Sep 07, 2026
Quick Reference Answer The main types of cylinders used in industrial actuation are pneumatic cylinders (air-powered, fast and clean), hydraulic cylinders (oil-powered, highest force), and electric cylinders in several sub-categories. A linear cylinder is the broad family name for any actuator that produces straight-line (linear) motion. An Electric Linear Cylinder converts electric motor rotation into linear rod extension through a ball screw or lead screw mechanism, providing precise position control with position repeatability of 0.01 to 0.1 mm and no fluid contamination risk. An electric over hydraulic cylinder uses an electric motor to drive an integrated hydraulic pump, delivering full hydraulic force output ( up to 500 kN or more ) with the control flexibility of electric operation and without a separate hydraulic power unit. A heavy duty electric cylinder is an electric linear actuator engineered for continuous high-force applications requiring loads of 50 kN to 300 kN or above , used in steel mills, hydraulic press replacement, and heavy transport systems. An electric servo cylinder is an Electric Linear Cylinder driven by a servo motor with closed-loop position, velocity, and force control, offering the highest precision and the most sophisticated motion profiles of any cylinder type. An electric pneumatic cylinder refers either to an electro-pneumatic cylinder (a pneumatic cylinder with an integrated electric solenoid valve and position feedback) or to an electric actuator designed to be a drop-in replacement for a pneumatic cylinder in retrofit applications. Types of Cylinders: The Complete Classification and Comparison Understanding the full landscape of types of cylinders available for industrial motion applications is the essential starting point for selecting the correct actuator for any project. The word "cylinder" in engineering refers to any actuator that produces linear (straight-line) motion by pushing or pulling a rod or plunger, regardless of the energy source. The primary classification of cylinder types is by the energy source used to create force: pneumatic (compressed air), hydraulic (pressurised oil), and electric (motor-driven mechanical conversion). Within the electric category, several important sub-types exist that are increasingly displacing both pneumatic and hydraulic cylinders in precision and safety-critical applications. Pneumatic Pneumatic Cylinder Energy: compressed air (5 to 10 bar) Force: up to 50 kN typical Speed: very fast (up to 3 m/s) Position control: limited (end stops) Best for: fast cycling, clean environments Hydraulic Hydraulic Cylinder Energy: pressurised oil (100 to 700 bar) Force: up to 50,000 kN Speed: moderate (up to 0.5 m/s typical) Position control: moderate (with servo valve) Best for: extreme force, heavy construction Electric Electric Linear Cylinder Energy: electrical (24V DC to 480V AC) Force: 0.1 kN to 300 kN Speed: 0.001 to 1 m/s (configurable) Position control: excellent (0.01 mm) Best for: precision, clean-room, automation Why the Shift from Fluid Power to Electric Cylinders Is Accelerating Across virtually every sector of manufacturing and industrial automation, the past decade has seen a consistent trend toward replacing pneumatic and hydraulic cylinders with electric alternatives wherever the force and speed requirements permit. This shift is driven by five converging pressures: Energy efficiency: A typical compressed air system converts only 8 to 12% of the electrical input energy to useful mechanical work at the cylinder, with the remainder lost to compressor heat, pipe leakage, and pressure drops. An electric linear cylinder system converts 75 to 92% of electrical input to useful mechanical work , making it 7 to 10 times more energy efficient per unit of mechanical output. Precision requirements: Modern automation, battery manufacturing, pharmaceutical production, and electronics assembly require position repeatability that pneumatic cylinders cannot deliver without expensive servo pneumatic systems. Electric cylinders provide this precision as a baseline capability without additional cost. Cleanliness and contamination: Food processing, medical device manufacturing, and semiconductor production require zero risk of fluid contamination. Pneumatic cylinders exhaust air (which may carry oil mist from lubricated compressors), and hydraulic cylinders carry constant oil contamination risk. Electric cylinders operate completely dry with no fluid in or near the process. Data and diagnostics: Industry 4.0 and smart manufacturing require actuators that can report their own health and performance data. Electric cylinders equipped with encoders and force sensors are inherently data-generating devices; pneumatic and basic hydraulic cylinders require extensive additional instrumentation to provide comparable information. Reduced infrastructure: Pneumatic systems require a compressor, air dryer, filter-regulator-lubricator units, and a distribution network of pipes. Hydraulic systems require a power unit, oil reservoir, heat exchanger, filtration, and pipe or hose distribution. Electric cylinder systems require only electrical cables and a controller, dramatically reducing installation cost and maintenance burden. Comparison