Question about Juki MO-644D Mechanical Sewing Machine
I have adjusted it a million and one times, not to mention changed the quality of the thread. I tested it with various colors to make sure I isolate the problem, quadripled checked that I threaded it correctly. Every other looper is fine, but when I flip over the fabric and stretch it out I can see the loose thread separating the fabric--again it is definitely the right loop yet no adjustment has worked to tighten it with the many combinations with the other tensions. What can I do. I'm going crazy!
Check the tension disks. Sometimes a piece of cotton breaks off in between the disks and prevent the disks to tighten properly. When you pull the thread with your left hand and adjust the tension with your right hand you should be able to feel if there is any resistance. If no resistance can be felt, it certainly is a problem with the tension disks.
Posted on Nov 16, 2007
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Is it a three or four thread machine?
A three thread has little strength used as a seam.
On a four thread,basically, it is a tension problem. You need to ensure that the presser foot is in the up position before threading. The correct path is followed for all threads. You are using good quality thread. Reset the dials to 'normal tension' #3 or 4 .... then slowly work your way from there. The manual should offer advice on which tension to adjust to correct a particular problem.
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