The feeders aren't working. The material stays in one place.

SOURCE: tension on stitches

Loose bottom stitches mean the UPPER tension has a problem. Pull the thread through the tension assembly and test it to make sure the tension is working correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or something in the middle. Raise the presser foot and pull the thread through the tension. It should pull easily!! Lower the presser foot and pull the thread. It should pull noticeably harder.) If it does not work this way( the tension stays loose) you will need to set the tension to Zero, open the discs with a small screwdriver and remove the lint or thread which is stuck in there.
Sewman7

Kelley Buchanan

• 130 Answers
• Posted on May 12, 2009

SOURCE: loose bottom stitch on brother se 350

Hi, general rule of thumb:: loops on the top, problem on the bottom.. Loops on the bottom, problem is on the top.. When threading your machine, stop just before you thread your needle, put the presser foot down. Try pulling the thread. If it pulls easily, the thread is not thru the tension wheel right. If it pulls hard, you got it right.

SOURCE: no tension on bobbin thread

You might remove the bobbin assembly looking for a broken tension spring (maybe a piece of it lying in the bottom the bobbin case.

SOURCE: sewing machine will not stitch.

Is this the first time you have used the machine? If so you need to bring up the bobbin thread by hand before stitching. Only when both bobbin and top threads are up through the needle plate nad pulled towards the back of machine, will the machine form a stitch.

SOURCE: bottom thread too loose; tried

Check for correct bottom thread tension.
It's provided by a flat spring on the bobbin holder.
When the bobbin is correctly installed, pulling on the thread
should meet with slight resistance, and the bobbin should spin without
trying to jump out of the bobbin holder.