Bernina Aurora 440QE User Guide - Page 18
Important facts about thread and needle - stitches
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18 Important facts about thread and needles Important facts about thread and needle With the right combination of thread and needle optimum sewing results are achieved. The following are the guidelines: replace needle when starting a new sewing project. Thread The thread is chosen according to use. For a perfect sewing result, thread and material quality play an important role. It is recommended to use quality brand threads. Cotton thread • cotton threads are particularly suitable for cotton fabrics • mercerized cotton threads have a slight sheen Polyester thread • polyester thread is suitable for practically all sewing needs • it has a high tensile strength and is particularly colorfast • polyester thread is more flexible and is recommended where a strong and elastic seam is required Needle, thread and fabric The correct needle size depends on the selected thread and fabric. Fabric type and structure determine which thread weight, needle size and needle tip should be used. Needle summary BERNINA requires needle system 130/705 H. This system number refers to shank shape as well as to length and form of the needle point. Checking the needle condition The needle condition should be checked and the needle replaced regularly. A defective needle not only damages the fabric but also the sewing computer. Guidelines lightweight fabrics: thin thread (darning thread, embroidery thread) mediumweight fabrics: normal sewing thread heavyweight fabrics: sewing thread (quilting thread, topstitching thread) Needle No. 70-75 80-90 100, 110, 120 130 / 705 H S 70 Shank diameter = 0.7 mm (needle size) Needle point e.g. medium ball point Needle scarf Flat shank Shank length Needle/thread combination In order to check the needle/thread compatibility, the correct size thread must correspond with the correct size needle. Correct needle/thread combination When sewing, the thread should travel smoothly down the long groove on the front of the needle. Too thin thread or too thick needle The sewing thread has too much play in the groove. This could lead to skipped stitches and damage to the thread. Too thick thread or too fine needle The thread rubs on the edges of the groove and can get jammed. This can break the thread. 032907.52.04_1103_a430_a440_a450_EN