Sewing Machine Repair Library

The Sewing Machine Library

Learn from the repair bench.

Troubleshooting guides, deep dives and buying advice, written by the technicians at The Sewing Machine Shop in Walnut Creek. Find your problem, fix it at home, and understand why it happened.

By Cale & Dan Schoenberg · 46 articles · 6 subjects

Start here

Flow chartSkipped Stitches: The Troubleshooting Flow ChartSeven steps, in the exact order I work through them at the shop. Start at step one, test-sew, and move down the list until the skipping stops.Read the guideFlow chartWhy Does My Thread Keep Breaking?A five-step sequence for the most frustrating problem in sewing, from a fresh needle and quality thread to hunting down burrs.Read the guideStart hereHow a Sewing Machine Makes a StitchTwo shafts, one hook, one take-up lever. Understand the stitch cycle and every other article on this page makes more sense.Read the guide
01

Troubleshooting

Skipped stitches, loops, bird’s nests, puckering and other stitch problems, diagnosed the way a technician would.

10 articles

Flow chartSkipped Stitches Troubleshooting Flow ChartThe seven-step sequence for a machine that's skipping.ReadFlow chartWhy Does My Thread Keep Breaking?Five steps to find what's snapping your thread.ReadTroubleshootingChange Your Sewing NeedleWhy a bent or dull needle ruins stitches on even the finest machine.ReadTroubleshootingThe Pull Test: Loops on the Underside of FabricMy dad's one-minute test for a zero-tension condition.ReadTroubleshootingBird’s Nests & the Take-Up LeverThe most common cause of a tangle under your fabric.ReadTroubleshootingWhy Does My Straight Stitch Look Like a Zig-Zag?How the weave of the fabric deflects the needle, and the fix.ReadTroubleshootingTroubleshooting Loose StitchesMatching needle, fabric and thread for consistent knots.ReadTroubleshootingPuckered FabricWhy seams pucker and the three tools that stop it.ReadTroubleshootingDamaged Needle Plate: What Causes Needle Strikes?Needle deflection, burrs, and why to skip titanium needles.ReadTroubleshootingThe Needle Dropped Into My MachineWhat to do when a broken needle disappears inside.Read
02

Needles & Thread

Choosing, inserting and threading: the small decisions that make or break stitch quality.

8 articles

GuideSewing Machine Needles ExplainedReading a needle pack, sizes, points, and which needle for which fabric.ReadHow-toHow to Replace a Sewing Machine NeedleFlat to the back, all the way up, and don't over-tighten.ReadTechnician tipsPoor Quality Thread vs. High Quality ThreadHow cheap thread causes skipping, shredding and tension trouble.ReadGuideThe Ultimate Guide to Sewing Machine ThreadWeights, fibers and brands, for every kind of sewing.ReadTechnician tipsHow to Choose the Right Spool CapSlightly larger than the spool, never smaller, never way bigger.ReadTechnician tipsThe Problem of Sewing with AdhesiveHow sticky stabilizers and sprays cause skipped stitches.ReadHow-toHow to Use a Needle ThreaderHow the tiny hook works, and how to make it work for you.ReadHow-toNeedle Threaders, Part 2How to avoid bending the hook and ruining your threader.Read
03

Tension, Bobbins & Care

Keep the thread flowing freely: balancing tension, winding bobbins, and cleaning out the lint.

8 articles

GuideBalancing Sewing Machine TensionWhere the knot should sit, and how to get it there.ReadHow-toHow to Set Tension on a Sewing MachineUpper and bobbin tension, step by step.ReadDeep diveAutomatic Tension on Sewing MachinesWhat it is, how it works, and whether it's really automatic.ReadHow-toHow to Wind a BobbinThe one rule for a tight, even bobbin, and two tricks to get there.ReadHow-toHow to Clean a Sewing MachineFive key areas to clean at home, and yes, canned air is fine.ReadDeep diveThe Importance of an Unobstructed Thread PathOne principle behind dozens of stitch problems.ReadGuideSewing Machine OilWhich oil to use, where it goes, and how often.ReadFrom the benchThe Sewing Machine Technician’s ChecklistEverything we do when your machine is in for service.Read
04

How Your Machine Works

Under the covers: the parts and mechanisms behind every stitch.

7 articles

Start hereHow a Sewing Machine Makes a StitchThe two-shaft system and the full stitch cycle.ReadDeep diveThe 4 Hook Systems on Sewing MachinesDrop-in, vertical rotary, oscillating, and Bernina's B9.ReadDeep diveUnderstanding the Needle PlateWhat the needle plate reveals about the rest of your machine.ReadDeep diveWhat It Means When a Machine Is “Out of Time”Needle-hook timing vs. needle-feed timing.ReadDeep diveSewing Machine AnatomyHow every part connects to the next.ReadDeep diveSewing Machine Motors: Brushed vs. BrushlessWhat's actually driving your machine, and why it matters.ReadDeep diveDevelopments in Serger & Coverstitch TechnologyHow sergers and coverstitch machines have evolved.Read
05

Features & Techniques

The features worth paying for, and how to get the most out of them.

5 articles

GuideSewing Machine Walking Foot: The Definitive GuideHow a walking foot works and when you need one.ReadGuideGuide to Stitch RegulatorsEven free-motion stitches, and which machines offer them.ReadTechniqueFree Motion Quilting Tips & TricksSetup and practice tips for smoother free-motion work.ReadDeep divePowder-Coated Sewing MachinesMetal frames vs. plastic housings, and what it says about a brand.ReadGuideBernina: Demystifying Presser FeetMaking sense of Bernina's presser foot lineup.Read
06

Buying Guides & Brand History

Technician picks, head-to-head comparisons, and the stories behind the brands we sell.

8 articles

Buyer’s guideBest Sewing Machine for BeginnersFive technician picks for your first machine.ReadBuyer’s guideBest Sewing Machine for QuiltingThe machines we recommend to quilters, at every budget.ReadBuyer’s guideSergers: The Ultimate GuideWhat a serger does and how to choose one.ReadReviewsSewing Machine ReviewsOur technicians' take on the machines we sell.ReadComparisonJuki TL-18 vs. Juki TL-2010Two semi-industrial favorites, side by side.ReadComparisonBaby Lock Jubilant vs. Brother NS80Twin machines with two badges: what's actually different.ReadReviewBernina 990 Tell-AllA close look at Bernina's flagship.ReadHistoryThe History of Bernina Sewing MachinesBernina's fascinating trajectory over the past 60 years.Read

Still stuck?

Bring it to our repair bench.

If a guide doesn’t solve it, our technicians in Walnut Creek have been fixing sewing machines since the late 1980s. We’ll find the problem and get it stitching right again.

Book a repair(925) 937-7575
From the BenchDan Schoenberg’s printable repair articlesPDF guides from our chief technician on the most common problems he sees.The Sewing Machine NewsletterGet new articles by emailCale’s weekly newsletter on Substack, where every one of these articles starts.

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