of the main types of cylinders across key performance and operating criteria for industrial automation selection Criterion Pneumatic Hydraulic Electric Linear Electric Servo Maximum force 50 kN 50,000 kN 300 kN 300 kN Position accuracy ±0.5 to ±5 mm ±0.1 to ±1 mm ±0.01 to ±0.1 mm ±0.005 to ±0.05 mm Energy efficiency 8 to 12% 50 to 70% 75 to 90% 80 to 92% Contamination risk Oil mist possible High (oil leaks) None None Speed capability Up to 3 m/s Up to 0.5 m/s Up to 1 m/s Up to 1 m/s Force control Poor Good Good Excellent Stroke range Up to 2,000 mm Up to 10,000 mm Up to 3,000 mm Up to 2,000 mm Infrastructure required Compressor, piping HPU, piping Electrical cables only Electrical cables only Electric Linear Cylinder and Linear Cylinder: Core Technology and Construction A linear cylinder is the generic term for any actuator producing linear motion. In the electric domain, the Electric Linear Cylinder is the workhorse of modern precision actuation, converting rotary motor motion into linear rod movement through a mechanical transmission. Understanding the mechanical conversion mechanism is essential because the choice of screw type determines the actuator's efficiency, speed, force, and service life. Ball Screw Drive The most common drive mechanism for precision Electric Linear Cylinders . A hardened and ground steel screw with circular cross-section thread profile is engaged by a nut containing recirculating steel balls. The ball contact replaces sliding contact, reducing friction coefficient from 0.1 to 0.3 (lead screw) down to 0.003 to 0.01 (ball screw) and boosting efficiency to 90 to 98% . Efficiency: 90 to 98% Back-drivable: yes (requires brake for holding) Typical life: 10,000 to 100,000 km travel Best for: precision, speed, frequent cycling Lead Screw (ACME) Drive A trapezoidal-thread screw and bronze or plastic nut with sliding contact between the screw flanks and nut threads. Lower efficiency than ball screws ( 25 to 70% ) but inherently self-locking at low lead angles, meaning the actuator holds its position without a brake when power is removed. This self-locking property makes lead screws the preferred choice for applications requiring fail-safe position holding. Efficiency: 25 to 70% Back-drivable: no (self-locking) Typical life: 1,000 to 10,000 km travel Best for: holding loads, slow duty, low cost Roller Screw Drive Planetary rollers threaded to mesh with the screw provide far greater contact area than a ball screw, enabling substantially higher load capacity and longer service life at the same screw diameter. Used in heavy duty electric cylinders where the force exceeds the practical capacity of ball screws. Efficiency is 80 to 90% , slightly less than ball screws but far superior to lead screws at equivalent loads. Efficiency: 80 to 90% Back-drivable: yes Typical life: 100,000 to 1,000,000 km Best for: heavy loads, long duty cycles Standard Electric Linear Cylinder Specifications and Sizing Parameters When specifying an Electric Linear Cylinder or linear cylinder for an application, the following parameters must be determined: Thrust force (push and pull): The maximum force the cylinder must exert in both extension and retraction directions. For ball screw and roller screw cylinders, push and pull force capacity are typically equal. For lead screw cylinders, pull force capacity may be somewhat less than push force due to column buckling being the limiting factor for long strokes. Stroke length: The total distance of rod travel from fully retracted to fully extended. Standard commercial Electric Linear Cylinder products are available in stroke increments of 50 mm up to 2,000 mm or more. Longer strokes require larger screw diameters to prevent buckling and resonance, which increases cost and weight significantly beyond approximately 1,200 mm stroke. Speed (extension and retraction): The rate of rod movement in mm/s or m/min. Speed and force are inversely related in an electric cylinder: a given motor power can deliver either high force at low speed or lower force at high speed, following the power equals force multiplied by speed relationship. A cylinder delivering 10 kN at 100 mm/s requires 1,000 watts of mechanical power , which determines the motor size needed. Duty cycle: The fraction of time the cylinder is actively moving relative to the total cycle time, expressed as a percentage. A cylinder that extends in 2 seconds, dwells for 8 seconds, and retracts in 2 seconds has a duty cycle of (2 2)/(2 8 2) = 33% . High duty cycle applications generate more heat in the motor and screw mechanism and require derating of the continuous force rating compared to the peak rating. Continuous duty (100%) ratings are typically 50 to 70% of the peak force rating for the same cylinder. Mounting and rod end configuration: Linear cylinders are mounted using flange mounts (front or rear), trunnion mounts (pivot about the cylinder midpoint), and clevis mounts (pivot at rear). Rod ends use internal thread (FI or MS thread), external thread, rod eye (clevis), or spherical rod eye (for angular misalignment). The mounting configuration determines whether the cylinder must handle side loads, and side loads require additional anti-rotation guidance (either integrated guide rods or a separate