Spring in bobbin compartment unhooked. It is the smaller of the two. It is hooked near the back where the larger spring is hooked, but whee should the other end be hooked?

A blue bobbin case spring in a Bernina Artista 180 sewing machine could have come from a variety of places, such as the hook assembly or the needle plate. If you have checked all of your bobbin cases and they all have springs, it's possible that the spring may have fallen out of another component of the machine.
As for the color of the springs, it's possible that the manufacturer may use different colors to differentiate between different models or variations of their machines. However, the color of the spring itself should not affect the performance or functionality of the machine.

I suspect the bobbin thread has escaped its tension spring. If you give the bobbin thread a quick short tug and the bobbin spool spins then likely the thread is not behind the tension spring. This usually causes hook jam but not always.



First be sure you have threaded per machine instructions... see below.



Next turn handwheel and position needle at the high point of stroke (always when loading bobbin). Remove and re-insert bobbin. Now, to be sure the bobbin thread is fully positioned behind the tension spring, before you move the bobbin thread into the notch, place your right index finger on top of the bobbin spool to prevent the bobbin spool from turning. Hold thread snugly (in slight tension) as you move it towards the back of the notch. You should feel the thread slide in place behind the spring. Let loose the spool and lightly pull thread. Note the resulting change in tension. (don't forget to set top thread tension back to a more normal setting)



Comment here if you require further assistance.



If you need... your manual may be downloaded at no charge from the Janome site.
https://www.janome.com/siteassets/support/manuals/embroidery-models/inst-book-mc350e.pdf

the long bit faces the slot by which you pull the bobbin thread
the other end will have a small lip that will fit in the bobbin case near the screw hole
with the screw , it requires only a small turn to make large tension changes on the thread so it is not done up tight
the spring virtually just sits on the bobbin carrier case

Hello, here is place to download manual
Viking Husqvarna Sewing Machine Manuals PDF and CD

Your Bernina 180 is a rotary hook model and there is a bobbin case retainer mechanism below the sticth plate that has a long spring on it - it sounds like this has become detatched at one end and may well be affecting the stitch quality. Take the stitch plate out and you will see a black rectangular metal bar in front of the rotary hook mechanism - there is a small silver part in the middle that fits in a slot in the rotary hook bobbin basket - the spring should fit on this and then extend the length of the black bar and pull onto a retainer at the other end so that there is fairly strong tension on the silver part. If not this spring, then it's probably something that's dropped-off from elsewhere and maybe, possibly the feed-dog cam retaining spring. Let me know what you find.

There are two springs on the bobbin case of a rotary hook machine like the 180 and I suspect you're talking about the thread tension spring on the outside of the case - this is held on and the tension adjusted by a two very small screws. The other spring is the brake spring which is a complicated shape spring that sits in the bottom of the case and puts a slight amount of pressure on the bobbin itself. Assuming the thread tension spring has been recovered along with its two screws, it should be fairly self-evident how it fits back onto the bobbin case - the spring lays across the **** in the bobbin case, through which the thread is pulled, so that the tip of the spring with a small right-angle bend just sits down into the aperture where the thread comes out. Now, importantly, the two screws are different sizes ... the one with the smallest head holds the spring onto the bobbin case and is screwed-down firmly through the hole in the flat end of the spring. The larger screw adjusts the thread tesnsion and is screwed through the hole with the slight conical sides. Now the tension should be adjusted to 5g using a proper gauge, but failing that, insert a bobbin loaded with a thread such as Metrosene and thread the bobbin case up. hold the end of the thread so that the bobbin case hangs on the thread - it should not move/unreel itself. If it does, adjust the tension screw (the bigger one) a little bit at a time until it doesn't unwind. The approximately correct tension is obtained when the bobbin will only unreel when you **** the thread upwards gently. You can fine adjust the tension to get the correct balance by ensuring the top tension is set to normal (red line) and adjusting the bobbin tension until the stitch lays properly in the fabric - use different colours top and bottom to check this. Be aware that the bobbin thread tension varies quite alot with only a small rotation of the adjusting screw, so take it is small steps.
Hope this helps.

Hello

Turn off the power. Remove the accessory compartment located in front of the machine, if applicable.

Open the hook cover that shields the bobbin area. Please note that you do not need to remove the bobbin case.

Locate the drop feed lever near the bobbin case. Some machines have the lever towards the back of the free arm. Press down on the lever and then move it to the next notch or position. The raised metal feed dogs should be visible through the openings on the needle plate. You may need to rotate the big balance wheel one rotation to engage the mechanism on some machine models. The metal teeth will then spring up.

Close the hook cover. Insert the accessory compartment, if applicable.

Turn on the power. Try test stitching a piece of fabric. The raised feed dogs should help guide the fabric under the presser foot.

You may want to take it to be looked at by a professional if there is a part loose.

I have constant problems with thread breaking and being tangled in the bobbin area with this machine. It can usually be remedied by adjusting your tension. Also, class 15 bobbins stink for this machine (yes, it says they're compatable, but they seem to be 1/8 of an inch too shallow and constaly become unthreaded from the bobbin casing). Try SA 156 metal ones.

It is most likely the feed dog return spring. A cam lifts the feed dogs up and the spring pulls them back down. It hooks to the feed dogs bracket and goes straight down to the machine frame, there should be a small hook or post for it. You may be able to sew slowly without it attached.
good luck!

I was having the same problem with my machine and finally the spring broke. I couldn't find any parts for this so my husband made me a new spring out of a coke can! LOL!! Anyway, he messed with it for a while and it kept doing it. He figured out that it was not the spring but the other piece under the spring was not pushed up far enough to keep the bobbin case in place so he took a screw driver and pushed it forward toward the bobbin case and now my bobbin case does not move!! And the machine is sewing perfect! At least for now. Anyway, it's not the spring or the thread adjusting screw!