Question about Juki MO-644D Mechanical Sewing Machine
I've already re-threaded and even put on new spools of thread. I have adjusted the thread dials, but they continue to pull to the underside of the fabric, sometimes not catching the bottom back thread.
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Posted on Jan 02, 2017
SOURCE: I have a juki mo-3614
first, pull out the bvlades and make surte they are sharp. It could simply be that they are dull. Next, line tyhe bottom blade up level to the surface of the needle plate. The top blade should be adjusted to where it slices against the botom blade. You may have to experiment with the height adjustment on the top blade, assuming you have a suitable cutting edge.
Posted on Dec 15, 2008
upper tension sets the lower thread tension (upper thread is what you see on the underside of the fabric). Bobbin tension is for the thread you see on the top of the fabric
Posted on Jul 08, 2009
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