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Inner band fatigue occurs when the stainless steel sealing strip inside a rodless cylinder cracks, deforms, or wears out due to repetitive cycling, debris accumulation, or improper tensioning, resulting in significant air bypass and system failure.

Introduction Your magnetically coupled rodless cylinder1 suddenly stalls mid-stroke, the carriage stops moving while the internal piston continues, and your entire production line grinds to a halt. 😱 This magnetic de-coupling event—when the magnetic connection “breaks”—costs you thousands in downtime, yet most engineers don’t understand the physics behind why it

Slit-type cylinder sealing relies on a precisely engineered steel band mechanism that opens and closes along the cylinder’s longitudinal slot, creating a dynamic seal that maintains pressure while allowing the piston to move freely. The opening band separates ahead of the piston carriage while the closing band reseals behind it, forming a continuous pressure barrier that prevents air leakage throughout the stroke.

Guide rail parallelism refers to the precise alignment of mounting surfaces and guide rails relative to the rodless cylinder’s axis of motion. When tolerances from the cylinder body, mounting brackets, machine frame, and guide rails accumulate (stack up), even minor deviations can cause binding, premature wear, and catastrophic failure.

A piston rod fracture typically results from either bending stress caused by misalignment and side loading, or tensile failure due to overloading and material fatigue. Understanding the fracture surface characteristics—such as crack patterns, texture, and deformation—is essential to identifying the root cause and implementing effective preventive measures.

Re-greasing intervals must be calculated based on operating conditions, not arbitrary calendar dates. Lubricant film breakdown occurs when grease degrades from mechanical shearing, oxidation, contamination, or depletion. Proper interval calculation considers stroke length, cycle frequency, load, temperature, and environmental factors. A cylinder running 10 cycles/minute in a clean environment might need re-greasing every 6 months, while one running 60 cycles/minute in dusty conditions may need it monthly.