Why Your Longarm Isn’t Stitching Right (And How to Fix It Today)
Longarm quilting can feel magical when everything is working the way it should. Smooth stitches, balanced tension, and a design that flows exactly the way you imagined. And then… something goes wrong. Suddenly you’re dealing with thread breaks, skipped stitches, or tension issues that make you question everything.
Here’s the good news: most longarm problems are not random. They have causes. And once you understand what’s really happening, they become much easier to fix.
This guide will walk you through the most common longarm quilting issues and how to troubleshoot them step by step. The goal is to help you feel more confident at your machine and spend less time feeling stressed out.
The Big Picture: Start Simple
Before diving into specific problems, there’s one rule that will save you a lot of time:
Change one thing at a time.
It’s tempting to adjust everything at once when something goes wrong, but that usually makes it harder to figure out what actually fixed (or caused) the issue. Slow down, make one adjustment, test it, and then move on if needed. Tip: write down what did and didn’t work. I keep a book of fixes next to my longarm.
Tension Problems
Tension is one of the most common challenges longarm quilters face. If you’re seeing thread knots, loops, or uneven stitches, tension is usually the culprit.
What to Look For
- Loops on the top or back of the quilt
- Thread nests or knots
- Uneven stitch appearance
What’s Really Happening
Tension is a balance between the top thread and the bobbin thread. If one is too tight or too loose, the stitches won’t lock properly in the middle of the quilt sandwich. Top thread pulling to the back- top tension is too loose or bobbin tension is too tight. Bobbin thread pulling to the top- top tension is too tight or bobbin tension is too loose.
How to Fix It
- Identify whether the issue is top or bobbin tension
- Adjust tension settings in small increments
- Mark your tension knobs so you can return to a known setting (Most longarms don’t have any markings on the tension knobs making it difficult to know how far they have been turned.)
- Test on a sample quilt sandwich before stitching on your project (must be same thread/fabric/batting as the quilt)
- Use a thread net or a piece of batting wrapped around the cone to keep slick threads from pooling (When thread pools it doesn’t feed through the tensioners evenly and causes knots on the back of the quilt.)
A Helpful Mindset
Tension isn’t about perfection. It’s about balance. Once you understand how your machine responds, it becomes much more predictable. Keep in mind that the tension is constantly changing as the bobbin thread is used up. No machine was designed to sew perfectly in a 360 degree circle. Using the same thread type, weight, and color on the top and in the bobbin will make your life much less stressful.
Thread Breakage
Few things are more frustrating than thread constantly breaking mid-design. It interrupts your rhythm and can leave visible breaks in your quilting where you have to stop and restart.
Common Causes
- Needle deflection (Anything that causes your need to bend slightly. This can cause the tread to catch or to rub against the needle plate.)
- Incorrect needle size to thread
- Thread type or weight mismatch
- Fabric or batting resistance
- cone vs spool
- Improper threading
How to Troubleshoot
Start with the basics:
- Rethread your machine completely
- Check that your needle is the correct size for your thread (obviously a thick thread won’t work with a small needle eye, but you shouldn’t use a thin thread with a large eye either.)
- Replace the needle if it’s been used for a while (Manufactures recommend every 8 hours of sewing, or if you hit something.)
- Make sure your thread is feeding smoothly (generally cones are designed to sit upright while spools are design to load horizontally)
Don’t Overlook Materials
Batting and fabric matter more than people realize. Batiks or high thread count material can cause needle deflection. Certain recycled battings can be hard on cotton thread. Cotton thread has a lower melting coefficient than poly so you need to slow down when quilting with cotton.
Skipped Stitches vs Encoder Problems
When you have uneven stitch length and you are using a stitch regulated machine it is caused by one of two things. First, skipped stitches easily identified by the needle hole under the long stitch where the top thread did not catch the bobbin thread. Second, encoder problems. Encoders are what tell your stitch regulator how fast your machine is moving. Encoder problems will not have a needle hole just a really long stitch.
Likely Causes Skipped Stitches
- Needle deflection
- Mismatch between thread and needle size
- Quilt sandwich too tight
Likely Causes Encoder problem
- old or damages “0” ring
- encoder not positioned correctly on the wheel (I’ve moved mine to clean and forgot to tip it back. This will scare you to death as your machine suddenly won’t sew in one direction)
- Something on the track or wheel that causes the encoder to loose contact
What to Check
- Replace your needle first
- Confirm your needle size matches your thread
- Check your quilt tension on the frame (too tight can restrict movement)
- Clean tracks and wheels
- Check “0” rings
A Quick Tip
If your machine feels like it’s fighting you, it probably is. Stop and look for a problem don’t just keep sewing! Smooth movement is key to consistent stitches.
Batting Issues
Batting plays a bigger role in your quilting than many people expect.
Common Problems
- Bearding (fibers poking through the quilt top)
- Wrinkles or shifting
- Thickness affecting stitch quality
What Helps
- Choose batting with a scrim or needle-punched structure to reduce bearding
- Smooth out wrinkles before quilting (I toss heavily wrinkled batting in the dryer with a damp cloth before loading on the machine to get rid of wrinkles.)
