Pfaff 72 Owner's Manual - Page 11
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Types of Fabri. cs Hercerize Si.lk Needle Cotton Size Fine Fabrics such as georgette, chiffon, batiste, voile, lawn, silk. 80 0 60 to or 100 twist 70 Lightweight Fabrics such as dress silks and cottons, sheer woolens, shirting, dra- 70 to A&B twist 80 peries. 80 Medium Fabrics such as lightweight woolens, madras, muslin, brocades, heavy silks and rayon, gabardine. 50 & to twis 90 70 Heavy Fabrics such as coating, denim, corduroy, slipcover fabrics, bed tickings, lightweight canvas. 40 c&D 100 to twist 50 Very Heavy Fabrics such as heavy tickings, canvas, overcoating, sailcloth, upholstery Synthetics, Rayon, Acetate including nylon, orion, dacron, plastics, etc. 24 90 to E to 40 twist 110 Determined by weight of fabric 40 to 50 Determined threal size 60 to 80 Recommended Needle and Thread Sizes The appearance of the finished seam is dependent on the correct relationship between needle, thread and fabric. Select the proper thread sizes and needles from this chart. The same size threads should be used in the needle and on the bobbin. Some experienced seamstresses prefer a somewhat thinner bobbin thread. However, the bobbin thread never should be thicker than the needle thread. For embroidery and darning work, a No. 50 thread should normally be used. 12