TROUBLE SHOOTING GUIDE

Simthread collect some of the problems of sewing and embroidery, causes and corrections for your reference. 

Problem  Cause  Correction
Upper thread
breaks
1. The machine is not threaded correctly.
2. The thread tension is too tight.
3. The thread is too thick for the needle.
4. The needle is not inserted correctly.
5. The thread is wound around the spool
holder pin.
6. The needle is damaged.
1. Rethread the machine.
2. Reduce the thread tension. (lower
number)
3. Select a larger needle.
4. Remove and reinsert the needle. (Àat
side towards the back)
5. Remove the spool and wind thread
onto spool.
6. Replace the needle.
Lower thread
breaks
1. The bobbin case is not inserted
correctly.
2. The bobbin case is threaded wrong.
3. The lower thread tension is too tight.
1. Remove and reinsert the bobbin case
and pull on the thread. The thread should
pull easily.
2. Check both bobbin and bobbin case.
3. Loosen lower thread tension as
described.
Skipped stitches  1. The needle is not inserted correctly.
2. The needle is damaged.
3. The wrong size or type of needle has
been used.
4. The foot is not attached correctly.
1. Remove and reinsert needle. (Àat side
towards the back)
2. Insert a new needle.
3. Choose a needle to suit the thread and
fabric.
4. Check and attach correctly.
Needle breaks  1. The needle is damaged.
2. The needle is not correctly inserted.
3. Wrong needle size for the fabric.
4. The wrong foot is attached.
1. Insert a new needle
2. Insert the needle correctly. (Àat side
towards the back)
3. Choose a needle to suit the thread and
fabric.
4. Select the correct foot.
Loose stitches  1. The machine is not correctly threaded.
2. The bobbin case is not correctly
threaded.
3. Needle/ fabric/ thread combination is
wrong.
4. Thread tension wrong.
1. Check the threading.
2. Thread the bobbin case as illustrated.
3. The needle size must suit the fabric
and thread.
4. Correct the thread tension.
Seams gather
or pucker
1. The needle is too thick for the fabric.
2. The stitch length is incorrectly adjusted.
3. The thread tension is too tight.
1. Select a ¿ner needle.
2. Shorten the stitch length.
3. Loosen the thread tension.
Uneven stitches,
uneven feed
1. Poor quality thread.
2. The bobbin case is incorrectly
threaded.
3. Fabric has been pulled.
1. Select a better quality thread.
2. Remove bobbin case, thread and insert
correctly.
3. Do not pull on the fabric while sewing,
let it be moved up by the feed dogs.
The machine
is noisy
1. The machine must be lubricated.
2. Lint or oil have collected on the hook or
needle bar.
3. Poor quality oil has been used.
4. The needle is damaged.
1. Lubricate as described.
2. Clean the hook and feed dog as
described.
3. Only use good quality sewing machine
oil.
4. Replace the needle.
The machine
jams
Thread is caught in the hook.  Remove the upper thread and bobbin
case, turn the handwheel backwards and
forwards by hand and remove the thread.
Lubricate as described.

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