DonInReno Posted January 13, 2023 Report Posted January 13, 2023 On 1/5/2023 at 1:29 PM, Clothiers said: I have been using 207 nylon bonded thread, when I back-tack my topstitching there will be a small ball every once in a while on the bottom. Does anyone know why this is happening? I would guess this thread is bulkier and or stiffer than the polyester you’ve been using and there’s not enough room and or tension for the knot to fully pull up into the material. It might also have something to do with the amount of twist in that brand of thread, type of needle, or inconsistent tension caused by old thread not unwinding evenly off the spool, but I’d guess needle size first. Make sure to hold thread tight when starting the first back tack - leather is less forgiving of tension variations. Quote
kgg Posted January 13, 2023 Report Posted January 13, 2023 On 1/5/2023 at 9:29 PM, Clothiers said: Is it because I am using nylon instead of polyester? More then likely as nylon is stiffer particularly in darker colors with black be more so. What size of needle are you using and what is the thickness you are sewing. kgg Quote Juki DNU - 1541S, Juki DU - 1181N, Singer 29K - 71(1949), Chinese Patcher (Tinkers Delight), Warlock TSC-441, Techsew 2750 Pro, Consew DCS-S4 Skiver
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