Free Engineering Tool — #148
Pneumatic Cylinder Response Time Calculator
Estimate stroke time for pneumatic cylinders from bore, stroke, pressure, load, and port size using a simplified flow/force model.
Results
Simplified Stroke Time Model
The stroke time is primarily governed by the time required to fill the cylinder volume through the port restriction:
- V — swept volume = Abore × stroke
- Qport — flow capacity through port (function of port area and pressure)
- Pavg — average filling pressure (approximately 0.6–0.8 × Psupply)
⚠️ Note: This is a simplified model. Actual stroke time depends on valve switching time, tubing compliance, cushioning, friction, and back-pressure. Use for estimation only; validate with actual testing.
Stroke time ≈ Swept volume × P_abs / Port flow capacity. The port/valve size is typically the main bottleneck. Include tubing dead volume for accuracy.
Supply pressure, port/valve Cv, tubing diameter and length, bore size, stroke, load mass, friction, exhaust restriction, and back pressure all affect speed.
Use larger ports/valves, shorter/wider tubing, higher pressure, quick-exhaust valves, and reduce load. Quick-exhaust valves can dramatically improve retract speed.
Standard: 50–500 mm/s. High-speed: 500–3000 mm/s. With cushioning: 10–50 mm/s at stroke end. Flow controls allow fine tuning.
Cv represents flow capacity: the flow of water in US GPM at 1 psi drop. Higher Cv = more flow = faster cylinder. Kv (metric) = 0.865 × Cv. Match valve Cv to cylinder needs.
The procedures described on this page were developed and field-tested by the Vibromera team using the Balanset-1A, a portable dual-channel balancer and vibration analyzer for on-site rotor balancing.
Professional field balancing instruments. Used in 50+ countries.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
