As soon as you notice an unusual noise, stop. Continuing to sew can turn a minor issue into a more serious one.

• Turn the machine off before investigating
• Don't try to sew through the noise hoping it will resolve itself

A bent needle is one of the most common causes of unusual noise — it strikes the bobbin case, hook or needle plate on every single stitch, creating a sharp repetitive clicking sound.

• Remove the needle and inspect it for bending or damage
• Fit a fresh needle as a first step regardless — it's quick, free and rules out one of the most common causes immediately
• Make sure it's fully inserted with the flat side to the back and tightened securely

A grinding or clunking sound is often caused by a thread nest caught in the hook assembly forcing the machine to work against resistance.

• Remove the presser foot, needle plate and bobbin case and check carefully for any trapped thread or fabric
• Use small scissors or tweezers to clear any tangle — never pull aggressively
• Make sure the area is completely clear before reassembling

A rattling or clunking sound can be caused by something that's come loose during sewing.

• Check the needle plate screws are tight
• Make sure the presser foot is properly attached
• Re-seat the bobbin case and confirm it's locked in place

Lint and debris build up quickly and force moving parts to work harder, which can cause grinding or rasping sounds.

• Clean thoroughly around the bobbin area, feed dogs and hook assembly using a small brush
• Remove the needle plate if possible for a more thorough clean underneath

A squealing or persistent grinding sound can indicate the machine needs lubrication. This is particularly common if the machine hasn't been used for a while.

• Check your manual to see whether your machine requires oiling and exactly where to apply it — not all machines do and oiling the wrong parts can cause damage
• Use only sewing machine oil — never WD-40 or general household oils
• If your machine hasn't been serviced in a while, a professional service may be the most effective solution

Burrs or scratches on the needle plate can cause a regular catching or scraping sound as the needle passes through.

• Run your finger gently around the needle hole and feel for any rough spots
• Minor burrs can sometimes be smoothed with a fine file, but significant damage means the plate should be replaced

Once you've worked through the steps, sew a few lines on scrap fabric and listen carefully. The machine should run smoothly and quietly. If the noise has gone, you're good to return to your project.