A-A-2937A
3.4 Construction. The reamer shall be fitted with removable cutting
blades that shall be adjustable for reaming holes of any size within the range
for which the reamer is designated. The reamer shall have straight, round
shanks with square ends. The shanks shall be concentric with the cutting edges
within 0.001” total indicator reading (tir) as measured between centers. The
body portion of the reamer shall contain slots for holding the blades. The
reamer shall be constructed to permit an adjustment of not less than 0.03 5“
between the minimum and maximum size attainable with any one set of blades. The
reamer assembly shall be capable of reaming round, straight and smooth holes
free of chatter marks within any size range. The pilot bushing of the reamer
shall have a surface roughness of not more that 25 microinches arithmetical
average (aa).
3.5 Blades. The blades shall be accurately machined and ground in sets
to properly fit slots provided on the body of the reamer. Tolerances for the
length of individual sets of blades shall not exceed plus or minus 0.0025”, The
width of the blades shall be uniform and interchangeable for the same size and
make of reamer. Cutting surfaces of blades shall be concentric with the axis of
the body in all positions throughout the range of adjustment. An adjusting nut,
located at opposite ends of the blades, shall facilitate the adjustment of the
blades. Blade ends shall be ground and rounded so that the blade ends do, not
damage the adjusting nut, or washer when used.
3.6 Adjusting Nuts. Adjusting nuts shall have at least two flat sides, or other suitable means not requiring special tools or wrenches, for the expansion adjustment.
3.7 Hardness. The full length of the cutting edge of the reamer shall be
hardened and tempered to a Rockwell “C” Scale value from 61-67 per ASTM E18.
3.8 Threads. The reamer shall have fine threads in accordance with
FED-STD-H28.
3.9 Interchangeability. All part shall be designed and manufactured to
definite standards, clearances and tolerances in order that any such parts of
particular type or model maybe replaced, interchanged and adjusted without
modification of the replacement part or any-other parts of the unit.
3.10 Identification Marking. The reamer shall be marked with the
manufacture’s name or identifying symbol, and the state or country of
manufacture. All identification markings shall be engraved, etched, molded or
indented directly on the item’s surface in such a manner that it remains
clearly legible throughout the life of the item. The reamer blades shall be
marked in sets with the reamer’s nominal size. In addition, the reamer shall be
marked with the words “High Speed” or “High Speed Steel” or the corresponding
abbreviation.
4. REGULATORY REQUIREMENTS.
4.1 Recovered Materials. The offeror/contractor is encouraged to use
recovered materials to the maximum extent practicable, in accordance with
paragraph 23.403 of the Federal acquisition Regulation (FAR).
4.2 Metric Products. Products manufactured to metric dimensions will be
considered on an equal basis with those manufactured using inch-pound units,
provided they fall with the tolerances specified (using conversion tables
contained in the latest revision of Federal Standard 376) and all other
requirements of this document are met. If a product is manufactured to metric
dimensions and those dimensions exceed the tolerances specified in the inch-
pound units, a request should be made to the contracting officer to determine
if the product is acceptable.
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