Skipped Stitches on Georgette: Machine Set-Up Under Time Pressure
In the workshop of a government-aided sewing centre, a first-year trainee is hemming six polyester georgette dupattas on a hand-operated straight-stitch machine. An hour earlier the same machine sewed a cotton poplin sample perfectly with a 90/14 needle, 40s cotton thread and the top tension dial at 4. On the georgette the stitches now skip every 4–5 cm, small loops of thread appear on the underside, one needle has already bent, and the hem edge puckers. The cupboard holds only 70/10, 80/12, 90/14 and 100/16 needles, 40s cotton and 60s polyester thread, and one screwdriver. The electrician is away, the flex near the plug is repaired with cello tape, and the trainee works with loose hair and open sandals because 'it is only a hand machine'. The supervisor wants all six dupattas finished before the centre closes in two hours.
1. In what order would you correct the stitching faults, and why is that order better than simply turning the tension dial?
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Safety first, then one variable at a time. The order is:
- Stop and make the machine safe - the taped flex is a shock and fire risk; no stitching is worth it.
- Fit a new needle of the correct size and type. A bent or blunt needle deflects as it enters the fabric, so the hook misses the loop and the stitch skips. Changing tension while a bent needle is in place only hides the fault.
- Clean and re-thread - remove lint from the bobbin case and race, check that the bobbin is wound evenly and inserted the right way, and re-thread with the presser foot up so the thread sits inside the discs.
- Match needle and thread to the fabric (next task).
- Balance tension last, on a double-folded scrap of the same georgette.
- Adjust presser-foot pressure and stitch length, then sew the hems.
Reasoning: skipped stitches and loops have different causes. Skipping points to needle/hook/timing; loops on the underside point to the top thread. Fixing the mechanical cause first means the tension you set is the tension you keep.
2. State the exact needle, thread, tension and pressure changes you would make, justifying each by the behaviour of polyester georgette.
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Needle: fit 70/10, or 80/12 if the 70/10 deflects on the hem folds. Georgette is a fine, slippery, firm-twist polyester. A 90/14 needle makes a hole bigger than the thread, so the hook cannot form a clean loop and stitches skip; it also leaves visible needle marks and a puckered hem. Use a sharp point, not a ball point.
Thread: use 60s polyester, not 40s cotton. The finer thread passes through the small eye without shredding, matches the low bulk of the fabric, and its slight stretch behaves like the polyester fabric. Cotton thread on polyester abrades and breaks at the needle eye.
Tension: loops under the fabric mean the top thread is too loose, so the dial number must go up, not down - but only after the needle and thread are correct. With finer thread, start near the previous setting (4) and raise in half-step increments until the loops disappear and the knot sits inside the two layers.
Pressure and stitch length: reduce presser-foot pressure so the fine fabric is not stretched ahead of the needle (stretching causes puckering and wavy hems); shorten the stitch to about 1.5–2 mm. Test each change on a scrap of the same fabric before touching the dupattas.
3. Identify the safety hazards in the setup and give the cheapest acceptable correction for each, naming the one that must be corrected before the machine runs again.
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Hazards and fixes:
- Flex repaired with cello tape. Cello tape is not an electrical insulator; it dries, slips and leaves live conductor exposed. Cheapest acceptable fix: switch off at the socket, replace the plug/flex or wrap only the damaged core with proper PVC insulation tape as a stop-gap, and get the lead replaced by an electrician before regular use. This is the non-negotiable item: the machine does not run until it is done, because the trainee's hands sit on a metal machine body.
- Loose hair. Tie it back or cover it; a hand wheel and belt will catch long hair. Cost: zero.
- Open sandals. Closed footwear, or at minimum keep feet clear of the treadle and any dropped pins. Low cost.
- Housekeeping. Keep shears, pins and the screwdriver in a tray, not on the machine bed, where vibration walks them under the needle; never place fingers near the needle while the machine is in motion; unplug before changing needles; keep the workspace dry.
Reasoning to record: the wiring fault is a hazard to life, while hair and footwear are hazards of injury. Life-threatening hazards are corrected before production, not after.