Diaphragm Coupling vs Jaw Coupling
Diaphragm vs jaw coupling: diaphragm is zero-backlash, rigid, maintenance-free; jaw damps vibration with replaceable spider, lower cost. Torque, backlash, misalignment and cost compared.
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Zero-Backlash Couplings
What is a zero-backlash coupling? How backlash hurts positioning accuracy, and how diaphragm, jaw and bellows couplings achieve zero backlash for servos, encoders and CNC.
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Servo Motor Coupling Selection
Servo motor coupling selection: torque, bore, speed, stiffness and inertia — the five key factors, plus which type (diaphragm/jaw/bellows) fits servo best and the torque formula.
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Stepper Motor Coupling Selection
Stepper motor coupling selection: steppers have lower torque and vibration, so jaw or diaphragm couplings fit best. Bore, torque, damping tips, and stepper vs servo coupling differences.
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Coupling Misalignment Compensation
The three coupling misalignments — angular, parallel (radial) and axial — and their compensation limits. Max misalignment specs by coupling type, and how long diaphragm couplings compensate more.
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Coupling Torque Calculation
Coupling torque formula T=9550×P/n, rated vs peak torque, how to choose the service factor, and a worked sizing example.
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Stainless Steel Couplings
Stainless steel couplings for food, pharma, chemical and marine washdown environments. 304 vs 316 differences, CRO-FZG stainless jaw coupling specs, torque to 1040 N·m.
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Coupling Bore Size Selection
How to choose coupling bore size: match motor and load shaft diameters, keyway and custom bores, common sizes 3–78 mm.
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CNC Machine Coupling Selection
CNC coupling selection: feed axes use zero-backlash diaphragm couplings, spindles use high-torque steel diaphragm couplings. Torque, rigidity and accuracy requirements.
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Bellows Couplings
What is a bellows coupling? One-piece metal bellows, zero backlash, high rigidity, low inertia — for servos, encoders and CNC. Difference vs diaphragm couplings.
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Common Coupling Failures and How to Prevent Them
Most coupling failures are not the coupling's fault — they come from selection, installation or duty. Six typical failure modes (diaphragm fatigue cracking, elastomer wear, hub slipping, bore and keyway damage, loose fasteners, overload twist-off): causes, troubleshooting order and prevention.
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Coupling Inertia Matching on Servo Axes
On a servo axis the coupling does more than transmit torque — its inertia directly costs you response. The solid-cylinder formula J = ½mr², how to read the load-to-motor inertia ratio, aluminium versus stainless, and three rules for choosing a low-inertia coupling.
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