OO-S-256 Sewing Machine, Industrial, General Specification ForThis specification covers the general requirements for commercial, industrial sewing machines used in the textile and leather industry. The specific requirements for the individual sewing machines are covered by the detail specifications listed in 6.6.

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OO-S-256K/GEN

4.4.3 End item dimensional examination. The end item shall be examined for conformance to the dimensions specified in 3.5.4, 3.5.8, and in the applicable detail specification and drawing(s). Any dimension that is not within the specified tolerance shall be classified as a defect. The lot

size shall be expressed in units of sewing machines of one type and class only. The sample unit shall be one sewing machine. The inspection level shall be S-2 and the AQL, expressed in terms of defects per hundred units, shall be 6.5.

4.4.4 End item testing. Each end item shall be tested as specified in

4.5.1, 4.5.2, and 4.5.3. Any failure to conform to the requirements in

3.6.1, 3.6.2, and 3.6.3 shall be cause for rejection of the end item.

4.4.5 Certification compliance examination. Certification of OSHA, NFPA, NEMA and UL, where applicable, shall be furnished and acceptable to the Government representative for the first article when required and all production items. In addition, certification shall be furnished that the machine being furnished is of the industrial use type (see 3.5) and that the machine meets the stitches per minute requirement in the detail specification.

4.5 Methods of inspection.

4.5.1 Operational test. Each sewing machine head as specified shall be operated for not less than 10 minutes. The machine shall be operated with material comparable to the applicable kind of duty or class of the machine. The machine shall meet the operational requirements of 3.6.1.

Nonconformance with 3.6.1 shall constitute failure of the test.

4.5.2 Bobbin winder test. During the operational test (4.5.1) install an empty bobbin in the bobbin winder and wind the bobbin until it has achieved full capacity. Nonconformance with 3.6.2 shall constitute failure of the test.

4.5.3 Tension control test. During the operational test (4.5.1) the thread tension shall be inspected. Nonconformance with 3.6.3 shall constitute failure of the test.