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Posts Tagged ‘Bernina Stitch Regulator’

Recently, I was free motion quilting a baby quilt and I was interupted by skipped stitches. Everything would be perfect for a few inches and then I’d have to stop and rip. Since quilting is supposed to be fun (and this wasn’t), I did some research, started experimenting, and finally fixed the problem. Here’s what I learned – along with some words of wisdom from a few of my quilting friends.

What are Skipped Stitches?

The needle holes show where the stitches were skipped.

In free motion quilting, skipped stitches are when the needle carries the top thread into the quilt sandwich, but the thread does not form a stitch. The needle may leave a hole when it pulls out of the quilt, but the top thread also pulls out of the hole. Skipped stitches can come one at a time or several in sequence. I have a tolerance for one here and there, but groups look bad and I rip them out and try to figure out what’s causing the problem.

What Causes Skipped Stitches?

Skipped stitches are caused by incorrect timing in the stitch formation process. For stitches to form properly, the hook and needle’s bottom position must be timed just right. There are factors that can affect this:

  • How you prepare your sewing machine for free motion quilting
  • Thread size and quality
  • Needle size and type
  • Presser foot choice
  • Presser foot pressure
  • Your free motion quilting technique

As you make adjustments to solve the skipping problem, remember to change one thing at a time and test on a quilt sandwich that matches the quilt you’re working on.

Machine Preparation

Everything you need to clean your machine

  • Make sure the machine is threaded properly. This sounds simple, but a small oversight can cause big issues. Michele Scott, quilter, author, teacher, suggests turning the machine off and back on to restart or reboot to reset anything that may have become “goofy.”
  • Michele Scott also suggests trying a single hole or straight stitch throat (stitch) plate. The smaller opening leaves less room for the quilt to flap as the needle punctures the quilt sandwich, pushing it down and pulling it back up.
  • Reduce the top thread tension. Start with small changes, but don’t be afraid to approach zero. Just keep checking where the stitch locks (top thread with bobbin thread) to make sure you’re fixing your skipping problem and not causing a tension problem.
  • Make sure your feed dogs are down. I know, but check anyway. If you can’t cover them or lower them, then set the stitch length to zero to keep them from moving.
  • Make sure the needle is inserted completely and properly.
  • Clean the bobbin area and make sure there are no errant threads hiding there. Oil, if appropriate.
  • Victoria Findlay Wolfe, artist, quilter, and owner of Bumble Beans, Inc., suggests getting rid of all those dust bunnies hiding under your throat (stitch) plate. You may be surprised by how many you find!
  • Shannon Shirley, an award-winning quilter, says she gives her machine a good cleaning. Sounds like a great idea!

Thread

Successful combination of thread for this baby quilt

  • Use quality thread. This will cut down on lint (bonus!) and make a nicer stitch.
  • Try a different size thread. Sometimes really small threads can be too small to be caught by the hook. If this is consistently a problem, take your machine in to be serviced and explain the problem. This is an easy adjustment.  Try a thread that’s one step larger to see if this is the issue.
  • According to Kathy Lincoln, who teaches machine quilting, some batiks grab the thread fiber, interfering with good stitch formation. If batiks are giving you trouble, trying a finer thread could be the solution.

Needles

  • Dull or damaged needles can cause skipped stitches. Change your needle.
  • Use the right needle for your machine. I like Schmetz for my Bernina.
  • Microtex/Sharp needles work well with tightly woven fabrics, like batiks.
  • Topstitch needles have a bigger eye, which can be helpful if you are using larger thread.
  • Needles that are too small can cause flapping (why do they call it flagging?). Start with 80/12 and move up from there.
  • Kathy Lincoln says this about needles: It may seem counter-intuitive, but try going from a sharp point to a ball point needle. The ball point will separate the fibers instead of cutting through them.

Bernina presser feet, left to right: #15, #44c, BSR with clear plastic sole

Presser Feet

  • Start with whatever foot your machine manufacturer recommends. Generally, a darning foot is fine.
  • My Bernina foot #15 is my go-to foot for free motion quilting.
  • If flapping (flagging) becomes an issue, go for a foot that has more surface area, like Bernina’s #44. If you’re using the Bernina Stitch Regulator (the BSR), use the clear plastic sole. The idea is to provide as much coverage around the needle as possible to cut down on flapping.

