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Be sure that you are threading each thread in the correct order. The manual should have those instructions.
ALWAYS RAISE the presser foot when threading the machine!!!! For most machines, the upper looper is threaded first, the lower looper second (the lower looper thread finishes by draping OVER the top of the upper looper and then pulled toward the back of the machine), then thread the needles. Give each thread an extra little tug when threading the tension disk to make sure it is seated completely.
Even if you are unable to locate a tutorial for your particular machine, most models from the same era will thread the same.
Don't be surprised if it doesn't work the first, second, or even the third try. It took me most of a day to get mine threaded correctly the first time!!! Patience!
It is difficult to tell what exactly is happening with your serger.
First thing--make sure you RAISE the presser foot BEFORE you thread any of the threads. This releases the tension disks so the threads will seat properly. You may need to remove all the threads and rethread from the beginning, making sure you thread each in the proper order. Start out with the thread tensions set at the ideal setting--usually the halfway point between the high & low numbers. From there, you will adjust them to even up the thread tensions.
Are you actually trimming off some of the fabric as it is stitching? If so, you might try increasing the cutting width (moves the cutting edge further toward the right) so that there is more fabric caught within the looper threads. It also appears that the looper tensions may be too loose. Try tightening the upper and lower looper tensions so less of the thread loops don't fall off the fabric's raw edge.
By the question, it looks like the lower looper is making loops? If so, check that you are using the correct needles for your serger and that the needle or needles is/are inserted correctly:
- needles must be all the way up into the needle shaft
- needles must face with the flat side to the back and the groove to the front
- use at least needle size 12/80, not smaller
Check these few items, if the loops are still not forming:
- re-thread the serger from the start, keeping in mind to thread in the proper sequence (upper looper, lower looper, needles)
- make sure that the lower looper thread lays on top of the upper looper thread and is passed to the back of the serger and then under the presser foot when threading
- make sure that the thread are securely engaged IN the tension assembly
- make sure that the serger is set for 3-thread or 4-thread overlock (i.e. that the upper looper converter is not engaged)
- check all tension setting
- stitch length should be around 2.5 - 3.5
Begin by setting all 4 dials on "3" which is the default setting on this model (often "5" on other machines). If a beginner, it would be best to thread the machine with four different colour threads according to the colours indicated on the tension dials (yellow, red, blue &green) so that it is easier to see how each thread responds as you adjust the dials. The two lower dials are for the loopers & must be adjusted until the upper & lower loops meet on the cut edge of the fabric - if below the edge: tighten the left dial & loosen the right dial (& visa-versa) just a fraction at a time. The two upper tension dials are for the needles: if too loose, loops form underneath the fabric below each needle, & if too tight the lower threads will show through to the upper side of your fabric where it is pierced by the needle. Good luck!
First of all ensure that the serger is threaded correctly.
The two setting which you mention are really a 'range' for an 'average' setting.
Using 'average' fabric such as a medium weight cotton, flannel, etc.; set each of the tensions in the middle of the range and test the stitch. There may be minor adjustment required to get a perfect stitch.
Once you have stitched that first sample, here are some possible minor adjustments required:
1. Tear-drop shaped loops on the underside: Check that the thread is firmly set in the tension dial by giving the needle threads a good snug pull above the tension dials while the presser foot is down.
2. The zig-zag like thread on top should meet the ziz-zag like thread on the underside right on the fabric cut edge. If the meeting happens on top: reduce the upper looper tension slightly and increase the lower looper tension slightly ... test sew and recheck. If the meeting is on the underside: increase the upper looper tension slightly and decrease the lower looper tension slightly ... test sew and recheck.
3. If the meeting does happen along the fabric cut edge but the meeting is hanging beyond the fabric cut edge: increase the blade position (that is, move the blade to the right). If the fabric is creating a ridge or tunnel; move the blade to the left slightly.
Please let me know if this has solved your problem. Otherwise let me know what is happening with the stitch quality.
First take all the thread out of the machine. Put in new needles and run the machine slowly by hand and see if there is a problem with timing. If the needle hits and bends or breaks... take it in to be timed. If the needle don't hit....
Make sure you are properly threading this thing. Unlike a sewing machine which gives you some leeway, Sergers must be threaded in a certain order. Typically, upper looper, lower looper, right needle left needle. If you break a thread you can't just rethread that thread... you have to start from the beginning.
You might check singerco.com for the manual for this thing. They have most of white's manuals online they are identified by a W before the serger model number.