I have selected straight stitch and moved the bight so the the needle goes to thes left. The minute I start to sew, it begins to zig zag, even though it is on straight stitch. I know there is a simple solutions - a step I have forgotten, as I have done this many times in the past. I just can't remember, and nothing in the manual tells me how. Also, I have two identical 1630s and they are both doing the same thing. It is me, not the machine that is at fault.
HI Evelyn,
sometimes its just the little things that stop your sewing project; so annoying isnt' it. 
According to the manual I've found, this stitch width inner knob is turned to move the needle position. The outter part controls the zig zag width, so just move the inner knob to move the needle.
Hope that makes sense to you. Good luck finishing your project.
SOURCE: Zig Zag Not working on my Bernina 830.
Basically it is a matter of a stuck part. Flip open the top by prying up on the front or ends of the lid. You already noticed the hinges on the back. When you get it open, exercise the right hand lever on top (marked ZZ at bottom and 1-20 at top. If you look just to the right of this lever against the back wall you will see that it moves a little part back and forth into triangle shaped grooves. The part is not going completely into the grooves so drop some oil in there and exercise it a few more times, using your fingers if necessary to make the part move into the triangle grooves at the front and back. After a while it will loosen up where it should operate by itself smoothly . Hope this helps.
SOURCE: Bernina 830 won't zig zag, won't buttonhole, no decorative stitch
Basically it is a matter of a stuck part. Flip open the top by prying up on the front or ends of the lid. You already noticed the hinges on the back. When you get it open, exercise the right hand lever on top (marked ZZ at bottom and 1-20 at top. If you look just to the right of this lever against the back wall you will see that it moves a little part back and forth into triangle shaped grooves. The part is not going completely into the grooves so drop some oil in there and exercise it a few more times, using your fingers if necessary to make the part move into the triangle grooves at the front and back. After a while it will loosen up where it should operate by itself smoothly . Hope this helps, I know it will.
SOURCE: Zig Zag Stitch not working
THis problem occurred as I was sewing on Neoprene. I was using Gutterman all-purpose thread and a size 80 needle. Tried switching to a size 70, then to size 90. Still unable to zig zag. After inserting a test sample of cotton, the zig zag worked perfectly, so I knew it was not a mecahnical problem. I switched needles again. This time to size 90 for stretch fabric. Voila! Problem solved.
SOURCE: Whenever I zig zag my machine skips stitches.
Hello,
Try these solutions.
* Re-thread your needle
It may be threaded incorrectly (backwards).
* Reinsert your needle
Make sure it goes all the way into the holder and that it’s positioned correctly – usually with the
flat side away from the bobbin, but consult your machine’s manual to be sure.
*Change your needle
Your needle may be blunt, bent, or otherwise damaged.
*Your fabric may require a different needle. Generally, heavier fabrics require larger needles and
thinner fabrics, smaller needles. You may also need a larger needle if
you’re sewing through many layers of fabric. And make sure to use a ballpoint needle for knit fabrics and a sharp needle for wovens (or a universal needle for either).
And make sure your needle is appropriate for the type of thread you’re using.
* Adjust the pressure of your pressure foot
It may be too light for your fabric.
* Change your thread
If your upper thread and bobbin threads are different types, try using the same thread for
both. And use a good quality, brand name thread.
* Adjust your thread tension
It may be too tight or too loose.
* Re-thread your machine
It may be threaded incorrectly.
* Change your needle plate
Try switching to a needle plate with a smaller hole (a straight stitch needle plate).
Important: If you change your needle plate, check to make sure your needle aligns perfectly with
this smaller hole before starting to sew. A misaligned needle could hit the plate and break, which
could be dangerous. And make sure to change your needle plate back for zigzag and other wide
stitches.
I hope this helps you.
Testimonial: "great advice!"
SOURCE: My Bernina 730 record can only run the zig-zag
Sewing machines needs full service now and then (every 10 years will often do). The motor on the 730 series is actually as powerful as they get on domestic machines, and handles just about everything that fits under the pressure foot. Only if the machine has been used a lot over the years are the brushes worn down, but it might need new grease not matter how little it has been used.
However, the stitch applications can sort of gum or clog up if the machine has not been used for ages. Take a look in the manual and oil ever point suggested every time you take out the machine. Try them now and then on slow speed, that might get every function to run smoothly again.
This is as good a machine as any out there, favorably compared to any new machine under 500£. It sews perfect stitches on just about any material, and is well worth a full professional service (At a shop they will always recommend a new machine they want to sell you). All kinds of pressure feet and accessories are available in regular sewing shops and online.
Check with different shops for price on full service. This is a great machine what ever they tell you.
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