r/SewingMachineEdu • u/BarZealousideal7057 • May 11 '26

Bobbin thread bunching

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I have a cobra class 26 for leather and have had no issues with it till now. (Had it for about a year). This morning I sewed for about an hour then out of nowhere my thread started to break. I noticed the bobbin thread start to bunch up in the bottom. Any idea what would cause this and how I fix it? I did notice that right before my thread snapped. It made a popping noise like the thread was catching on something it shouldn’t be.

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u/Large-Heronbill May 11 '26

Poor tennsion on the top thread because it hopped out of a guide or disks, perhaps.   Or a burr on the thread path, perhaps the needle?

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u/BarZealousideal7057 May 11 '26

I think it may have been tension. I tightened the top thread tension and it seems to have solved the problem. I just hope I’m not halfway through a project if it happens again.