The machine keeps jamming and the bottom threads are bunched up. I have the correct thread for denim and #16 needle. The machine worked fine for most of my project but now it doesn't. I have used this machine for maybe a total of 4 hours
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Refer to 'Manuals Online', Brother sewing machine user manual. There is an excellent guide to tension settings for all fabric types. Also remember to check upper and lower thread has been wound through correctly and are using the same thread top and bottom. Ensure you have the correct needle size for denim ie 100/16 and the correct thread size ie 40-50 cotton or heavy duty polyester.
Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center.
Always be sure your presser foot is in the DOWN position before sewing. Sewing with the presser foot in the up position will cause your thread to tangle and your bobbin to jam.
Change needles regularly (after 16 hours of use) as dull/weak needles can cause damage to your machine and fabric. Only use SINGER needles on your SINGER sewing machine.
Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.
Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center.
Always be sure your presser foot is in the DOWN position before sewing. Sewing with the presser foot in the up position will cause your thread to tangle and your bobbin to jam.
Change needles regularly (after 16 hours of use) as dull/weak needles can cause damage to your machine and fabric. Only use SINGER needles on your SINGER sewing machine.
Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.
Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center.
Always be sure your presser foot is in the DOWN position before sewing. Sewing with the presser foot in the up position will cause your thread to tangle and your bobbin to jam.
Change needles regularly (after 16 hours of use) as dull/weak needles can cause damage to your machine and fabric. Only use SINGER needles on your SINGER sewing machine.
Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.
Your bottom thread looks like the top tension is too loose or not being fed through the tension disc.
1. While you thread do it with the pressure foot up. Make small pulls while threading to make sure there are no snags.
2. When you finish threading put the foot down. Check for resistance on the thread. There should be some; not excessive though.
3. Always start at four on tension and adjust as you need to.
thread loops on the bottom is a sign that it isn't threaded correctly or the tension isn't set right.
Industrial machines tend to do some strange threading procedures. Are you sure you have it threaded correctly? Two of the machines I've had required that I do a 360 around one of the tension discs. I would start there.
Also some industrial sewing thread is waxed and that wax can cause you issues in between the tension discs. Raise the presser foot and take a piece of sturdy material like canvas or denim and "floss" between those discs. It will help remove wax build up that could be keeping your tension discs from working properly.
some sewing machines can not sew denim good,
here are some suggestions
since a needle was broken & replaced--if the needle has a flat side it goes to the back of the machine
make sure the needle is inserted correctly & pushed up inside of the needle holder & the needle screw tightened correctly
is the correct needle being used for the thread & fabric being sewed?
when sewing denim, a denim needle is needed, I usually purchase mine at walmart, I have 2 necchi sewing machines & the denim needles work just fine on my machines.
if none of the above suggestions help then the machine could be out of time, just because of a broken needle. only a repair shop has the correct tool to fix this problem
About the needle problem, Brother's FAQ gives the following response:
Make sure the needle is correctly inserted with the flat side facing the back and pushed up into the machine as far as possible.
The needle could have been damaged or bent. If so replace with a new one.
Make sure the fabric is not pulled excessively when sewing. Let the feed dogs move the fabric. Do not pull the fabric.
The combination of needle size, thread size and fabric is incorrect. Be sure to use the correct needle and thread size for the fabric you are sewing.(example: Denim-size 16 needle and 40-50 heavy duty thread).
As for the manual, here's the link: http://welcome.solutions.brother.com/BSC/public/files/dlf/doch000063/ps21xl55565700ug02en.pdf
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