LOWER THREAD BREAKING :---

1.Poor thread .

2.Lower tension too tight .


3.Bobbin case threaded wrongly .

4.Sharp edge on needle plate .

5.Bobbin wound too full or uneven .

6. Dirt in bobbin case .

FABRIC PUCKERING :---

1. ONE OR BOTH TENSIONS TOO TIGHT .

2. STITCH TOO LONG FOR MATERIAL BEING SEWN .

3. BLUNT NEEDLE .

NEEDLE BREAKING :--

1.Incorrect size of needle for thread and fabric .

2.Needle blunt .

3.Pulling of material while stitching .

4.Presser foot incorrectly set .

5 .Crossing a thick seam using too small needle .

STAGGERED STITCHES :---

1.Too little pressure on presser foot .

2.Take up spring weak ,broken or missing .

UNEVEN STITCH LENGTH :---

1.Incorrect presser foot pressure .

2.Feed dog dirty or worn out .