3-Thread Flatlock Narrow (RN)

Upper looper thread (blue) extends over the fabric edge towards the bottom.

  1. Reduce the RN thread tension (green).
  2. Increase the UL thread tension (blue).

Upper looper thread (blue) doesn't reach the fabric edge.

  1. Reduce the UL thread tension (blue).
  2. Increase the RN thread tension (green).

Lower looper thread (red) not straight along the fabric edge.

  1. Increase the LL thread tension (red).
  2. Reduce the RN thread tension (green).
  3. Reduce the UL thread tension (blue).

The seam puckers. Lower looper thread (red) too tight.

  1. Reduce the LL thread tension (red).

Needle thread (green) doesn't reach the fabric edge.

  1. Reduce the RN thread tension (green).
  2. Increase the UL thread tension (blue).
  3. Increase the LL thread tension (red).

Needle thread (green) extends over the fabric edge to the top.

  1. Reduce the UL thread tension (blue).
  2. Increase the RN thread tension (green).

The fabric edge forms a tunnel or rolls up.

  1. Reduce the RN thread tension (green).
  2. Reduce the UL thread tension (blue).
  3. Increase the Micro Thread Control (mtc)
  4. Reduce the cutting width CW.
  5. Check the rolled hem lever N/R position.