By the end of this chapter, you will be able to:
Mastering these troubleshooting skills helps you keep sewing machines running smoothly, saving time and ensuring quality work in your trade.
The sewing machine, despite its mechanical robustness, is prone to a variety of faults that can disrupt the workflow in fashion design studios or tailoring shops. Understanding these common faults helps technicians and fashion designers anticipate problems and respond promptly. In Kenya, where many small to medium enterprises rely on single or limited machines, recognizing these faults is vital to avoid costly delays in meeting client orders.
Needle breakage is a frequent fault that compromises sewing quality and machine safety. This can occur due to various causes such as using the wrong needle type for the fabric, incorrect needle installation, or sewing over pins and thick seams. For example, at a boutique in Nairobi specializing in bridal wear, frequent needle breakage was traced to using universal needles on heavy brocade fabric instead of denim needles, which are more robust. Improper needle alignment or a bent needle can also cause damage, leading to skipped stitches or fabric damage.
Thread jams disrupt the stitching process and can cause machine stoppage. This fault arises when the thread is improperly threaded through the machine, tension settings are incorrect, or the bobbin is inserted incorrectly. In a Kisumu tailoring workshop, persistent thread tangling was resolved by retraining operators on correct threading paths and regularly cleaning the bobbin case to remove lint buildup. Using low-quality thread can also increase the likelihood of tangling due to inconsistent thread thickness and strength.
Uneven or skipped stitches significantly affect garment appearance and durability. This fault may result from a dull or bent needle, incorrect tension settings, or a damaged feed dog mechanism. For instance, a garment manufacturer in Mombasa noticed skipped stitches when sewing stretch fabrics because the feed dogs were not properly engaging the fabric, requiring adjustment or replacement. Stitch length and width settings that do not match the fabric type also contribute to inconsistent stitching.
Electric sewing machines depend on motors and electrical components that can fail due to wear, overheating, or power surges. In county government tailoring units, frequent power fluctuations led to motor burnout, causing costly repairs. Symptoms include the machine not starting, sudden stops during operation, or unusual noises indicating motor strain. Overloading the machine by sewing excessively thick materials without proper settings also stresses the motor.
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Create a free accountThis chapter explored the common faults encountered in sewing machines, highlighting typical issues that can disrupt smooth operation. It then examined effective remedies, starting with fault finding techniques that enable operators to accurately identify the root causes of problems. The discussion progressed to fault solving methods, detailing practical steps to restore the machine to proper working condition. Additionally, the chapter reviewed essential tools and supplies used in troubleshooting, emphasizing their role in efficient maintenance and repair. Understanding these aspects equips learners with the skills to maintain sewing machines, minimize downtime, and ensure consistent performance. The integrated approach of identifying, diagnosing, and correcting faults forms the foundation of competent sewing machine operation.
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Screwdrivers (assorted sizes) | Machine needle (size 14) |
| Lint brush | Bobbin and bobbin case |
| Tweezers | Medium weight fabric (40 cm x 40 cm) |
| Machine oil | Assorted sewing threads (contrasting colour) |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Straight stitch sewing machine | 1 Pc per Candidate |
| 2 | Screwdrivers (assorted sizes) | 2 Pcs per Candidate |
