Futura needle keeps metal casing

SOURCE: The thread is bunching up

Your problem stems from the faulty foot lever mechanism. It's coupled to the upper thread tension control which only provides tension when the presser foot is in the locked down position.

If the presser foot won't positively engage in the down position, there's no upper thread tension and the thread bunches up below. Everything else stems from there. If the needle has hit the bobbin case too frequently then the bobbin timing may also be slightly out and the needle itself will be damaged and won't pass straight through the fabric; it only takes a tiny deflection from the vertical as it passes through the workpiece for the needle to flex and hit the bobbin case.

In summary, your machine is in desperate need of repair and adjustment. You haven't stated which exact Singer model you have, but they are usually easy to get servicing manuals for or you can take the machine to a sewing machine servicing specialist. Most singer spare parts (even for 100 year old machines) are usually still available fairly cheaply from a variety of sources, just enter "Singer spares" into your search engine to find suppliers.

To prevent re-occurrence, clean the mechanism regularly and lubricate it as directed by the manufacturer using sewing machine oil. Depending on how often you use the machine, do (or have done) a more thorough service periodically to check the timing and also that all mechanism screws remain tightly fastened.

I hope that my reply has shed some light on your problem and enables you to decide what to do next. Please take a moment to rate my answer.

SOURCE: Singer-Inspiration 4220/4228

Send this machine back where it came from! machine. You have described a timing problem which you can not and should not need to do.
Change the needle first and test it to be sure the needle still hits on the hook. If it does,follow the above instructions. If it no longer hits then it's possible it is not as serious as I first thought.I'm not sure if the bobbin keeps coming out or the bobbin case(the plastic part the bobbin sits in) comes out.If it is just the bobbin, insert the bobbin in the case and pull on the thread. The bobbin should turn COUNTERCLOCKWISE. If it turns the other way, turn it upside down and try it again.
If it is the bobbincase,then Remove the needle plate and take the bobbin case completely out. On this machine there is a small lever which holds the bobbin case in position. Looking down on the bobbin case the lever is located at about 11 o'clock and has a small slot in it. It is also probably spring loaded which means it is not easy to turn without a small screwdriver. Insert the screwdriver in the slot and turn it to the left. Lift out the bobbin case and Carefully examine it for any nicks, scratches or rough spots. If you find any, they will need to be removed with an emery stick and or a sharpening stone. Buff with a very fine steel wool for total smoothness.
To replace the bobbin case use the screwdriver to open and hold the lever open while you insert the case back in. The straight part of the case will be on the right and you need to place the case so that the circular part rides on the slight grove in the hook.(The metal thing it sits on). Once you have it in place you can release the lever you've been holding open . It should fit over the edge of the bobbin case and not allow it to come out. Rethread the machine and turn it by hand a few times to see that it is working properly. Good luck!!!
sewman7

SOURCE: Needle hitting metal casing .. Singer Futura CE 200

It happend to me aswell , not getting the source of the problem!
Then I noticed that the bobbin casing was out of the original position, take the whole casing out and make sure that when you put it back that the small metal tension loop at the front side on the right is correct, this image you can see in your handbook, (placement of the bobbin casing)

SOURCE: singer quantum cxl sewing machine needle hitting metal

Your needle is probably to long or you need to open it more

SOURCE: New Problem...I have a Singer CG-550. When I try

On the right of the black bobbin case there are two screws, you can slacken those screws off and move the bobbin case nearer to the guard leaving enough room for the thread to pass through, if the needle is hitting the bottom you may need to retime the machine.