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Re: I am using black bobbin threaad with white needle
In my experience, I can adjust the tension on my older machines (like my Singer Featherweights so that the needle thread will not show at all on the underside of the fabric (and the bobbin thread will not show at all on the top)--but I've found it nearly impossible to get the same degree of control on my newer (computerized) machines. It always seems that there is a touch of the needle thread showing on the bottom and a touch of the bobbin thread showing on top.
I'm not familiar with the MegaQuilter but I'd just keep playing with your tension control to get it as fine as possible.
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the needle used depends on the fabric being sewed. the needle must move thru the needles eye smoothly. make sure the machine is threaded correctly, using every thread guide make sure also the bobbin is wound correctly and that the bobbin is inserted into the bobbin case correctly, if the bobbin is turned the wrong way the machine wil not sew here is a link for a free manual, if you don't have one http://www.singerco.com/uploads/download/756_white-3300-emb-x.pdf
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
try these suggestions change the needle--use needle according fabric being sewed rethread the machine top & bobbin clean under needle plate & in bobbin area for lint or threads make sure the bobbin is not warped or damaged make sure the bobbin case is not damaged if none of these suggestions help, then I suggest having the machine checked to see if there is something wrong with the inside parts
Upper thread breaks
needle may be in backwards
Raise the needle bar to the highest point, then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
upper tension may be to tight
the needle may be bent or damaged
thread may be hanging up in bobbin case--check area for loose threads or lint
Check the needle to see if it's damaged
check the needle to see if it's in backwards
Make sure the bobbin has a 3-5 inch thread tail
Then make sure the top thread has a 3-5 inch tail
Then hold the top thread tail with your fingers (away from the needle)
& use the hand wheel on the right hand side of the machine to slowly
Lower the needle in the bobbin area & see if the bobbin thread will pick
Up that way
The problem you describes sounds like it maybe caused by a burr along the thread path. Does the thread shred or does it appear to be cut? Does this only happen with so fine or with other threads as well? Take your finger or if that doeswork use a cotton ball, along the thread path, you are looking for a sharp spot that will be causing your thread to shred. Change you needle for a new one, Make sure you put it in the correct way. Also if these don't do the trick hand wheel the needle up and down a few times. make sure that there isn't a burr in the throat plate from a broken needle and observe near the bobbin case and timing finger that the needle isn't rubbing against something( you might want to use a magnifing glass). i hope this helps. I know how frustrating it can be .
Try at least 2 new needles first (HLX5, preferably Schmetz). If same, look for any rough edges on the needle plate and feed dog cover. Beyond that, this does not sound like you are doing anything wrong. You should take your machine in for adjustment by an authorized technician. You should have about 1/2 to 1 full turn of the upper tension knob between too loose/ugly on back and too tight/breaking on the top.