OO-S-256K/GEN
with specified requirements. The contracting officer, at his/her discretion may require a physical sample and/or testing of the proposed substitution. Testing will be done during first article or if no first article is required, prior to acceptance of the first production unit.
3.5 Design and construction. All sewing machines to be furnished under this specification shall be of the type normally used for industrial purposes (see 4.4.5). Unless otherwise specified (see 6.2), all machines provided shall include head, stand, table top, electric light fixture,
motor or electric transmitter, drive belt, motor control, switch, thread
stand, bobbin winder, oil drip pan, and knee or foot lifter, as applicable. The commercial feed mechanisms shall be as shown in table I. The applicable feed mechanisms for the machines shall be as specified in the detail specifications. Unless otherwise specified (see 6.2), the machine shall operate on nominal 120 volts, 60 hertz, single phase. When specified (see
6.2), all electrical components and circuit elements, including terminal
and circuit connections, shall be coated for fungus-resistance with varnish conforming to ASTM D3955, except that the current-carrying contact
surfaces, such as switch contact points, shall not be coated. Motors shall have windings impregnated to resist moisture. Machine stitching shall conform to the applicable class of ASTM D6193. All wiring methods shall conform to NFPA 70. All connections shall be soldered, taped, or have staked connections. The solder shall conform to type RO of J-STD-004 and the tape shall conform to ASTM D4388.
TABLE I. Feed mechanisms, styles
A - Drop feed
B - Drop feed with alternating pressers
E - Drop feed with differential feed
F - Needle feed with feeding foot
G - Compound feed
H - Compound feed with alternating pressers
J - Upper feed
K - Gear driven feed
L - Ratchet and pawl feed
0 - Universal upper feed
3.5.1 Motors. All motors including those used in transmitter shall conform to NEMA MC 1 or UL 1004. They shall be a minimum 1/2 horsepower except where noted in detail specifications. Motors shall be mounted or suspended so the pulleys of motor or clutch and machine head are in straight belt alignment.
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