TM 10-3530-207-14
2-12. OPERATING PROCEDURES FOR DARNING SEWING MACHINE .
CAUTION
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 3-5, before operating equipment. Damage to equipment could result if these
maintenance services are not done.
a.
Selecting Needle.
(1) The Model 207 DARNING machine is set up to use standard type 126 x 3 needles in sizes
ranging from 10 to 24. 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.
NOTE
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.
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