This question is to find out if I can repair my sewing machine. I have a Singer model #6412 and the thread will not pick up from the bottom. There was a metal "v" looking piece under the bobbin case. Is that part of the case or is there something else that needs to be replaced?
By Deb L.
By Frugal Sunnie  09/29/2013
Hiya! I'm a sewing teacher and self-taught sewing machine repair tech:)
That metal V looking thing is part of the bobbin case mechanism - you should be able to see it when you lift the bobbin spool from the bobbin case. Try not to disturb it, it can be a finicky little fellow. Consult the user guide (link to a free download at the Singer site follows) if you have disturbed it for a step-by-step guide to replacing it into the machine:
http://www.singerco.com/uploads/dow ... e675e38ed11eefeaa7d7a62f19f53a03.pdf
In the user guide, see also page 18 for basic troubleshooting info relating to your problem.
If that doesn't help, let me ask you a few questions:
Had you just wound a bobbin? Is it possible you pulled the filled bobbin off the winder pin without snapping the pin back to sewing mode position?
Have you been using metal bobbins? (I believe your machine uses a magnetic float bobbin system, using metal bobbins will over time cause your bobbin case to not engage with the needle to form a stitch - you'll need to take the machine to a qualified repair tech for replacement and rebalancing)
Have you been the correct class plastic bobbins? (Your machine should always be used with a 15 class. Other classes may look exactly the same and may even work 'ok' but there are very subtle variations that can cause problems over time.)