configuration accommodating the main spindle housing
assembly.
Spindle -housing -assembly.
The spindle housing assembly shall
3.3.3
include, but not be limited to, the main drive spindle and the grinding
spindle or head with corresponding feed and speed mechanisms, vertical slide
handwheel, spindle housing clamp, adjustable depth stop, heating elements,
and means for indicating housing temperature. The assembly shall be made of
a nickel iron alloy with a low coefficient of thermal expansion.
Means
shall be provided in the spindle housing assembly to simulate bearing run-
ning heat when the spindle is not running but the machine is operative to
minimize the effects of expansion and contraction due to temperature changes
common with variations in spindle operation. The assembly shall be mounted
on the column or cross carriage guideways, as applicable, and shall traverse
vertically (W axis). The assembly shall be balanced and counterbalanced. A
non-influencing clamping mechanism shall be provided to lock the assembly to
the column at any position within its vertical travel.
The main spindle
shall be of steel alloy and shall rotate in preloaded ball or roller bear-
ings. The motor that drives the grinding spindles or heads shall be either
an electric or pneumatic type.
Provisions shall be made to adjust the
spindle speed in either continuous adjustment or in steps of not greater
than 10 percent. The grinding head shall be designed to accommodate grind-
ing wheels mounted on 3/8 and, when specified (see 6.2.1), 1/4, and 1/8 inch
shanks using adapters, if required.
Means shall be provided to indicate
vertical spindle housing assembly location.
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