guide system). Electric Over Hydraulic Cylinder: Combining Hydraulic Force with Electric Control The electric over hydraulic cylinder (also called an electrohydraulic actuator or self-contained electrohydraulic actuator, SCEHA) is a hybrid technology that integrates an electric motor, a hydraulic pump, a small oil reservoir, and a hydraulic cylinder body into a single self-contained assembly. It delivers the full force density of hydraulic actuation without requiring an external hydraulic power unit (HPU) or a complex hydraulic distribution system. The result is a unit that can be installed anywhere power cables can reach, with the hydraulic system completely sealed and self-contained within the actuator body. Electric Motor drives Hydraulic Pump pressurises Hydraulic Cylinder All enclosed within one sealed housing Force Range 10 kN to 2,000 kN Operating Pressure 140 to 700 bar internal Position Accuracy ±0.1 to ±0.5 mm Self-Locking Yes (trapped oil locks position) Power Supply 230V single or 400V three-phase AC External Pipework None required Where Electric Over Hydraulic Cylinders Replace Conventional Hydraulic Systems The electric over hydraulic cylinder is particularly well-suited to applications where the hydraulic force density is required but the installation of a conventional hydraulic system is impractical, expensive, or creates maintenance burdens that are unacceptable. Key application categories: Retrofit upgrades: Replacing the hydraulic power unit and distribution system of an ageing hydraulic machine with an electric over hydraulic cylinder at each cylinder position eliminates the HPU, reduces oil volume from hundreds of litres to a few litres total across all actuators, and removes the risk of systemic hydraulic circuit contamination or failure. Offshore and marine applications: Offshore platforms and marine vessels require actuators for hatches, ramps, ballast valves, and stabiliser systems in locations where running hydraulic pipework is expensive, corrosion-prone, and creates serious environmental risk from potential oil spills. The self-contained nature of the electric over hydraulic cylinder eliminates external hydraulic circuit exposure entirely. Agricultural and mobile machinery: Tractors, combine harvesters, and other agricultural equipment have limited hydraulic capacity from the vehicle's power take-off hydraulic circuit. Adding auxiliary actuators without overloading the vehicle's hydraulic circuit is solved by specifying electrically powered electric over hydraulic cylinders for the auxiliary functions, leaving the vehicle's primary hydraulic circuit free for its primary functions. Stadium and entertainment venue roof and seating systems: Large architectural actuators for retractable roofs, moveable seating platforms, and stage lifts in entertainment venues require very high force but are located where extensive hydraulic pipework would be both expensive and creating unacceptable maintenance access challenges. Self-contained electric over hydraulic cylinders rated to 500 to 2,000 kN are used in these applications. Heavy Duty Electric Cylinder: High-Force Electric Actuation Replacing Hydraulics The heavy duty electric cylinder is an electric linear actuator engineered specifically for the high-force, high-duty-cycle, and harsh-environment requirements of heavy industrial applications that have historically been dominated by hydraulic cylinders. By combining a high-power three-phase induction or permanent magnet servo motor with a large-diameter roller screw or ball screw, the heavy duty electric cylinder achieves force outputs of 50 kN to 300 kN (with some specialist designs reaching 1,000 kN or more) while maintaining the clean, efficient, precisely controlled operation that defines the electric actuation category. Construction Features That Distinguish Heavy Duty Electric Cylinders A heavy duty electric cylinder differs from a standard electric linear actuator in its engineering margins and construction details: Roller screw as standard: At force outputs above approximately 50 kN, ball screws reach the practical limit of their load capacity in reasonable screw diameters (typically 40 to 63 mm for ball screws, requiring very large diameter and heavy construction). Planetary roller screws carry the same load with a smaller screw diameter because the load is distributed across many roller contact lines rather than a limited number of balls. Heavy duty electric cylinders above 50 kN almost universally use roller screw drives rated for millions of kilometres of travel life under rated load. Integrated anti-rotation guide: At high thrust forces, any torque component applied to the cylinder rod (from off-centre loading or angular mounting) would rotate the screw nut if unrestrained, causing irregular motion and accelerated wear. Heavy duty cylinders integrate a robust anti-rotation system (typically a guide rod running parallel to the main screw, or a non-circular section on the rod that engages a matching bore in the front flange) to prevent this rotation under the highest practical side loads. IP65 to IP67 environmental sealing: Heavy industrial environments expose actuators to metal chips, coolant, hydraulic oil mist, and water wash-down. Heavy duty electric cylinders