2-11. OPERATING PROCEDURES FOR CLOTHING SEWING MACHINE.
Always perform the "BEFORE" preventive maintenance checks and services (PMCS, Section II)
before you use the equipment. Also perform the lubrication instructions, contained in paragraphs
3-2, and 3-3 before operating equipment. Damage to equipment could result if these
maintenance services are not done.
(1) The Model CN3115R sewing machine is set up to use standard type 16 x 87 needles in
sizes ranging from 11 to 22. Select the needle of the correct size, class and variety from the
Component of End Item (COEI) List of Appendix C of this manual.
(2) The thickness of the sewing thread, which must pass through the eye of the needle,
determines the size of the needle.
Uneven, knotted or rough thread impairs the satisfactory sewing performance of your machine.
LEFT TWIST THREAD
(3) Use left twist thread only in the needle. To test for twist hold a length of thread between
thumbs and index fingers of your hands. Turn thread counterclockwise, if it will twist
tighter, it has a left twist. If it unravels it has a right twist. The bobbin can be wound with
either left or right twist thread.