2-13. OPERATING PROCEDURES FOR BUTTON 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 paragraph 3-2 and 3-4, before operating equipment.
Damage to equipment could result if these maintenance services are not done.
a. Selecting Needle.
(1) The Model 261-2 Button machine is set up to use standard type 175 x 7 needles in sizes ranging
from 16 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
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.