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Ok, it's a serger. Wondered why a sewing machine would be cutting unless it had the cut-n-sew accessory.
Most likely the blades are damaged or malfunctioning. Is the blade still moving when it is stitching? Is it just chomping away at the fabric but not cutting? If so, either or both blades need to be replaced. Consult your owner's manual. Usually only one blade can be installed without any technical knowledge. You can probably order the replacement blade and install it yourself. However, the other usually needs to be replaced by a knowledgeable technician because it requires some precision.
Has the blade stopped moving at all? If so, how long has it been since a thorough cleaning and oiling? Take it for service.
make sure that the thread tensions are correct for the thickness of material
remember that only the bottom foot walks and draws the material through so it may need a help and be pulled as it sews.
I find that women in sewing shops just love to talk about problems and how they can help so find a shop and discuss any problems with them
No you do not need the cutting blade to serge but you shouldn't have to remove the blade it you should be able to push the knob at base of blade inward or pull it outward to turn blade downward out of the way.
You should be able to disengage the cutting blade. Probably a button that you push in then rotate anti clockwise, this will turn the blade down under the machine therefore not cutting the fabric.
Set the tension on the sewing machine for the weight of the material you want to sew. The tension setting shows in the stitch on the material. Use the chart on the machine that matches types of stitches with suggested material tensions. An example of this is, the stitch to sew jean material is different than the stitch to sew silk.
Take the bobbin and wind the thread around it. Make sure the bobbin is empty and don't fill it too full of thread. A bobbin filled too full won't stay tightly spun.
Thread the string evenly on the bobbin. Move the thread back and forth evenly and in layers that are level. Many Singer sewing machines have a bobbin winder on the top of the sewing machine, and the consistency of how it threads can save you frustration later.
Find the hole on the bobbin that is located near the inside spindle of the bobbin. Take the thread sitting on the sewing machines spool and insert the thread in the hole from inside the bobbin to the outside. Set the threaded bobbin on the spool designated for spinning on the top of the sewing machine for some Singers.
Turn the side drive wheel slowly until the threaded bobbin has a layer or two of thread on it. Push down on the drive peddle and fill the bobbin, but don't thread it to the very edge. If the bobbin is too full the thread will release erratically. Cut the thread from the spool.
Drop the bobbin into the bobbin case under the area where the needle sews the material. Close the case and turn by hand the side wheel drive until the bobbin threads into the sewing machine. You can tell when the bobbin is threaded by the tiny piece of thread that juts out of the bobbin case where the needle goes up and down.
Grab the thread with your fingers and pull it out approximately 4 inches. Your bobbin is now spun and threaded.
First to see if the top blade is pressing against the lower blade when it goes past to make the cut.
You should be able to push the top blade to the right and have it spring back to the left. Do that to see if there is a small amount of presser on the lower blade.
Next, the cutting part of the top blade should drop just under the lower blade buy about 2 mil.
Also the lower blade should be level with the needle/stitch plate.
Blades also may need sharpened. The top one can be done with just about any sharpening tool but the botom is carbide so you will need a dimond wheel to sharpen it
Sergers are not really meant to sew very thick material. The blades have a maximum amount of range, or thickness that they can reach to cut. If you go outside that range, get ready for a big repair bill! You can break loopers and even the needle plate when you "push" a serger. My advise would be to use you sewing machine for the, "pounding" work. The type of material matters too, A thick Quilt like fabric can be sewn becatuse it's not dense material. A thinner harder denim could max out at 3 layers because of it"s hard finish. If the fabric you're sewing isn't dense like, you could just need new knives.