{"id":2291,"date":"2026-09-03T12:12:00","date_gmt":"2026-09-03T11:12:00","guid":{"rendered":"https:\/\/www.amann.education\/?p=2291"},"modified":"2026-09-08T08:08:00","modified_gmt":"2026-09-08T07:08:00","slug":"stitch-types-and-thread-consumption","status":"publish","type":"post","link":"https:\/\/www.amann.education\/?p=2291","title":{"rendered":"Stitch Types and Thread Consumption"},"content":{"rendered":"\n\n\n

A cover chainstitch takes ten times the thread of a lockstitch. LN-025 makes thread consumption a calculation, not an argument.<\/p>\n\n\n\n

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Introduction<\/h2>\n\n\n\n

Ask three people in a factory how much thread a jacket takes, and you get three answers: a figure per garment in purchasing, a machine setting in the sewing room, a number on the costing sheet nobody can trace. As long as the order covers the run, the three never meet. When it runs short, they meet in a room \u2014 and the conversation is rarely about thread. It is about a specification that was never written down completely.<\/p>\n\n\n\n

Three numbers, not one<\/h2>\n\n\n\n

A seam is defined by three. The stitch type says how the threads interlace. The seam type says how the plies are assembled, and with that how many rows of stitching a metre of seam carries. The stitch density says how often the interlacing repeats along that metre.<\/p>\n\n\n\n

All three move the thread requirement; the first moves it hardest. At four stitches per centimetre on 1 mm material, AMANN’s published figures give a lockstitch 2.62 metres of thread per metre of seam and a four-needle flatseam 27.18 \u2014 10.4 times as much, decided before anyone has chosen a product, a ticket number or a supplier. It is also the number the customer is least likely to mention when asking what the thread will cost.<\/p>\n\n\n\n

Why the figures never quite agree<\/h2>\n\n\n\n

Thread is spent in two places, and only one of them cares about density. Part of it runs the length of the seam: every thread that goes end to end costs at least a metre per metre of seam, whether the stitches sit close together or far apart. The rest is spent at each individual stitch \u2014 crossing the material, forming the interlacing, and in overlock and cover stitches wrapping the edge or covering the surface. That part is paid once per stitch, so it rises with the stitch density and with the thickness of what is being sewn.<\/p>\n\n\n\n

A published figure is therefore not a constant. It is the output of a calculation at one stitch density, one material thickness, one number of plies. Change any of the three and the figure changes with it. Two reputable sources can print different numbers for the same stitch type and both be right; the way to tell is to compare the conditions printed underneath them, not the numbers. A figure quoted without its conditions cannot be checked \u2014 and cannot be defended in front of a customer who has one of their own.<\/p>\n\n\n\n

What the module does with that<\/h2>\n\n\n\n

LN-025 turns the relationship into arithmetic. It works from AMANN’s published thread requirement for nineteen stitch types at two stitch densities, with the conditions AMANN prints alongside them, and from AMANN’s split of that requirement into needle, looper and cover thread. The split matters more than it sounds: on a three-thread overlock the loopers carry 88 per cent of the thread. Cost that seam on the needle thread alone and the result is out by a factor of eight \u2014 and the customer will be certain the invoice is wrong.<\/p>\n\n\n\n

From there the module builds five steps that produce a figure anyone in the room can follow, and a worked example worth remembering: a jacket with twelve metres of seam consumes a little over a hundred metres of thread. Step two \u2014 measure the stitch density on the finished part instead of trusting the specification \u2014 settles a large share of consumption disputes before step three is reached.<\/p>\n\n\n\n

Density is a decision, not a setting<\/h2>\n\n\n\n

Stitch density is usually treated as something the sewing room owns. It is a specification parameter with three effects that pull against each other, and a customer almost never hears them together.<\/p>\n\n\n\n