Sewing happily on any material when suddenly the neadle hits metal and bends or worse snaps.

First, check that you are installing the needle correctly. The needle has a flat part and it is important that the flat part be installed facing the correct direction. Inserting it incorrectly will offset the needle position and cause the needle to strike. (Be Careful--flying broken needles can be dangerous--for you and your machine! Wear eye protection.)

If the needle is hitting the presser foot, you might try a different foot. The one you are currently using could be damaged or may not be made for your machine.

If you are sewing thick materials, be sure you are using a heavier needle made for leather or denim. The heavier needle is less likely to bend as it pierces the fabric. (Likewise, you will probably want to use a heavier thread as well.)

Also, be sure that you are NOT pulling or pushing the fabric through the machine. That will frequently cause the needle to bend and strike.

The knob on the left may be the presser foot pressure adjustment. It is adjusted to increase or decrease the presser foot pressure on the feed dogs in order to better feed heavier- or lighter-weight fabrics through the machine.

The motor may not have enough torque to force the needle through the fabric and back in a cycle. If you continue to force the needle into course material, it could bend the shaft, needle, or cause a misalignment of the needle pitch and direction. It sounds like the machine is a light duty appliance and you cannot force it to do commercial appliations.

This sounds like a problem with your tension adjustment. The lower adjustment (for the bobbin) and the upper have to work together or you will get loops that can get tangled underneath. they can wrap around your needle if left to build up and snap the needle. My sewing machine has a screw that can be loosened or tightened to correct this underneath, where the bobbin is. Look for the manual online and see if this is the problem. Hope this helps.

it sounds like the machine could be out of time, I would suggest taking the machine back & getting another one.

You must remove the pins as you sew otherwise you will either break the needle or do worse damage to the machine. Home sewing machines were never meant to sew through metal.

it sounds like to me that the timing is off, check to see how close the needle is to hitting the bobbin when it comes down through the table. that metalic clunk is probably the needle hitting the bobbin holder, OR the bobbin.. check for a bent needle also..

I strongly recommend you desist from using the sewing machine on a levis. It could be that the capacity is not for that thick material like levis.

I had similar problem till I had to take it in for repairs because mine was discovered to have had a shift in the footer below the needle compartment where the clothes are been laid before sewing.

Look closely at the footer.

Good luck dear.

I care so much.

With the needle hitting the bobbin case , it sounds like it might be out of time. Which I am sorry to say is not an easy at-home fix.

It sounds like your timing is off because what you're describing is exactly what happened to me last summer. I took it to a sewing machine repair shop and they repaired the problems, gave it a nice cleaning and it was like new when it came home. But it took two weeks (not a lot of repair shops around here) and that was torture as it's my only machine!!! :)

I have a Singer Sewing machine, Model #6268. The threads have knotted up on the underside of the material. When I finally was able to pull it all out, it caused the needle to hit on the bobbin plate (hope that is right). Now the needle is bending, not going through. How can I adjust it back as it supposed to be? I have had this happen before, but it cost way too much to get it repaired. And I still don't know why this happens (the threads getting tangled).
Thanks!