MIL-L-80061B
3.3.4 Surfaces. All surfaces shall be cleaned and free of sand, dirt,
fins, sprues, flash, scale, flux and other harmful or extraneous materials.
All edges shall be either rounded or beveled unless sharpness is required
to perform a necessary function. Except as otherwise specified herein, the
condition and finish of all surfaces shall be in accordance with the manu-
facturer's commercial practice.
3.3.5 Painting. Unless otherwise specified (see 6.2.1) , the machine shall
be painted in accordance with the manufacturer's commercial practice.
3.3.6 Threads. All threaded parts used on the machine and its related
attachments and accessories shall conform to FED-STD-H28 and the applicable
"Detailed Standard" section referenced therein.
3.3.7 Dials. All dials that indicate stock removal or tool movement
shall be graduated in increments not larger than 0.001 inch (US) or .02mm
(SI). Dial diameters shall be such that graduations may be read from the
normal operating position. Dials shall be permanently and legibly engraved
or etched on a non-glare background.
3.3.8 Plates. All words on instruction and indicating plates shall be in
the English language. Characters shall be engraved, etched, embossed or
stamped in boldface on a contrasting background.
3.3.9 Gears. All gears shall be machined from a material suitable for the
intended purpose. All headstock spindle drive train gears shall be heat treated
by a process that will impart the hardness and toughness that will enable the
gear train to transmit full rated torque of the drive motor without gear
damage, failure or premature wear.
3.4 Components, Unless otherwise specified in paragraph 3.11, the type I
and type II lathes shall conform to the following requirements.
3.4.1 Bed. The lathe bed shall be a ferrous casting, treated during the
manufacturing process to retain the lathe accuracies specified in table II.
The bed shall provide the rigidity required to maintain alignment of the head-
stock and tool carrier under all cutting conditions. The bed ways shall extend
from the headstock through the end of the bed to facilitate interchanging
components. All surfaces of the ways on which the tool slides bear for support
or guidance shall be hardened and ground. Cast ways shall have a hardness of
not less than Rockwell C50. Steel insert type ways shall have a hardness of not
less than Rockwell C60.
3.4.2 Base. The lathe base shall be of the cabinet type, fabricated of
castings or steel weldments. It shall be ribbed or braced to provide a firm
support for the lathe. The top of the base shall form an oil tight chip and
coolant pan and shall have a screened reservoir for collecting coolant. The
headstock drive motor and variable speed unit shall be housed within the base.
Space shall be provided for storage of lathe accessories. Suitable means shall
be provided for securing and leveling the base on a foundation.
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