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It is always best to start out with brand new needles.
Before beginning to thread, be sure to ALWAYS RAISE the presser foot throughout the threading process. This releases the tension disks so the thread will seat properly.
Follow the thread order when threading or your machine will most likely never work properly. Usually, it would be the upper looper first, the lower looper next, and then the needles. However, your manual should clarify that. Also, when threading each, be sure to give each thread an extra little tug when it goes through the tension disk to make sure it seats correctly.
It may not be the same model, but similar machines pretty much thread the same way. FWIW, always RAISE the PRESSER FOOT when threading. This releases the tension disk and allows the thread to seat firmly. When pulling thread through the tension disk, give each an extra little tug to confirm it is seated.
Also, if there is particular order which thread to thread first, follow the instructions every time or your machine may not work. Overlockers are finicky. Also, if a thread breaks, it is usually better to remove all the threads and rethread from the beginning. Trying to fish a thread through out of order will generally end in failure. In this manual, the pink (upper looper) thread is threaded first, then the yellow (lower looper) is second, then the needles.
You may consider installing brand new needles--be sure they are pushed all the way up before the screw is tightened.
Remove all the threads from the machine.
RAISE the presser foot and rethread from the beginning--double verify that the pathway for each thread is correct. If one guide is missed or threaded out of order, the machine will not work correctly
When threading the tension disks, give each thread an extra little tug to make sure it is seated firmly in the disk. Sometimes the thread will actually make a little "pop" when it seats.
Be sure to thread IN THE ORDER specified--if not, the machine will probably never work. Usually, the upper looper is threaded first, then the lower looper. Also, usually the last step in threading the lower looper is to make sure the thread drapes OVER the top of the upper looper before the tail is pulled under the presser foot.
Set all the tension dials to the midway point which is the standard setting for basic overlocking. Each machine varies and may need some tweaking, but this is a good starting point.
If everything has been done correctly up to this point and it still will not make a chain, the machine timing may be off. You may need to take it for service.
Remember, if the machine breaks a thread or will not serge properly, avoid unnecessary frustration and rethread every thread from the beginning in the proper order. Until you understand the machine very well, trying to fish a thread through the machine will fail ~99% of the time.
On most machines, it is important to ALWAYS raise the presser foot when threading the machine (although the instruction manual says to raise the presser foot only to pull the thread tail under it). Be sure to give the thread an extra little tug when going through the tension disk to seat it properly. Be sure to thread in the order as specified (Upper looper, Lower looper, Right needle, Left Needle). If the machine messes up, it is usually a best policy to remove all the thread and rethread from the beginning. Threading out of order will almost guarantee failure!!!
Sergers are absolute "bears" when threading compared to sewing machines. If/when you get frustrated, walk away. It took me the majority of one day before successfully getting my first serger threaded properly. Using four different color threads is also helpful when learning the serger--especially when it comes to adjusting the tension.
It is very important to pay attention to the order the threads are threaded, as well as making sure the thread path for each is correct. (Consult your owner's manual as different brands will look different.) Most machines require that the upper looper be threaded BEFORE the lower looper because the lower looper thread will cross OVER the upper looper thread as the final step before going under the presser foot.
ALWAYS RAISE the presser foot when threading!!! This releases the tension disks.
Also, when threading through the tension disk, be sure to give the thread an extra little tug to make sure the thread seats firmly in the tension disk. (Grasp the thread just below the thread stand with one hand and then grasp the thread below the tension disk with the other hand and give a little tug--sometimes it will make a little popping noise when it seats.)
Start out with the tensions set at the midway point. From that point, you can test your machine to make sure it is serging properly. Then you can adjust the tensions to suit you or the project you are making.
If the either looper thread breaks or pulls out, remove BOTH looper threads and rethread from the beginning!!! Trying to finagle threading of only one thread will most often result in a machine that will not operate correctly. Just bite the bullet and rethread both threads (in the order specified in the manual).
One more hint: NEVER pull the thread out of the machine by pulling it UP through the machine. This could damage or wear the tension disks. Always clip the threads just below the thread stand, RAISE the presser foot, and then pull the clipped threads DOWN through the looper eyes and needles.
Be sure to clean and oil your serger frequently. This is very important to get the best performance from your machine. Use only fresh oil recommended by the manufacturer and apply only a couple drops each spot.
Your owner's manual should have instructions for rolled hem settings. My Bernina manual has a the following settings:
Medium weight fabric
80/12 Universal needle
3 cones serger thread
Upper looper 3-5
Lower looper 7-9
Left needle (no thread)
Right needle 3-5
Stitch length 1-1.5
Cutting width 2-3
Differential feed N
Can use woolly thread in the upper looper, but the tension may need to be loosened since the woolly nylon thread will stretch.
I'm going to assume here you're talking about a serger. Unthread the lower looper and the eyes of the needle. Set the lower looper tension to 0. Rethread the lower looper, then the needle eyes. Then reset the lower looper tension (try about half a number lower) and see if it chains. If it won't chain, try replacing the needles.
All sergers thread the same way and sergers have to be threaded in a certain order. I made a jingle out of it...
It would be best to have a tweezers handy to help with the thread and threading.
always be sure the lower looper thread goes over the top of the upper looper then out the back. I would be surprised if your thread guides are not color coded.
If you look at the top thread guides or the spools. First from left to right thread the 3rd spool, then the fourth spool. Then you thread the right needle (the second spool) then the left needle (1st spool.
The lower looper can be tricky because you have to thread it from the back of the looper to the front.
Pull the threads out the back from under the foot. Then go ahead and run it slow watching to see if it starts making a chain. It should. If not do it over again.