How Not to Break Your Sewing Machine
I work in a shop where we repair sewing machines (a LOT of sewing machines), and unsurprisingly we see a lot of the same problems over and over again, so I'm here with some advice on how to keep your machine running longer.
When you break a needle, dig around until you have found the broken piece. If you leave it in there, it can end up in the wrong place at the wrong time and break something vital.
SLOW DOWN. The function of your sewing machine depends on the different moving parts ending up in the right place at the right time. Having to go through a lot of/heavy material slows the needle down, but it doesn't slow down the mechanism underneath the needle plate. If you try to go your usual speed, the needle will arrive too late and collide with something it shouldn't, breaking either the needle or the bobbin case. If the material is especially heavy (say you're sewing several layers of denim, or sewing webbing onto canvas), take your foot off the pedal and turn the machine by hand.
Clean out the bobbin area after each project. Really. Your machine comes with a little brush for this purpose. If it doesn't, a little dollar-store paint brush will work just fine. Remember what I said above about things being in the right place at the right time? Everything needs to be able to move freely for this to work. I know it looks like it's just a little dust and fluff, but it will jam up your machine eventually.
If you can, get your timing adjusted by a professional. I know most people don't have a sewing machine repair shop in their neighbourhood, but if you can do this, it's worth it. If the machine's timing is good, then you're more likely to have a little leeway for heavier fabric or a lintier bobbin case. When the timing is just a bit off, it takes less of an obstacle to put the needle in a place it shouldn't be.
If you can, buy a machine built before 1980. If it's still working 50 years after it was made, it's gonna keep working. Those older machines are made with metal gears and therefore weigh a ton, so they're definitely not a good choice if you don't have a permanent setup for your machine, but it means they basically last forever. Newer machines are made with plastic parts, and no matter what you do, they will break.
Don't buy a Singer Heavy Duty. I'm sure those machines have their benefits, but they are absolutely not heavy duty. We repair more Singer Heavy Dutys than any other single model of sewing machine. If you're already stuck with a Heavy Duty, then follow my advice above even more scrupulously, and start shopping around for a replacement if you can. You can get a used sewing machine of better quality for significantly less than a new Heavy Duty.
To keep things working properly, make sure you're:
threading your machine properly
using the right kind of bobbin
adjusting your tension properly
and using the right kind of needle for the fabric you're sewing!
(These things are unlikely to break your machine, but they will keep it from sewing properly.)
Other than that, get your hands on your machine's manual and read it carefully. If you can, bring your machine in for a cleaning and adjustment now and then. Your machine will need repairs every once in a while: it's a lot of little moving parts! But these are some basic precautions you can take to avoid some common problems.
