Victorian Sweatshop Forum
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Junior Member
Posts: 19
Reply with quote  #1 
Time flies, it's been a while. This is still my go to place for advice, though.

I needed thread for some canvas (sailboat sprayhood) repair, and found an online vendor. His description and recommended use echoed the thread manufacturer's, but he added on his own accord the advice to use a thinner (and weaker) bobbin thread, without explaining why. On request he explained that some domestic machines won't handle thick bobbin thread. I will be using my Naumann 65 industrial so I'll be ok, but:

My understanding of the finished seam is that - providing the tensions are adjusted and the stitch is balanced - both threads do exactly the same job, and carry the same load. If I'm right, the seam cannot be stronger than the weakest thread, and the implication that a strong needle thread will give a strong seam, is simply false.

As the vendor is one of the largest in the country on all things sewing and knitting, he is regarded as a specialist, and his advice will be heeded. Customers risk critical projects weaker than neccessary. I want to point out this possible error to him, but I need to make sure I know what I'm talking about first.

So; Do I? If not, please educate me.


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Senior Member
Posts: 3,951
Reply with quote  #2 
He's right that some domestic machines can't use thick thread. That's about all I agree with however. This is akin to quilters who use serger thread to piece with. There's no way a thread that thin, meant to be used with several threads as a particular overlock stitch, can sew as strong of a seam doing a 2 thread lockstitch as using thread made for the task would be.


Wow, that was a run on sentence.

Olympia Washington

Senior Member
Posts: 893
Reply with quote  #3 
I agree with both of you.  From my experience, the seam will only be as strong as the weakest thread.
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