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when using a 5 thread serger, and all 5 needles have to be used,, but if your using 3 or 4 threads then you'd only use 3 needles, you can remove the needles, just remember to insert them back in correctly
1. The needle is not inserted correctly
Remove needle & reinsert needle( flat side towards the back of machine)
2. The needle is damaged
replace with new needle
3. The wrong size needle is being used
Choose a needle to suit the thread & fabric
4. The foot not attached correctly
Check & attach correctly
bird nesting problems
Try these suggestions
1. Change needle
2. Rethread the machine--top --make sure to use every thread guide
3. Take the bobbin out --make sure it is inserted correctly into the bobbin
Case, & make sure the bobbin is turned the correct way
4. make sure the thread has not come off the thread take up lever
5. Clean under the needle plate & in the bobbin area for lint or threads
The needle thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
Make sure that your bobbin is full and that you have picked up the bottom thread. Before you start sewing you should have two threads lying on the needle plate. To catch the bobbin thread, hold the needle thread and turn the machine by the hand wheel. The needle will bring the bobbin thread up with it. Pull the threads out about 4 inches and then you are ready to sew.
Firsrt, try going slower, especially on curves. The Juki is so danged fast, it's easy to run faster than the thread can handle. As far as tension, the best approach is to experiment with a scrap quilt "sandwich" until you find the best tension settings. Also, could your problem be with the thread you're using? Different threads call for tension adjustments. Try using a bigger needle-smaller needles can "cut" the thread, as can defective needles, especialy on curves with free motion. Tension issues are, without a doubt, the biggest problem I've had, but patience and experimentation will usually solve whatever is going on.
a sewing machine I work on last week, I put a new needle in the needle clamp & thought I had it correctly inserted,, but it wouldn't work,, so I went back & checked the needle again & found I had to unscrew the needle clamp screw even more than normal to insert the needle then it work perfectly.
some needles & thread don't work togeather--here's a tip
Cut 6-8 inch piece of thread of the spool you are going to use for your project
Take the needle you are going to use for the project
& insert the thread thru the eye of the needle
& lift one end of the thread to a 45 degree angle
& if the needle is the right size for the thread it will slide down the thread
But if the needle hangs on the thread you need one size larger needle for the thread
also clean under the needle plate where the feed dogs are for lint
& also in the bobbin area for lint & loose threads