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401A Tension Problem - Overfilled Bobbin

401A Tension Problem - Overfilled Bobbin

Old 03-20-2018, 12:03 AM
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Default 401A Tension Problem - Overfilled Bobbin

I filled the bobbins until they bulged a little bit, and while other machines had no problem with them, in the 401 they made me first have a too tight bobbin thread, and then a few minutes later, the top thread was too tight. I remember someone else having this problem, and I may have just figured it out.
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Old 03-20-2018, 07:59 AM
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Thanks for posting this. I've occasionally had tension problems with my 503 and once on my 401. It seems as if the tension is too tight (or too loose), and I give up on figuring out what is wrong after threading and rethreading and adjusting the top tension. Then, the next day it's fine. I almost think I imagined it. It's probably happened 2 or 3 times on the 503, which is very similar to the 400 series.

I'm not sure that's the problem I had, as you can't overfill the bobbin on the either of them. By that, I mean it can't fill past the outside edge of the bobbin as it stops filling automatically. I finally adjusted the bobbin filler on the 401, because the it had to be filled too often. I have contemplating adjusting it again to reduce the times I have to fill it.

I'll follow this thread to see if you get any answers.

bkay
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Old 03-20-2018, 09:29 AM
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Bkay depending on the adjustment the bobbins can be over filled as well as under filled. Also, tension issues on any machine can happen from a bobbin that is filled too tightly or too loose.

Cari
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Old 03-20-2018, 02:23 PM
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Originally Posted by Cari-in-Oly View Post
Bkay depending on the adjustment the bobbins can be over filled as well as under filled. Also, tension issues on any machine can happen from a bobbin that is filled too tightly or too loose.

Cari
So, how can you control loose/tight? Obviously, by not running the thread through the tension guides, you could make it too loose. How else could you affect it?

bkay
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Old 03-21-2018, 08:37 AM
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By not threading the machine properly for winding a bobbin, winding a bobbin too fast, winding an uneven bobbin, the bobbin tension guide having a worn spring or the spring not being tight enough. On one of my 301s the spring is actually missing from the bobbin tension guide. I hold onto the thread with my fingers to give it tension while winding a bobbin.

Cari
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Old 03-21-2018, 10:46 AM
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The only time I have had this problem with my 401A I had some how sprung the bobbin holder and had to get a new one. When I got the new one it has always worked perfect. Be sure to thread the needle from the front toward the back or it will tighten up and break every time.
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