Originally Posted by
OurWorkbench
Why are you turning the handwheel in reverse?? That is what causes major thread jams.
Is it only certain types of bobbin cases that jam up if you turn the handwheel in reverse? I've not studied a drop-in bobbin machine in detail until now.
I suppose the main use cases for moving the handwheel in reverse would be:
1. Upon finishing a seam, but the take up lever went a little past top dead center, so I want to move the handwheel in reverse to put the take up lever back at top dead center before pulling the goods out from under the presser foot.
2. Upon finishing a seam, after bringing the take up lever to top dead center, but when the material is rather thick then I might move the handwheel in reverse to bring the needle to its top dead center so the needle is not sticking into the material at all.
3. Sometimes if there's a thread jam I want to rock the hook back and forth gently while tugging at the errant threads to pull them free.
4. When using the marks on the needle bar to set the timing, if I go a smidge past the mark I would want to go the other way to bring it back to spot on.