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Textile Costing · Lecture 15
Review of Spinning Calculations
Count, ounces per spindle, bags per frame, cotton cost per lb and the adjusted cost of carded and combed yarn — the mid-term review.
OPSBags per frameYieldCombed vs carded
Production of a ring frame
Spinning production is quoted as OPS — ounces per spindle per shift — which falls steeply as the count gets finer. A frame of 480 spindles at 1 OPS makes 480 oz a shift, 1,440 oz a day (three shifts), which is 0.9 bags of 100 lb. Multiply by the OPS of the count being spun to get bags per frame per day.
| A | B | C | D | E | |
|---|---|---|---|---|---|
| 1 | Count | OPS | |||
| 2 | Spindles per frame | 6 | 28.5 | ||
| 3 | Shifts per day | 7 | 28 | ||
| 4 | Ounces per shift at 1 OPS | 480 | 8 | 27 | |
| 5 | Ounces per day at 1 OPS | 1,440 | 10 | 22 | |
| 6 | Bags per frame at 1 OPS (÷16 oz ÷100 lb) | 0.90 | 12 | 17 | |
| 7 | OPS for the count spun | 14 | 14.5 | ||
| 8 | Bags per frame per day | 25.20 | 16 | 13.3 | |
| 9 | 18 | 11 | |||
| 10 | 20 | 10.3 | |||
| 11 | 20 CM | 10.5 | |||
| 12 | 24 | 8 | |||
| 13 | 26 | 7.5 | |||
| 14 | 30 | 5.5 | |||
| 15 | 40 CM | 4.15 | |||
| 16 | 50 CM | 3.5 | |||
| 17 | 60 CM | 2.6 | |||
| 18 | 80 CM | 1.7 | |||
| 19 | 100 CM | 1.1 | |||
| 20 | 120 CM | 0.9 |
blue = input (edit me)grey = formula (click to see it)OPS table on the right (CM = combed).
Cotton cost per lb of yarn
Cotton is bought per maund (37.34 kg). Only part of it becomes yarn — the yield — and the waste is sold for a fraction of the cotton price. Combed yarn gives up a further 8% as noil, which sells well.
| A | B | ||
|---|---|---|---|
| 1 | Cotton price per maund (Rs) | ||
| 2 | kg per maund | ||
| 3 | Cotton cost per lb | 34.023 | |
| 4 | Carded yarn | ||
| 5 | Yield | ||
| 6 | Cotton cost per lb of yarn (before waste credit) | 41.491 | |
| 7 | Proceeds on waste (fraction of cotton price) | ||
| 8 | Rupee value of waste per lb of yarn | 0.919 | |
| 9 | Adjusted cotton cost — carded | 40.573 | |
| 10 | Combed yarn | ||
| 11 | Yield | ||
| 12 | Cotton cost per lb of yarn | 45.977 | |
| 13 | Waste % | ||
| 14 | Proceeds on waste | ||
| 15 | Rupee value of waste | 0.919 | |
| 16 | Noil % (1 − yield − waste) | 8.0% | |
| 17 | Proceeds on noil | ||
| 18 | Rupee value of noil | 1.905 | |
| 19 | Adjusted cotton cost — combed | 43.153 | |
blue = input (edit me)grey = formula (click to see it)
A subtle point in the original worksheet: the carded formula credits waste on (1 − yield) while the combed formula separates waste and noil, because noil is worth far more than ordinary waste. Always ask what each by-product sells for.