(a)
(c)
(2)
(1) 
(b)
3-Thread Overlock Balanced tension
(a)(a) The needle thread should resemble straight stitches to the left of the fabric edge on the topside (1) of the
(c)fabric. The needle thread is barely visible in the lower looper thread on the underside (2) of the fabric.
(b)The upper looper thread should lie flat on the topside of the fabric and lock with the lower looper thread on the edge of the fabric.
(c)The lower looper thread should lie flat on the underside of the fabric and lock with the upper looper thread on the edge of the fabric.
The upper looper thread is too loose.
If the upper looper thread (b) is loose and pulled down to the underside of the fabric, increase the upper looper thread tension (red) and/or decrease the lower looper thread tension (green).
(b)
(a)
The needle thread is too loose.
If the needle thread (a) is too loose and clearly visible on the underside of the fabric, increase the needle thread tension (yellow) and/or decrease either or both looper thread tensions.
(c)
The lower looper thread is too loose.
If the lower looper thread (c) is loose and pulled up onto the topside of the fabric, increase the lower looper thread tension (green) and/or decrease the upper
looper thread tension (red).
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