Raise the presser foot. and close the slide plate over the bobbin. Hold the tail of the needle thread loosely. Turn the hand wheel toward you (counter clockwise) and lowerthe needle into the hole in the plate. Keep turning the wheel until the needle rises back up to it's highest position. Gently pull back on the thread until you see a loop of thread come up from the bobbin case. Open the loop and find the free end of the bobbin thread. Voila! Now you can sew.
Hold the tail of the needle thread loosely. Turn the hand wheel toward you (counter clockwise) and lowerthe needle into the hole in the plate. Turn the hand wheel until the needle rises back up to it's highest position. Gen You will see a loop of thread wrapped around the upper thread. Open the loop and find the free end of the bobbin thread. Voila! Now you can sew.
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I am not sure about this particular machine but in most machines there will be a nob on the front loose low numbers like 0 1 -2 work well on number 3. If the nob is not on the front check and see if it is on the side.
500/550? wow, that an old one. have you check your timing? or the bevel gears?
what type of problems are you having with the sewing. is the thread knotting up on the back side of the fabric? is the thread just breaking? or is it just missing stitches? does the needle hit the bobbin case?
I have a 600 series and I found that if i put the tension around 2 or 3 it sews the best.
too tight the tread breaks, too lose the thread knots up on the back.
I had to change out the bevel gears and have the machine re-time to stop the miss-stitching.
also may want to check your bobbin tension.
try changing the needle---flat side goes to the back side of the machine also check the top tension depending on the fabric your sewing on--the needle & thread have to work with the fabric--example light fabric needs a different needle & thread than a heavy fabric check to see if the thread is coming off the thread take up lever when you sew.
A sewing machine operator can often help themselves when their machine does not operate properly. Here are some simple instructions, which if properly used can save time and mechanics service calls. TROUBLE;UPPER THREAD KEEPS BREAKING; This could be trouble;================Do this; 1.Top tension to tight================loosen tension 1 turn 2.Machine improperly threaded=========check threading 3.Thread twisted on guide post========" 4.Thread twisted out of tension=======" 5.Take up spring bent or broken=======Check action of spring 6.Thread jumped off pull off finger===Check threading 7.Needle bent or burred===============new needle 8.Bad cone of thread==================try another cone TROUBLE;LOWER THREAD KEEPS BREAKING; 1.Bobbin tensionspring to tight=======Loosen tension slightly 2.Bobbin threaded wrong===============check threading 3.Bobbin wound to tight or uneven=====try new bobbin 4.lint or thread on bobbin case=======clean inside case 5.Lint or thread inside hook==========clean inside hook 6.Bobbin case nicked bent or burred===check/change case TROUBLE;MACHINE STARTED SKIPPING STITCHES; 1.Needle bent or burred===============change 2.Needle set in crooked===============Check 3.Thread jumped off take up spring====check threading 4.Thread jumped off pull off finger===check threading TROUBLE STITCHES SHOWING LOOPS; 1.Forming loops on top of cloth=======Tighten bobbin tension ======================================or loosen top tension. 2.forming loops on bottom of cloth====Tighten top tension 3.Bobbin placed in case incorrectly===remove and replace 4.Bobbin thread slipped from under====check threading of tension===============================bobbin case 5.Lint or thread in top tension=======clean between tension discs
I had a Golden Touch 'N Sew many years ago and as the machine aged and parts became worn, step 4 of this bobbin winding diagram started to become a problem and I had to sometimes try several times before the "tabs" would release. If they did not release, the machine "thought" it was still winding the bobbin and would not sew.
This is a tension adjustment problem. It's good to use two different colors of thread, like you did. From your description, the top thread (needle thread) tension needs to be tighter. As you tighten the tension of the top thread, you'll see that the top thread pulls the bobbin thread up into the fabric so it's no longer laying loose on the bottom of the fabric.
You'll need to have the pressure foot down when you tighten the tension. Tighten it a little, sew a practice seam, check to see what the stitch looks like. Tighten it a little more, sew, check, etc etc--until both top and bottom look the same--you shouldn't see much (if any) of the bobbin thread color on top of the fabric or the top thread color on the underside.
You can find Singer bobbin winding instructions at http://www.singerco.com/resources/bobbin_wind.html.
"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.