SECTION | 4. | PERFORMANCE | PROBLEMS CHART |
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What to Do When |
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| PROBLEM |
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| PROBABLE | CAUSE |
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| CORRECTION |
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| Incorrect | size needle, |
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| Choose | correct |
| size | needle | for | thread | and | fabric, |
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| Improper | threading, |
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| Rethread | machine, |
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| Loose | upper | thread | tension. |
| Tighten | upper | thread | tension. |
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Irregular | Stitches | Pulling | fabric. |
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| Do not |
| pull | fabric; | guide | it | gently. |
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| Loose | presser | foot, |
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| Reset | presser | foot. |
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| Unevenly | wound | bobbin, |
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| Rewind |
| bobbin. |
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| Nicks or burrs at hole of needle plate. | Replace | needle |
| plate, | or | polish |
| off | burrs | completely. |
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| Pulling | fabric. |
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| Do not |
| pull | fabric; | guide | it | gently. |
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| Incorrect | size | needle. |
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| Choose |
| correct |
| size | needle | for | thread | and | fabric. |
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Breaking | Needle | Incorrect | setting | of | needle. |
| Reset | needle. |
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| Loose | presser | foot. |
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| Reset | presser | foot. |
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| Upper | and | lower | threads | not drawn | back | When | starting | a seam | be | sure to | draw | both |
| threads | under | and | ||||||||||
Bunching | of | Thread | under | presser | foot |
| before | starting | seam. | back of | presser | foot | about | 4" | and | hold | until | a few | stitchs | are | |||||||||
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| formed. |
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| Incorrect | thread | tension(s). |
| Reset | thread | tension(s). |
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| Using two different | sizes or kinds of thread. | Upper | thread | and bobbin | thread | should | be | same size and | kind, | |||||||||||||||||
Puckering |
| Bent or blunt needle. |
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| Insert | new | needle. |
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| Loose presser foot. |
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| Reset | presser | foot. |
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| Fabric very sheer or very soft. |
| Use underlay | of | tissue | paper. |
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36
