Brother CS60000i: When I sew either a straight stitch, decorative stitch, etc., it seems that this machine is terribly noisy. It isn't as quiet as other machines I have used.

SOURCE: Sewing machine straight stitch is not straight

Hey. It's full out possible that you have it on the right setting...but concider this - the switcher inside the sewing machine could be broken (ie. It's moving to different stitches - but not the one you have the outside set for)

It happened to me (pc o crap singer model)

SOURCE: Singer 2010

If model 2010, the problem is a part metal- part plastic part attached to the bottom of the bobbin winding lever, the white tear-shaped thing with the arrow on it. If that will turn past the center of the bobbin it's broken inside. to try a do-it-yourself fix, turn upside down, remove 4 screws, including one by the plug (which must be pulled out for safety anyway) remove bottom case. looking at left end of the works, move the bobbin lever and you'll see the broken part move. The plastic part should be broken about half-way down. You can see how the part should push the white plastic bobbin winding shaft up and down when lever moved. the part can be removed by loosening the 2 tiny hexnuts holding it on the metal shaft. you'll need the smallest size allen (hex) wrench there is. NOTE where the part is at bottom of the metal shaft for when you put have to put it back on. be careful to hold the bobbin winding shaft itself in place, but it's easy to see how it goes back in if it pops out. if the break is clean (like my wife's that I just fixed this way yesterday!) you can put a drop or 2 of good crazy glue in the break, making sure lined up on the sides, then clamp in a vise (or hold firmly together with pliers) for at least 10 mins, longer better. wait at least an hour before putting back. putting back on is a little tricky but you move the bobbin lever to left (open) position, make sure it's just on the end of the shaft (shaft barely protruding) and see where the part isn't pushing the bobbin winding shaft. re-tighten with hex wrench then see if the repaired part now pushes the bobbin winding shaft up and down when you move the lever back and forth. Turn back over and move the lever without a bobbin spool- you should see shaft move up in the middle of bobbin case where it will engage the bottom of the bobbin spool where the x is.
Now if part can't be fixed it is available from auth Singer service center in you state but runs $40 or so. they'll try to tell you they have to install it because of special anti-static gloves that wont fry your motherboard on the machine's computer, but the center in Michigan finally said they would mail it to me. hope this helps! funny I just saw this after fixing our machine which hadn't been used for a long time until I decided I might as well look inside if I was going to have to buy her a new machine!!!

SOURCE: janome straight stitch loose

I don't know if this is the right answer for any of you, but thought I'd put my 2 cents worth in. Often this can be the bobbin in backwards. It needs to unwind a certain way depending on the machine. I've heard a phrase for this: Mind your p's and q's which means some wind off to the right like a q, others to the left like a p. Mine has to unwind one way then be slipped backwards into a little slot or it does that loose bottom thread looping and bunching someone here mentioned. It seems everytime I get that problem I rethread the top thread 100 times before it clicks again and I remember it could be the bobbin thread. Either your manual will tell you the correct way, or you could experiment and try one or the other. Once you figure out whether you're a p or a q, mark it on your machien somewhere to remind yourself.

Good Luck and Happy Sewing!

SOURCE: Singer Touch Tronic 2001 Sewing Machine Stuck on Sewing Straight Stitch Only

I had a similar problem a couple of years ago. I finally figured out that I had the straight stitch needle plate (the one with the single hole), rather than the zig zag needle plate (the one with the curved hole). When I changed plates, it worked fine.

SOURCE: Shirring fabric?

When putting your shirring elastic on the bobbin, don't thread the elastic through the bobbin holder,adjust the stitch length longer,and loosen the tension, other wise if you want to put it through the bobbin holder you have to loosen the tension screw on the bobbin holder, and then you have to adjust it back for ordinary sewing,