Presser Foot Pressure

  • If the skipped stitches are caused by flapping, then increasing presser foot pressure can help reduce the flapping. While the presser foot does not actually ride on the fabric while you are free motion quilting as it does in regular sewing, increasing the pressure can limit the space within which the quilt sandwich can flap up and down.
  • Change presser foot pressure in small increments (On my Bernina, I change in increments of 5, starting with the default 50 setting) and test, test, test. For the batik baby quilt, I finally fixed the problem with a presser foot pressure set at 85.

Technique

  • Don’t push the fabric too fast. If you can’t slow your hand speed, then increase the machine speed.
  • Use your hands to keep the target section flat and firm (but not stretched or tight). I keep my hands flat, fingers at 12:00 and thumbs pointed toward each other at 3:00 and 9:00. Think of the stereotypical film director framing a shot with his hands. The area between my hands is where I stitch. Yes, you have to reposition your hands pretty often and, yes, it’s worth it.
  • Try to keep a steady, consistent speed.
  • Make a test sandwich out of the same materials you are using in your quilt. Test before you move to the quilt. Seriously. I like to skip this, but it’s best to play it safe. Use it to test tension and stitch quality.
  • I have an anonymous quilting buddy who says she switches off her machine and heads to the kitchen for an adult beverage. Hmm. That sounds like a plan. Take a break and start fresh later.

If nothing here works, then your machine timing may be off. You may need to take it in to your machine tech for service. Be prepared to sew at the shop and demonstrate the skipped stitches. Take your quilt or the test sandwich with you to the shop.

My baby quilt has a batik top, batik backing, and thin cotton batting. I was quilting on my Bernina 820 with Superior Threads’s King Tut (cotton 40-weight thread) in the top and Aurifil Mako (50-weight cotton thread) in the bobbin. The winning combination was a 90/14 topstitch needle, 1.25 top thread tension, the Bernina Stitch Regulator with the clear plastic sole set on BSR 1, and the presser foot pressure set at 85.  Now I just need to finish the binding!

For more information about this quilt, read my previous blog entry.

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I had a wonderful day today. I spent the work portion of the day at the local quilt shop where I am the Bernina manager and then I came home and worked on a very old Bernina for a neighbor.

Picture of Bernina 820

My 820

Let me start with this afternoon, when I was able to play with new machines. I worked with our Bernina tech on a client’s 820 (yes, I have an 820 at home), smoothing out some operational kinks. For those of you with 8 Series machines, a few tips: [Disclaimer: I am not a Bernina tech. These tips work for me, but they are not official Bernina recommendations.]

  • Don’t be afraid of bigger needles. I had a client who was repairing a microtex jacket using a satin stitch. She had tension and stitch width issues with an 80 universal needle, but all was wonderful with a 100 jeans needle.  Match the needle to the job. Keep in mind the needle may be larger than you would expect.
  • If your top thread is wound on the spool in flat rows, like Superior, Signature, or Sulky, you may run into some top tension issues. To avoid this, swing the multi spool holder out to the right and hook the thread on to an arm of the telescoping wand that is not directly above the spool. This should ensure that the thread pulls away from the spool rather than directly up where it can catch on the end of the spool and get hung up.
  • If you are freemotion quilting without your BSR, consider using a #15 foot. My tech just recommended this to me and I really like it. The opening is bigger and the front end is curved up ever so slightly. It makes all the difference.
  • If you are quilting with your BSR (8 Series machines only) and you are experiencing skipped stitches, you may need to have your spring replaced. Ask your tech; it’s an easy fix. My BSR functions beautifully now with the new spring.
Bernina 707 Minimatic

Neighbor's Bernina 707 Minimatic

When I got home tonight, I worked on an ancient Bernina for my neighbor. I should be careful who I call “ancient!” The machine was born in the 60’s and so was, well, never mind. My neighbor asked me to look at the tension because she was having trouble adjusting it. The machine is a gem! It’s a 707 Minimatic that was purchased in Africa. The manual is in Dutch, which my neighbor speaks, but I had to rely on the pictures. After a thorough cleaning and some oil, the machine is working again and the tension is perfect.

I wonder what tomorrow will bring.

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