Needles flying around the clock

Generally, your machine takes only one length of needle--the one specifically for your machine. Using a longer needle will cause the needle to hit machine parts that it should not--possibly causing broken needle parts to fly anywhere, including in your face. Just because you are sewing thicker fabric, you shouldn't use longer needles. If the fabric is too thick to fit in your sewing machine, then you should not be using that machine to sew the fabric.

First, check the owner's manual to make sure you are installing the needle facing the correct direction. If that isn't the problem, take it for service. This is a dangerous situation. The needle is striking something that it should not. Eventually, the needle may break and flying bits of needle are a hazard.

Heather, switch off machine from electric supply.gently lay machine on its back, you will then be able to look at the needle holder .remember the needle has a flat side and this must corispond to the shape where the needle enters into the space for it . be sure you tighten needle into place with the tool provided for the job. Reston machine back onto it's base . Tread up machine and slowly turn by hand the side wheel to make sure the needle is in the right place. When this is working you can refit electric cable as continue sewing. P'S try sewing on a bit of spare fabric to make sure all is well..happy sewing , lois

Depends on the machine but most take universal needles, ball point for strechy/Jersey fabric, there's a denim needle for heavy duty fabrics that's xtra sharp. Any brand will work on all major machines with low shank. I'm guessing that's what your asking?

Needle is bent or installed improperly.

out of time

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Theres no books as such on setting the timing-it is something only to be attempted by an engineer. I take it you have replaced the bent needle, cleaned out any debris and checked the other needles for damage too. Also check it isnt hitting the needleplate which may now be scarred. Check needle is inserted correct way around.

Things to try:
1. New needle.
2. Make sure the needle is put in the correct way (there are fronts and backs to the needles).
3. Make perfectly sure that your bobbin is put into the bobbin case correctly (the thread going clock or counter-clock wise as indicated in the directions)
4. Make sure your bobbin thread is wound through the case and out as indicated by the directions

(these points vary DRASTICALLY by model of machine and brand).
5. Holding about 4 or 5 inches of top thread, rotate the flywheel (on the far right of your machine) by hand (don't use the footpedal). The needle should go down, it's thread creates a loop, and the bobbin thread loops through that loop; as you continue to rotate the flywheel, the needle will come back up, bringing its own thread AND the bobbin thread. This is when the machine is ready to sew (when both threads are up).
6. If your machine has been moved around and not very gently, then it is possible that the bobbin case and housing have been jostled out of alignment. If that's the case, then you'll need an experienced sewer to look at it for you - mostly that's a case of minor adjustment.

If you remember that the needle is flying up and down thousands of times in a minute, then having all these elements in perfect alignment makes sense.

Even experienced sewists get stumped with this, especially when working with a new machine.