Want this question answered?
What does the stop motion screw do on the sewing machine
It is a part of the sewing machine head which hinders movement of machine when loosened, and enable it to start moving when tightened. -Ms.Des
That screw prevents the "wheel" from loosening during bobbin winding and falling off the machine. When the wheel is tightened for sewing, the screw serves no purpose. Just keep an eye on the "wheel" as you wind bobbins and make sure it is not unscrewing more than it should. A replacement screw should be available anywhere sewing machines are repaired. Just unscrew the "wheel" and take it with you so the technician can find the proper fit.
The sewing machine head is the upper part of the sewing machine. It contains:Pressure regulating thumb screwThread take-up leverFace platePresser bar lifterUpper tension regulatorThread guidesPresser bar and presser footNeedle bar, needle clamp, and needleBed slide, bedThroat plateFeed dogArmSpool pinBalance wheel or handwheelStop-motion screw or clutchBobbin winderStitch regulator
Adjust the bobbin screw. Also, check if it is broken.
There are several online websites that sell acme sewing machines. You can also find an acme sewing machine at local stores that sell sewing machines. Many retailers who sell Acme screw machines have websites. These include, but are not limited to, www.pridemachinery.com, www.nova-machinery.com, www.aaafasteners.com, and www.acmecompanies.com.
The threads are what make it work. As you will know if you have tried to use a screw with stripped threads, it is useless. That is because a screw is a simple machine built from an even simpler machine: the inclined plane. The threads are an inclined plane wound around the outside of the screw, and are what change the twisting motion into a lifting motion.
the purpose of having a simple machine is to make life easier
The machine won't work if not in correct order. Believe me. Many times a screw up or mistake is because of not following the directions. Sewing machines have those books too.
The screw that tightens to hold the needle in place, and loosens when you want to change the needle.
Sounds a lot like sewing to me. The tension can be loosen or tightened.
The screw that tightens to hold the needle in place, and loosens when you want to change the needle.