Re: Thread does not lock. one thread is zig zag the other...
The tension has got to be even between the top and bottom. Good thread is always important. I've included a pamphlet to help you set the tension. If it is still a problem you may need to get it timed.
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So your set up to sew zig/zag and only get the zig or the zag : )
Could be top thread tension is too high. Switch to a straight stitch and reduce tension until top thread starts to appear on bottom. Then go back to zig/zag and see if it sews properly.
If still dropping stitches, check the needle is not bent and is fully inserted into the holder. Clean the bobbin, hook, and race per machine instructions. Try reducing the stitch width and see if that makes any difference. If still not right then timing may be off.
Check that the bobbin thread is not pulling the top thread down when zig-zagging. If so, the bobbin tension may be too tight.
Also, there could be a burr or nick somewhere that is catching the thread when zig-zagging. Wraps very fine fabric around your finger (silk, old hosiery, etc.) and run your finger around the needleplate and underneath. If there is a snag somewhere, the fabric should catch on it. Generally, carefully sanding with a fine emery board or sandpaper can smooth it.
The stitch Width selection regulates straight-stitch or zig-zag width. Needle position does not determine straight or zig-zag. Needle position just determines whether the needle's home position is center, left, or right. Needle position can be used with straight or zig-zag stitching.
FIRST > Make sure your bobbin case is threaded correctly...
NEXT For normal straight sewing the top tension should be around 5, for zigzag or satin stitch you need to lower your upper thread tension a bit. Try it at 4, if it still pulls your bottom thread to the top try it at 3 etc...
The three front dials are as follows....left to right-Stitch width, type of stitch, and stitch length. The dial on the top adjust the top tension.
For straight stitch you want 0 stitch width, straight stitch, 3 for stitch length.
For zig zag you want turn your stitch width to how wide you want the zig zag, choose zig zag stitch, and choose how close you want the stitches to be on the stitch length dial. Practice on a piece of fabric. Usually for zig zag you will want to loosen your top tension a little bit.
THis problem occurred as I was sewing on Neoprene. I was using Gutterman all-purpose thread and a size 80 needle. Tried switching to a size 70, then to size 90. Still unable to zig zag. After inserting a test sample of cotton, the zig zag worked perfectly, so I knew it was not a mecahnical problem. I switched needles again. This time to size 90 for stretch fabric. Voila! Problem solved.
Because it is almost a straight stitch but the needle continues to move in a zig zag fashion is reason to believe it is in a long stitch. By changing the number of stitches per inch there will be a very noticeable looking zig zag stitch.
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