Fixing the tension singer sewing machine 522

Generally, thread tension should be adjusted at the top thread. Only in extreme cases should the bobbin tension be adjusted.

http://www.singersewinginfo.co.uk/tension

How to Adjust Tension Sewing Machine

Liz Kettle adjusting your bobbin case tension 1 wmv

Fixing Top Load Bobbin

Sew What Up View thread Singer Stylist 513 threading correctly

see if this link helps you out.
Sewing Lesson 10 How to Fix Tension on Your Sewing Machine
or this one.
How to Thread Sewing Machine

Hi . try adjusting the tension screw on the bobbin case on the thread tension leaf . tighten it slightly just enough that the thread needs needs a little bit of nudging to come out . do the same for the thread coming through the needle . this should help .

top tension must be adjusted to fix loose stitches of bottom stitches
adust the top tension one letter or number higher and sew on a scrap
piece of fabric till stitches look correct,, here is a free manual
http://www.singerco.com/uploads/download/36952a1312a6d8436174ef874f3662471a946b64.pdf

first try changing the needle
then adjust the top thread tension one number or letter and then
sew on a scrap piece of fabric till the stitch improves.
here's a link for a free manual just incase you don't have one

http://www.singerco.com/uploads/download/561_2250-eng_spa_fre.pdf

try adjusting the top thread tension to a lower number,,like if the machine tension is on 2 then take the tension up to 3 & if that doesn't give the correct tension go to 4 & see if that tension is good for the correct stitch

Sounds like the bobbin case spring is failing to hold the thread firmly - especially if you've already tried to adjust the tension and it hasn't fixed the problem.

I'd suggest you replace the bobbin case, preferrably with a Singer genuine part.

I went to the singer website & typed the number in 6218 & it came up with nothing, is that the correct model number?
the tension problem try adjusting the top thread tension to 3-5, & see if that helps the loose tension

It could be that you threaded the machine with presser foot down.

When the foot is down, then tension control is closed and the thread cannot seat for proper control to the needle.

What appears to be a bobbin problem is actually the top thread not having the tension needed (thead is not where it should be within the tension control) to form a stitch.

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