A-A-2551
Table T.
|
Drill diameter
inch |
Overall length +1/8 Inches |
Flute length +1/8 Inches |
|
1/16 |
1-7/8 |
7/8 |
|
5/64 |
2 |
1 |
|
3/32 |
2-1/4 |
1-1/4 |
|
7/64 |
2-5/8 |
1-1/2 |
|
1/8 |
2-3/4 |
1-5/8 |
|
9/64 |
2-7/8 |
1-3/4 |
|
5/32 |
3-1/8 |
2 |
|
11/64 |
3-1/4 |
2-1/8 |
Driving, idler, and pinion gears. All gears shall have beveled teeth free from any imperfections, burrs, or defects which may affect their serviceability. The face width of the gear teeth shall be not less than 23/64 inch (minimum) for the 3/8 inch capacity drills and 15/64 inch (minimum) for the 1/4-inch capacity drills with a maximum backlash of .020 inch. The driving gear shall be of malleable or gray iron, or zinc alloy conforming to SAE 903, with means provided for firmly attaching the crank. The idler gear and driven gear (pinion) shall be of steel or zinc alloy conforming to SAE 903.
Drill capacity. The hand drill shall be furnished with a drill capacity of either 0 up to and including 1/4 inch, or 0 up to and including 3/8 inch, as specified in the purchase order.
Identification marking. Each drill shall be etched or stamped in a permanent and legible manner with the manufacturer’s name or identifying symbol of such known character that the source may be readily identifiable, part number, and country of origin.
Workmanship. All drills shall be free from
imperfections which may affect their safety, appearance, serviceability, or
durability.
Sampling. Sampling for inspection and testing shall be in accordance
with MIL-STD-105, Sampling Procedures and Tables for inspection by attributes,
except where otherwise specified herein. The lot size shall consist of all
drills offered of acceptance at one time. The sample unit is one drill.
Visual and dimensional inspection. Each drill in the sample lot shall be examined for workmanship, marking and dimensional requirements. The inspection level shall be I with an acceptable quality level (AQL) of 4.0 defects per hundreds units.
Testing of end item. The inspection level shall be S-2 with an AQL of 4.0 percent defective.
Drilling test. The drills shall be subjected to drilling a cold-rolled steel (1010 grade minimum) sheet or plate in a vertical position. A vise or clamp shall be used to assure perpendicularity between the drill and the steel plate. The steel sheet or plate shall be not less than 1/8 nor more than 3/16 inch thick. A maximum-size drill bit within the capacity range of the drill shall be inserted in the chuck jaws and the chuck tightened hand. The crank shall be turned by hand with a forward stroke at a speed not less than 80 revolutions per minute (rpm) and not greater than 100 rpm with a 40 pound + 5 pound pressure, applied on large and of the handle. The longitudinal axis of the drill shall be held at right angles to the steel plate. When the drill is about to pierce the opposite side of the plate, the 40 pound load shall be release and normal pressure applied on the handle until the drill has pierced entirely through the plate. Each individual drill subjected to the test shall make at least one such drilling operation to determine that the drill is in compliance with the requirements of this description. The drill and its component members shall show no mechanical defects and shall not fail, fracture, take permanent set or show any evidence of binding or undue wear.
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