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If your Bernina 930 record sewing machine is experiencing issues with zigzag stitches and straight stitches, here are some troubleshooting steps you can try:
Check the needle: Ensure that the needle is properly inserted and not bent or dull. Replace the needle if necessary, making sure to use the correct needle type and size for the fabric you are sewing.
Adjust the stitch width and length: Verify that the stitch width and length settings are properly adjusted for the desired zigzag stitch. Refer to your machine's user manual for instructions on how to adjust these settings correctly.
Clean and lubricate the machine: A build-up of lint or lack of lubrication can affect the machine's performance. Clean the bobbin area and other accessible parts of the machine using a soft brush or lint brush. Apply a drop of sewing machine oil to the recommended areas as specified in the user manual.
Check the tension: Improper tension can lead to skipped stitches. Ensure that the upper thread tension is properly adjusted for the fabric and thread you are using. Consult the user manual for guidance on adjusting the tension correctly.
Test with different fabrics and threads: Try sewing on different fabrics using different types of thread to determine if the issue is specific to certain materials. This will help identify whether the problem lies with the machine or the materials being used.
Have the machine serviced: If the above steps do not resolve the issue, it may be necessary to have your Bernina 930 record serviced by a professional. There could be underlying mechanical issues that require expert attention.
It's important to note that the Bernina 930 record is a vintage sewing machine, and finding a qualified technician with experience working on older models may be beneficial if further repairs or adjustments are needed.
Sewing on double layers of leather can be challenging, and it's important to have the machine properly adjusted to handle the thickness. Here are some adjustments you can try:
Needle size: Make sure you are using the correct needle size for the thickness of your leather. A larger needle may be required to penetrate the layers.
Tension: Adjust the tension of the upper thread. If the tension is too tight, it can cause the needle to break or skip stitches. If it's too loose, the stitches may be uneven.
Presser foot pressure: You mentioned you have already adjusted the presser foot pressure, but to clarify, turning the adjustment screw clockwise will increase the pressure, while turning it counterclockwise will decrease it. You may need to increase the pressure for thicker materials.
Stitch length: Increase the stitch length for thicker materials. A shorter stitch length can cause the machine to struggle to sew through the layers.
Speed: Slow down the speed of the machine when sewing on thicker materials. This will help the machine to handle the thickness and prevent skipped stitches or broken needles.
If none of these adjustments work, you may need to take the machine to a professional for further inspection and repairs.
When sewing from thick to thin layers, it is common for industrial sewing machines to skip stitches or produce uneven stitches. Here are some things you can try to prevent this issue:
Use the right needle: A needle that is too small or too large for the fabric can cause skipped stitches. Make sure you are using the correct needle size and type for the fabric you are working with.
Adjust the presser foot pressure: The pressure of the presser foot can be adjusted on most industrial sewing machines. Decrease the pressure of the presser foot when sewing over thinner layers to help prevent skipped stitches.
Use a walking foot: A walking foot can help prevent skipped stitches when sewing over multiple layers of fabric. The walking foot will help feed the fabric through the machine evenly, preventing skipped stitches.
Adjust the tension: If the tension is too loose or too tight, it can cause skipped stitches. Adjust the tension according to the fabric you are working with.
Use a stabilizer: When sewing over thin fabrics, use a stabilizer to prevent the fabric from puckering and causing skipped stitches.
If none of these solutions work, you may need to take the machine to a professional for further inspection and adjustment.
Depends on the size and type of hole. If it's large with missing fabric, I back the hole with matching fabric, then zig-zag several times around the hole If it just a tear or slit that can be pulled back together and repaired, I use a darning stitch to connect the torn pieces.
You should be on straight stitch selection, use size 16 or 18 needle, apply longer stitch length(3-3.5mm), always lower down your needle using your hand wheel first, so as not to burden the motor when you started sewing your material. Hope this can be helpful.
As a general rule, domestic machines don't like buttonhole twist, that heavy yellow thread you see on the RTW jeans. Sometimes you can put it through the bobbin but use a regular weight thread on top but this means sewing upside down as you'll want the yellow on top. And lots of machines dont like different weight thread top and bottom so it just makes for awful stitching anyway.
Best solution to top stitch jeans is use a regular weight thread, large size jeans needle but thread up two spools of thread on the top with both threads going through the same needle eye. It still may not solve the problem though.
To your machine, firstly change the needle as it may be bent. Then unthread the machine and manually turn the flywheel through a stitch cycle and listen carefully, if you still hear a noise as the needle touches the rotary hook, you've knocked the timing out. Service man visit time.
Probably if you check the manual, it will say 50 weight thread, and you'll need to stick with that in the future.
Those big industrial sewing machines that they top sew jeans on are very different to a domestic SM, many make a chain stitch or fell the jeans seams and are very heavy duty.
Most machines can sew on jeans fabric, but you may need to go slowly or even hand-turn the needle when crossing thick seams to keep from bending or breaking your needle.
Bobbin: It won't matter if you use plastic or metal bobbins.
Needle: You should use a heavier needle - you can purchase 'jeans' needles, or use the heaviest sharp or universal needle you have.
Tension: For tension adjustment, you can follow the guidelines in your sewing machine manual but you'll also need to adjust the tension based on sewing on scraps of the fabric. If you are sewing light-weight denim, the settings are pretty much the default/normal settings. As you increase the weight/thickness of the fabric and seams to cross, you'll need to loosen your pressure foot tension. If you use decorative 'jeans' thread or topstitching thread, you'll need to loosen your needle tension.
*Always test on scrap fabric to make sure the stitches are forming properly. It is best to make small adjustments to your tension settings, then test, then adjust and test, until it is right. If you sew that weight of fabric often, make note of your tension settings inside your machine manual to save you some time the next time you sew.
I hope this helps.
I turned up my husband's jeans using a size 100 needle. You can get easy thread needles that have a small gap in one side that you slide the thread through. There is a good way to turn up jeans and keep the original hem without having to cut them. Have a look at this site http://www.daciaray.com/?p=38
Not unless the model you are using has more than one height adjustment. This would be addressed in the instruction manual for the machine.
If you raise the heigth of the presser foot too much, the tension control will open and the thread will not form a proper stitch - you will get a loopy stitch that will not hold.
Intersecting seams where you may have 8 layers of fabric can be flatten somewhat with a nylon hammer, or lay a cloth over the seam and use a regular hammer.
I use this when hemming jeans - the flat-feld seams are super thick when turned under for hemming.
Use a longer stitch length when sewing thick fabrics.
Make a sample, replicating what you will be sewing to test techniques and adjustments to the machine before sewing your project.
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