| 3 | Lint brush | 1 Pc per Candidate |
| 4 | Tweezers | 1 Pc per Candidate |
| 5 | Machine oil | 100 ml per Candidate |
| 6 | Machine needle (size 14) | 1 Pc per Candidate |
| 7 | Bobbin and bobbin case | 1 Pc per Candidate |
| 8 | Medium weight fabric (40 cm x 40 cm) | 1 Pc per Candidate |
| 9 | Assorted sewing threads (contrasting colour) | 1 Reel per Candidate |
| 10 | Hand gloves | 1 Set per Candidate |
| 11 | Dust coat | 1 Pc per Candidate |
| 12 | Low heeled closed shoes | 1 Pair per Candidate |
| 13 | A4 envelope | 1 Pc per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Identify and use personal protective equipment (PPE) | |||
| Candidate identifies and wears dust coat (Award 1 mark for correct use) | 1 | ||
| Candidate wears hand gloves (Award 1 mark for correct use) | 1 | ||
| Candidate wears low heeled closed shoes (Award 1 mark for correct use) | 1 | ||
| Sub-Total | 3 | ||
| TASK 2: Prepare and inspect tools and equipment | |||
| Candidate identifies and obtains sewing machine and tools (Award 1 mark) | 1 | ||
| Candidate checks needle type for suitability (Award 1 mark) | 1 | ||
| Candidate checks bobbin and bobbin case are correct and functional (Award 1 mark) | 1 | ||
| Sub-Total | 3 | ||
| TASK 3: Inspect sewing machine for faults | |||
| Candidate inspects needle for bending, bluntness, or incorrect insertion (Award 2 marks for correct identification) | 2 | ||
| Candidate checks thread tension discs for dirt or incorrect setting (Award 2 marks for correct identification) | 2 | ||
| Candidate inspects bobbin and bobbin case for damage or incorrect positioning (Award 2 marks for correct identification) | 2 | ||
| Candidate checks feed dog for lint accumulation or damage (Award 2 marks for correct identification) | 2 | ||
| Candidate inspects presser foot for correct pressure and alignment (Award 2 marks for correct identification) | 2 | ||
| Candidate identifies any oil leakage or lack of lubrication points (Award 2 marks for correct identification) | 2 | ||
| Sub-Total | 12 | ||
| TASK 4: List causes and remedies for identified faults | |||
| Candidate lists causes for each fault identified (Award 1 mark per correctly matched cause, max 5) | 5 | ||
| Candidate lists appropriate remedies for each fault (Award 1 mark per correctly matched remedy, max 5) | 5 | ||
| Sub-Total | 10 | ||
| TASK 5: Clean and oil the sewing machine as part of troubleshooting | |||
| Candidate powers off and disconnects machine (Award 1 mark) | 1 | ||
| Candidate removes needle and presser foot (Award 1 mark) | 1 | ||
| Candidate cleans bobbin area and feed dog removing lint and debris (Award 2 marks) | 2 | ||
| Candidate applies machine oil to correct oiling points (needle bar, shuttle race, presser foot joints) (Award 1 mark per correctly oiled point, max 3) | 3 | ||
| Candidate wipes off excess oil and reassembles machine (Award 2 marks) | 2 | ||
| Sub-Total | 9 | ||
| TASK 6: Test machine operation after troubleshooting | |||
| Candidate threads the machine correctly (Award 2 marks) | 2 | ||
| Candidate stitches a straight line on provided fabric (Award 2 marks) | 2 | ||
| Candidate identifies if faults persist or are resolved (Award 2 marks) | 2 | ||
| Sub-Total | 6 | ||
| TASK 7: Clean work station and package documentation | |||
| Candidate cleans work area and disposes waste properly (Award 2 marks) | 2 | ||
| Candidate packages fault identification list in A4 envelope with proper labeling (Award 2 marks) | 2 | ||
| Sub-Total | 4 | ||
| PRODUCT CHECKLIST | |||
| Fault identification list with at least five common faults correctly named (Award 2 marks for minimum 5 faults named, 2 marks for correct causes and remedies) | 4 | ||
| Cleaned and oiled sewing machine showing no lint or dirt (Award 3 marks) | 3 | ||
| Machine produces consistent straight stitches on test fabric (Award 3 marks) | 3 | ||
| Sub-Total | 10 | ||
| GRAND TOTAL | 57 | ||
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Assorted screwdrivers | Straight stitch sewing machine |
| Tweezers | Machine needles (size 14) |
