Featherweight Sewing Machine. Now check the chart below. Ask Question Asked 1 year, 6 months ago. The following details are believed to be correct, and are provided in good faith, but you should always check the information for yourself before buying new bobbins, or using a type you have not used in the machine before. Active 1 year, 6 months ago. Bobbin Selection By Model. Using a thinner thread size means more thread per bobbin, and fewer change ups. Saved from s-media-cache-ak0.pinimg.com. If two sizes fit, go for the bigger. Superior Blog View Our Blog 0: Search Site. INFOGRAPHIC; L-STYLE ; M-STYLE; Class 15; Learn About Sewing Machine Bobbins. If you are using a heavyweight thread just for looks, then the bobbin thread might be two or three sizes smaller. Superior Education BOBBIN SHAPES AND STYLES . Generally, the bobbin thread should be one size smaller than the top-stitch thread - for example a Size 138 top-stitch would normally use a Size 92 bobbin thread. Wind thread on empty bobbins only – don’t wind additional thread onto partially wound bobbins, as this can cause stitch irregularities when you sew. View All. Viewed 246 times 1 \$\begingroup\$ I have to design a 150 Ampere, 1.5 mH Inductor for a power supply project assigned to me, and off-the-shelf components are to be used. BOBBIN CALCULATOR. Utilization of bobbin ( spool or drum) cores is a simple and cost effective way of designing a power inductor. Bobbin Tips & Hints Use only bobbins that are the same class/style as those that come with your machine – don’t substitute! Bobbins are one of the four necessary components for sewing. Size Guide: Kids Bikes Finding the correct size bike starts with measuring the legs. This calculator makes use of standard bobbins in Fair-Rite's # 77 material - so frequency is limited to about 10 MHz, depending on the winding. It will fit for longer whilst your child grows. 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