Blade Breaking
A blade that breaks mid-cut stops production immediately, and the cause is rarely automatic. Breakage is one symptom that several conditions can produce; the checks below separate them before anything is concluded about the blade.
All TroubleshootingSymptoms
- Breakage at the weld joint
- Breakage in the blade body
- Breakage soon after a new blade is fitted
- Repeated breakage on the same machine
Possible causes
| Category | Possible cause | What to check |
|---|---|---|
| Machine | Tension set too high or too low for the blade and the machine. | Compare the tension actually set against the machine specification and the blade dimensions in use. |
| Guides | Worn or misaligned guide blocks or backer bearings let the blade move in the cut. | Inspect guide wear and alignment, and confirm the blade sits correctly in the guides. |
| Parameters | Feed rate or cutting speed outside the range the blade and material allow. | Compare the parameters used on this job against the recommendation for the material and section. |
| Blade | Tooth pitch or grade not matched to the material and the workpiece form. | Confirm grade, pitch and width against the material and the shape being cut. |
| Machine | Wheel condition or blade fatigue after extended service. | Inspect the wheels for damage and review how long the blade has been running. |
| Weld joint | A weld joint that does not hold under the load of the cut. | Note where the break occurred: a break at the weld points to the joint rather than to the tooth edge. |
Diagnostic steps
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Record where it broke
Weld joint, tooth edge or blade body — the break location narrows the possible causes before anything else is checked.
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Confirm the setting
Blade dimensions, tension and guide condition as they are on the machine now.
-
Review the cut
Material and grade, workpiece form, and the parameters used for this job.
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Compare with the previous blade
Whether the same specification ran on this machine before, and what changed since.
Information required
- Where the blade broke — weld joint, tooth edge or body
- How long the blade had been in use
- Blade dimensions, grade and tooth pitch
- Machine model and tension setting
- Material and grade being cut, and the workpiece form
- Cutting parameters in use before the break
When to contact us
Send the points above and, if possible, a photo of the broken blade. With the break location and the machine settings, the cause can usually be narrowed down without guessing — and without assuming that the blade is at fault.