Originally Posted by airmide_m
I really don't sew that often.
and the reason don't is because you have machine woes.... let's try and fix them for you 'sew' you will want to do nothing but sew!
besides being called a rats nest how about.... Birds Nest, Thread Barf, Thread Puke, Thread Spaghetti, or my favorite, Gopher Guts!
It is usally caused from the top being threaded incorrectly, might be that you threaded the machine correctly but the upper thread jumped out from between the tension disks. or you missed a guide or got 2 of your steps backwards.
if that doesn't work then try winding a whole new bobbin and rethreading it in the machine, you never know, won't hurt and having a full bobbin for next time you sit down will be nice.
the sound you are hearing could possibly be a small piece of thread in the bobbin race, hiding where you can't see it, I'm not fmiliar with this machine in particular so this is vauge... the bobbin race, the little finger /spikey thing that turns with the machine picking up the top thread, carrying it around the bobbin and meshing the two threads together... that little piece is usually removable, look in your manual and it should show basic cleaning and possibly to oil it (the metal machines oil, I'm not for certain about some of the newer plastics, there are some that are self lubricating so don't oil unless it's metal or your book says so... ) anyway take the bobbin race apart as far as you feel comfortable and make sure you use a brush old needle toothpick to get all that lint out from behind there, might find a piece of thread caught around the spindle.
Canned air? good/bad? depends, some say the air will force the lint further into the machine where it can never be gotten at, some say what's the big deal, I've used it, I've used a air compressor to blow out a machine... just use caution and try and get the big stuff out first then use the air to get the dust out. You can tape a straw to the end of a vacume hose and suck things out too.
if you don't know if the thread is coming from the bottom or the top, can use 2 different colors
hope that may help and happy sewing!
look here alsohttp://www.cahe.nmsu.edu/pubs/_c/c-202.html
it's is a good checklist to print off and keep around