00-S-256/14A
3.2 Class 2, machine. The class 2 machine shall be reversible with the
capability of sewing light to medium cotton and nylon duck, light to medium
tape and webbing, and 3/32 to 3/16 inches in diameter cords utilizing metric
needle sizes 120, 125, 130, 140, and 180. The machine shall operate at
speeds not less than 1500 or greater than 2500 stitches per minute. The
machine shall be manually lubricated. The mounting shall be fully submerged.
Each machine shall be supplied with a bobbin winder and a knee lifter.
3,2.1 Class 2, machine feed. The class 2 machine feed shall be equipped
with a reversible type A feed and a walking presser foot. The walking presser
foot shall consist of an inside foot and an outside foot. The feed dog shall
have four rows of teeth. They shall include one full row on each side of the
needle opening and two partial rows in front of the needle opening. The teeth
shall be spaced a minimum of 16 teeth to the inch.
3.2.2 Class 2, presser feet. In addition to the walking presser foot
required in 3.2.1, the class 2 machine shall be furnished with grooved presser
feet as specified on Drawing 6-1-9365.
3.2.3 Class 2, throat plate. The class 2 machine shall be supplied with a
heavy duty throat plate. The throat plate shall be alloy steel and air
hardened to a Rockwell C 48-56.
3.2.4 Class 2, stitches. The class 2 machine shall provide a minimum of 5
to an unlimited number of stitches per inch.
3.2.5 Class 2, width of the stitch. The class 2 machine shall produce a
maximum stitch width of 3/8 of an inch.
3.2.6 Class 2, height under the presser foot. The class 2 machine shall
provide a minimum height of 25/64 of an inch under the presser foot.
3.2.7 Class 2, working room to the right of the needle. The class 2
machine shall be furnished with a working room distance to the right of the
needle of 10 inches minimum to 20 inches maximum.
3,2.8 Class 2, table top. The class 2 machine shall be furnished with a
type 11 table top. The outside dimensions of the table top shall be 20 by 40
by 2 inches thick with a ± 1/4 of an inch tolerance for each dimension.
3.2.9 Class 2, spare parts. The class 2 machine shall be furnished with
the following spare parts in the quantity indicated:
Spare parts for class 2 machine
Quantity
Item Identification
2
Face plate screw
1
Tension release pin
1
Thread take up spring
1
Thread tension stud
4
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