- Changing after using 3-4 bobbin threads on a project.
- Replace it after continuously using the machine for 8 hours.
- Replace it each time you feel the needle has a burr or gets blunt.
about eight hours
Why can't a sewing needle be predetermined?
Gruchow concludes that because there are so many variables, which differ operator-to-operator and project-to-project, the life of a sewing needle “cannot be predetermined.”.
How long does it take for a needle to dry?
Horst Gruchow, a technical services manager for Schmetz Needles, estimates it’s “between one minute and one month.”
How long can you go without changing a needle?
Still, he maintains a good rule of thumb is to never go longer than a month without changing a machine’s needle.
