loose sewing stitches

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I have a problem getting my singer touch and sew machine model 646 to sew  
evenly.  The bbottom stitches are loose.

Re: loose sewing stitches
Sito wrote:
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Check that you have the upper thread path (to the needle) threaded  
correctly, with the presser foot UP..

Clean the entire path, making sure you "floss" between the tension  

Re: loose sewing stitches
Quoted text here. Click to load it

Here's a series of photos I took -- how slightly misthreading a sewing machine can affect
the stitches:  http://www.picturetrail.com/sfx/album/view/22521551 The photos are in pairs,  
first the top of the fabric and then the bottom; the top thread is blue and the bobbin thread is
red.  Generally, if there are loops on the bottom of the fabric, there's too little tension on top, often
because the machine was threaded with the presser foot down so the thread couldn't get into the  
tension disks.  If there are loops on top, it's usually too little tension on the bobbin thread --  
again, usually a misthreading issue for beginners.


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