If your sewing machine suddenly starts skipping stitches, breaking thread, or failing to pick up the bobbin thread, there’s a good chance your timing is off.

Timing issues are one of the most misunderstood sewing machine problems — but once you understand what’s happening, diagnosing it becomes much easier.

In this guide, you’ll learn:

• What sewing machine timing actually is
• The exact symptoms of timing problems
• What causes timing to go out
• How to fix it (and when not to)

What Is Sewing Machine Timing?

Sewing machine timing refers to the precise synchronization between the needle and the rotary hook.

For a proper stitch to form:

• The needle must descend and begin rising
• The hook must pass behind the needle at the exact moment
• The hook catches the thread loop and forms the stitch

If this timing is off — even slightly — the stitch will fail.

Common Symptoms of Timing Issues

1. Skipped Stitches

This is the most common sign.

The needle moves, but:

• The hook misses the thread loop
• No stitch is formed

2. Machine Not Picking Up Bobbin Thread

You try to pull up the bobbin thread, but nothing happens.

This usually means:

• The hook is arriving too early or too late

3. Thread Breaking Frequently

When timing is off, the thread can:

• Catch incorrectly
• Snap under tension

4. Grinding or Knocking Sounds

If parts are slightly out of sync, they may:

• Rub
• Tap
• Create mechanical noise

👉 If you're hearing this, read this!

5. Needle Hitting the Bobbin Area

In severe cases:

• The needle may strike the hook or plate
• This can cause permanent damage

What Causes Timing to Go Out?

1. Needle Strikes (Most Common Cause)

Hitting:

• A pin
• Thick fabric
• The needle plate

…can knock timing slightly out of alignment.

2. Worn or Loose Internal Components

Over time:

• Screws loosen
• Components shift

This affects synchronization.

3. Hook or Bobbin Case Damage

Damage in the hook area can disrupt timing.

👉 How to tell if your bobbin case is bad 

👉 Signs your rotoray hook is damaged

4. Improper Maintenance

Lack of:

• Cleaning
• Lubrication

…can create resistance and throw timing off.

5. Forcing the Machine

Pulling fabric or forcing thick materials can:

• Shift internal alignment
• Damage timing components

How to Diagnose Timing Issues

Quick Test

1. Turn the handwheel slowly toward you
2. Watch the needle go down and begin rising
3. Look at the hook position

The hook tip should pass:

• Just behind the needle
• Slightly above the needle eye

If not — timing is off.

Can You Fix Sewing Machine Timing Yourself?

Basic Machines

Some mechanical machines allow:

• Minor timing adjustments
• Accessible screws

However…

Most Modern Machines

Timing adjustments require:

• Opening the machine
• Precise alignment tools
• Technical experience

Incorrect adjustment can make the problem worse.

When to Replace Parts vs Adjust Timing

Sometimes the issue is NOT timing — it’s a worn component.

Check these first:

• Bobbin case condition
• Rotary hook wear
• Needle plate damage

If parts are damaged, replacing them may fix the issue without adjusting timing.

When to Seek Professional Repair

You should NOT attempt timing repair if:

• The machine is computerized
• The needle is hitting internal parts
• The issue persists after cleaning and part replacement

How to Prevent Timing Problems

• Never sew over pins
• Use correct needle size
• Avoid forcing fabric
• Clean regularly
• Replace worn parts early

Final Thoughts

Sewing machine timing is all about precision and synchronization.

Even a slight misalignment can cause major issues — but in many cases, the root problem is something simpler like:

• A damaged bobbin case
• A worn hook
• A bent needle plate

Understanding the difference can save you time, money, and frustration.

If you're troubleshooting your machine, explore ThreadWorks for:

• Exact replacement parts
• Detailed compatibility listings
• Solutions designed to get your machine running right

Related Guides

• Why Is My Sewing Machine Making a Grinding Noise?
• How to Tell If Your Bobbin Case Is Bad
• Signs Your Rotary Hook Is Damaged