30. CAUSES OF COMMON DIFFICULTIES
NOTE: Clean and oil machine at regular intervals.
A. Machine Makes Noise
1. Thread jammed in race assembly. (Clean and oil shuttle)
2. Blunt needle.
3. Needle plate not placed in properly.
4. Slide plate not all the way to the right.
B. BREAKING UPPER THREAD
1. Incorrect threading.
2. Upper thread tension too tight.
3. Lower thread tension too tight.
4. Fautly needle, or needle placed incorrectly.
5. Needle brushing against presser toot of other attachments.
6. Needle eye too small for thread used
7. Starting the machine suddenly or with a jerk.
8. Starting the machine with the take up lever at its highest point.
9. Presser bar not lowered.
10. Thread jammed in race assembly. (Clean)
C. BREAKING THE LOWER THREAD.
1. Incorrect threading of the bobbin case.
2. Lower thread tension too tight.
3. Bobbin wound too full or improperly.
1. Rough edge in hole of needle platé.
D. BREAKING THE NEEDLE
1. Pulling or holding the fabric while machine is running.
2. Using bent needle.
3. Needle not set in securely. (Tighten needle clamp screw with screw driver)
E. SKIPPING STITCHES
1. Using bent or blunt needles.
2. Needle inserted incorrectly.
3. Needle threaded improperly.
4. Using wrong size needle. (Length-Use 15x1 needle)
5. Pressure of presser foot insufficient, especially when sewing heavy material.
F. UNEVEN STITCHES
1. Presser foot not resting evenly on material.
2. Fabric feeders not high enough.
3. Stitches too short.
4. Pulling or holding the cloth while machine is running
5. Using too fine a needle with too coarse a thread.
6. Upper and lower thread tensions not adjusted properly.
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