- Use a thicker batting if you really want to use a different thread on the top from what’s in your bobbin.
A Reality Check
Not all batting behaves the same. Testing combinations of thread, needle, and batting can save you from surprises later.
Extra Fullness in the Quilt Top
Have you ever noticed areas of your quilt top that seem to puff up or ripple as you quilt? That’s extra fullness. Contrary to popular belief it is not actually possible to quilt something out. This is not an air bubble on your phones screen protector you’re trying to get rid of. It’s fabric and it has to go somewhere. Just like in life, if you keep pushing your problems away, they only get bigger.
Why It Happens
- Inaccurate piecing
- Handling the fabric too much (“petting” the quilt)
- Stretching the quilt during quilting
How to Manage It
- Use the belly bar to line up a sashing strip or seam and then ease any fullness into that areal. Don’t smooth towards the bottom as you are only making a bigger problem for later on.
- Quilt problem areas “in” (Quilt around problem areas and then work in whatever fullness is left using dense quilting and if necessary, a judicious tuck.
- Avoid over-handling the fabric (We love our fabric, but don’t “pet” it until after it’s quilted.)
- Always baste from the belly bar up to the take up bar. This helps avoid stretching out the border edges.
- Keep quilting density consistent across the quilt
A Simple Shift
Think of quilting as guiding the fabric, not pushing it. The less you fight it, the smoother your results.
Timing Issues
When people talk about timing they are referring to the position of the sewing hook to the eye of the needle. If they don’t meet up at the correct “time” a stitch will not be formed. Timing is often blamed when things go wrong, but it’s usually not the first place to look. Unless you sewed over something, or your machine was incorrectly set up in the first place, it’s probably not a timing issue. (Easy way to tell if it’s a timing issue: rotate your needle to the full down position. The hook should be splitting the “eye” of the needle.)
Key Points
- Timing problems don’t just happen randomly
- They’re often caused by hitting something or mechanical damage
When to Check Timing
Only after you’ve ruled out:
- Needle issues
- Threading problems
- Tension adjustments
If You Suspect Timing
This is usually when it’s time to consult a technician, depending on your machine brand, unless you are really handy.
Bobbin Issues: Small Part, Big Impact
Bobbins may be small, but they have a huge effect on stitch quality. I do not recommend using the drop test to test for bobbin tension. This doesn’t check how it responds in real world situations. I’ve had a bobbin that has expanded over time do to metal fatigue. It feels fine with the drop test, but won’t actually move when it is in the machine because of the extra thickness. Nor will the drop test detect if a bobbin is out of round which will cause major tension problems.
Common Problems
- Inconsistent tension (Bad tension spring. Like anything else made of metal they are subject to metal fatigue and will wear out.)
- Uneven winding (I highly recommend a stand alone bobbin winder. Don’t forget to oil this too.)
- Lint buildup (It doesn’t take much, if it’s in just the right place.)
- Backlash issues (Your anti backlash disc is worn out.)
What to Do
- Use a bobbin tension gauge (more reliable than the drop test)
- Clean the bobbin area regularly
- Replace worn discs and springs
- Adjust tension based on thread type (Write it down!)
A Helpful Reminder
Different threads require different tension settings. There’s no one-size-fits-all solution.
Machine Maintenance
Many quilting problems come down to maintenance, or lack of it.
What to Watch For
- Lint buildup
- Lack of oil
- Burrs on metal parts
- Wear and tear over time
Best Practices
- Clean your machine regularly
- Oil as recommended by your manufacturer
- Check for rough spots or damage
- Keep tracks and wheels clean
A Simple Truth
A well-maintained machine performs better. Every time.
Putting It All Together
When something goes wrong with your longarm quilting, it’s easy to feel overwhelmed. But most problems come down to a handful of variables:
- Needle
- Thread
- Tension
- Materials
- Machine setup
If you work through those methodically, you can solve almost anything.
Want to Go Deeper?
Troubleshooting is one of those skills that gets easier with experience. The more you understand how your machine works, the faster you can diagnose and fix problems.
If you’ve ever wished you could:
- Know exactly what to adjust (and when)
- Stop guessing and start understanding
- Quilt with more confidence and less frustration
That’s exactly what I focus on in my classes.
We go beyond just fixing problems. I show you how to read your stitches, understand what your machine is telling you, and make adjustments with confidence.
Because quilting should feel creative and enjoyable—not like a constant battle with your machine.
If that sounds like something you’re ready for, take a look at my upcoming classes and workshops. It might just change the way you quilt.
This article may include affiliate links for which I might receive a small compensation.
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Why Your Longarm Isn’t Stitching Right Why Your Longarm Isn’t Stitching Right Why Your Longarm Isn’t Stitching Right Why Your Longarm Isn’t Stitching Right
Why Your Longarm Isn’t Stitching Right Why Your Longarm Isn’t Stitching Right Why Your Longarm Isn’t Stitching Right Why Your Longarm Isn’t Stitching Right
Excellent content and clear definition in both problem and solution!
Thank you so much. Glad you liked it.