| Lint brush | Bobbin and bobbin case |
| Cutting shears | Machine thread (contrast colour) |
| Tailors chalk | Medium weight fabric (30 cm x 30 cm) |
| Machine oil (100 ml) | |
| Hand gloves | |
| Dust coat | |
| Low heeled closed shoes |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Straight stitch sewing machine | 1 pc per Candidate |
| 2 | Machine needles (size 14) | 2 pcs per Candidate |
| 3 | Assorted screwdrivers | 2 pcs per Candidate |
| 4 | Lint brush (various sizes) | 1 pc per Candidate |
| 5 | Tweezers | 1 pc per Candidate |
| 6 | Machine oil (100 ml) | 100 ml per Candidate |
| 7 | Bobbin and bobbin case | 1 set per Candidate |
| 8 | Medium weight fabric (30 cm x 30 cm) | 2 pcs per Candidate |
| 9 | Machine thread (contrast colour) | 1 reel per Candidate |
| 10 | Hand gloves | 1 set per Candidate |
| 11 | Dust coat | 1 pc per Candidate |
| 12 | Low heeled closed shoes | 1 pair per Candidate |
| 13 | Tailors chalk | 1 pc per Candidate |
| 14 | Cutting shears | 1 pc per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Personal Protective Equipment and Workshop Preparation | |||
| Identified and wore PPE correctly: dust coat, hand gloves, low heeled closed shoes (Award 1 mark each) | 3 | ||
| Ensured well-ventilated and adequately lit workspace (Award 2 marks) | 2 | ||
| Gathered all necessary tools and materials before starting (Award 2 marks) | 2 | ||
| Sub-Total | 7 | ||
| TASK 2: Inspection and Preparation of the Sewing Machine | |||
| Turned off and unplugged the sewing machine before inspection (Award 1 mark) | 1 | ||
| Removed needle and presser foot carefully (Award 2 marks) | 2 | ||
| Opened bobbin cover and removed bobbin and bobbin case (Award 2 marks) | 2 | ||
| Used lint brush and tweezers to clean lint and threads from shuttle and feed dog areas (Award 3 marks) | 3 | ||
| Wiped down exterior surfaces of the machine (Award 1 mark) | 1 | ||
| Reassembled needle, presser foot, bobbin and bobbin case correctly (Award 2 marks) | 2 | ||
| Sub-Total | 11 | ||
| TASK 3: Oiling and Lubrication | |||
| Turned off and unplugged machine before oiling (Award 1 mark) | 1 | ||
| Located all oiling points: bobbin area, needle bar, presser foot lever joints, hand wheel shaft (Award 1 mark each) | 4 | ||
| Applied appropriate machine oil to all oiling points (Award 4 marks) | 4 | ||
| Manually rotated hand wheel to distribute oil (Award 2 marks) | 2 | ||
| Wiped off excess oil to prevent fabric staining (Award 1 mark) | 1 | ||
| Sub-Total | 12 | ||
| TASK 4: Threading and Testing the Sewing Machine | |||
| Wound bobbin and inserted it correctly into bobbin case (Award 3 marks) | 3 | ||
| Threaded the machine correctly following thread guides, tension discs, take-up lever and needle eye (Award 6 marks) | 6 | ||
| Tested the machine by stitching on provided fabric (Award 3 marks) | 3 | ||
| Identified and diagnosed fault based on stitch test results (e.g., thread breakage, skipped stitches, puckering) (Award 4 marks) | 4 | ||
| Recommended and performed appropriate adjustments to correct the fault (Award 6 marks) | 6 | ||
| Sub-Total | 22 | ||
| TASK 5: Final Clean-up and Reporting | |||
| Turned off machine and unplugged after testing (Award 1 mark) | 1 | ||
| Cleaned work area and disposed of waste as per workplace policy (Award 2 marks) | 2 | ||
| Covered machine and arranged tools neatly (Award 1 mark) | 1 | ||
| Completed a brief written report on fault diagnosis and corrective actions taken (Award 3 marks) | 3 | ||
| Sub-Total | 7 | ||
| PRODUCT CHECKLIST | |||
| Correct identification of sewing machine fault(s) based on stitching test (Award 4 marks) | 4 | ||
| Proper functioning of sewing machine after adjustments (smooth stitching with no skipped stitches or thread breakage) (Award 6 marks) | 6 | ||
| Clean and reassembled machine with no missing parts (Award 3 marks) | 3 | ||
| Neatly prepared fault diagnosis report with clear recommendations (Award 3 marks) | 3 | ||
| Sub-Total | 16 | ||
| GRAND TOTAL | 75 | ||
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