Fundamentals of Clothing Construction

FUNDAMENTALS OF CLOTHING CONSTRUCTION 3(1+2)

Lesson 4 : Sewing Adjustment for Defects

Lower Thread Breaking

• Improper threading of bobbin in bobbin case.
• Tension too tight.
• Thread wound unevenly or bobbin wound too full.
• Spring on bobbin case worn to sharp groove.
• Burr on underside of throat plate.
• Knot in bobbin thread.
• Lint, dirt, or thread under tension spring of bobbin case.

Remedies:

• Rethread the bobbin case.
• Adjust the tension of thread.
• Wind the bobbin evenly.
• Clean the bobbin case and shuttle.