Real Important: The objective is to even the top and bobbin tensions equally.
1. Remove bobbin case. Put bobbin in (rotating counterclockwise).
2. Put thread under the tension plate. Let the bobbin hang from finger and bob up and down lightly.
3. Adjust tension. The bobbin should extend one inch every time it is bobbed.
4. Put one drop of oil on race the bobbin case sets on top of. Replace the bobbin case and bobbin.
5. With the pressure foot up thread the top and give little tugs as you do this. There should be no snags or resistance. Make sure the thread goes in between the tension disc.
6. Now, put pressure foot down. Give a little tug to see if there is a resistance. Set the tension to four is a good start.
7. Try a piece of rag to sew. Set the tension on top to adjust for a perfect stitch.
SOURCE: Proper Settings
A good standard tension setting is usually around 4.5.
If you find it to be looping on the bottom, raise your top tension. If it's pulling bobbing thread to the top, lower your top tension.
For straight stitch, your stitch width should be set to zero, although on some machines (and I believe your Baby Lock to be one of them,) the stitch width setting will change your needle position.
Stitch length is simply a matter of preference.
-R
SOURCE: Need to know how to set the tension to sew hems on
Re-thread the machine and make sure that the needle is in properly. The tension would not cause the thread to break.
If it is not working, what is the machine doing? Try re-threading the
machine again, check the needle to make sure that it is in correctly.
There are no set numbers for tension- it is a feel, push, pull. If you
could e-mail me back with a better description of what the machine is
doing or not doing,
SOURCE: inherited old kenmore 10 sewing machine. it is
It sounds like your upper tension is too loose. A good place to start adjusting is at the number three on your tension dial, but you need to pay attention to how the stitches look rather than what the number on the dial is. I wrote a Tip on Adjusting Tension. Take a look at that and see if it helps.
Robbie
SOURCE: I have an old machine
You could try loosen the tension on the upper thread to 2.5-3.0 or Lengthening your stitch to 3 or 3.5 should also help.
is the needle inserted correctly?
is it the right needle for the fabric being sewed?
it's possible that it could also be a timing problem, which means it would have to be check at a sewing machine shop
there are stitch control one for straight stitching and one 
if you are90 views
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