use labyrinth seals, wiper seals, and sealed motor enclosures to maintain protection class IP65 (dust-tight and water-jet resistant) or IP67 (immersion to 1 metre depth for 30 minutes). This sealing eliminates the ingress of contaminants that would rapidly destroy precision screw mechanisms if unsealed. Integrated electromagnetic brake: Because roller and ball screws are back-drivable, a heavy duty electric cylinder holding a large load (such as a press platen weighing several tonnes) will retract if power is lost without a brake. An integrated electromagnetic (spring-applied, power-released) brake engages automatically when power is removed, holding the rod position with no electrical power required. The brake holding force must exceed the maximum back-drive force from the rated load. Heavy Duty Electric Cylinder Applications in Steel, Mining, and Press Industries The leading application areas for heavy duty electric cylinders in the transition away from hydraulics include: 01 Steel Rolling Mills Roll gap adjustment in cold and hot rolling mills requires forces of 100 to 500 kN applied with position accuracy of 0.05 to 0.1 mm at update rates of 100 Hz or faster. Electric servo cylinders with roller screws are replacing traditional hydraulic adjustment cylinders in rolling mills because they provide faster response, better accuracy, and eliminate oil contamination of the steel surface. 02 Hydraulic Press Replacement Metal forming presses that previously used 100 to 300 kN hydraulic cylinders are being converted to heavy duty electric cylinders for the energy efficiency improvement (saving 40 to 70% of operating energy ), improved press force profile control, and elimination of hydraulic oil from food and pharmaceutical packaging environments. 03 Mining Equipment Underground mining roof support systems, ore hopper gates, and conveyor tension systems are transitioning to heavy duty electric cylinders in battery-electric mine vehicle programs, where eliminating hydraulic infrastructure simplifies the vehicle design and removes the fire risk associated with hydraulic oil in confined underground spaces. 04 Ship Stabilisers and Marine Ramps Ferry and cruise ship vehicle ramps, stabiliser fin actuators, and cargo door actuators requiring forces of 50 to 500 kN in corrosive marine environments benefit from heavy duty electric cylinders because they eliminate hydraulic oil from areas near the waterline where leaks would cause marine environmental violations. Electric Servo Cylinder: Maximum Precision Through Closed-Loop Control An electric servo cylinder is an Electric Linear Cylinder in which the driving motor is a servo motor connected to a servo drive (amplifier) that implements closed-loop feedback control of position, velocity, and force simultaneously. The addition of the servo control system transforms the actuator from a simple electromechanical device into a fully programmable motion axis capable of executing complex motion profiles with extraordinary precision and repeatability. What Makes an Electric Servo Cylinder Different from a Standard Electric Cylinder A standard Electric Linear Cylinder with a stepper motor or a variable speed AC motor provides open-loop or simple closed-loop position control, typically using a limit switch or a linear potentiometer for feedback. An electric servo cylinder adds: High-resolution encoder feedback: A servo motor encoder (typically 17 to 24-bit resolution, providing 131,072 to 16,777,216 counts per revolution ) allows the servo drive to know the motor's angular position to a fraction of an arc-second, which translates to nanometre-level resolution at the cylinder rod when combined with a fine-pitch screw. High-bandwidth control loop: The servo drive's position, velocity, and current (torque) control loops update at rates of 1 to 16 kHz , detecting and correcting position errors faster than any mechanical disturbance can accumulate. This high bandwidth produces the stiffness needed to hold a precise position against varying external forces without position drift. Programmable motion profiles: The servo controller can execute S-curve, trapezoidal, or custom velocity profiles that accelerate and decelerate the load smoothly, minimising mechanical shock and vibration. This is critical for precision assembly processes, scientific instruments, and measurement systems where abrupt acceleration would disturb sensitive components or measurements. Force control mode: By monitoring motor current (which is proportional to motor torque, which multiplied by the screw lead equals thrust force), the servo drive can regulate the force applied by the cylinder rod to a set value, regardless of position. This torque-to-force mode is used for pressing, clamping, and joining operations where a controlled force (not a controlled position) is the required output. Integrated process monitoring: The servo drive continuously logs position error, current, velocity, and temperature data. This data can be analysed by process monitoring software to detect tool wear, joint quality in press-fit assembly, material property variations in forming operations, and imminent mechanical faults before they cause a failure. Electric Servo Cylinder Applications in Precision Manufacturing Electric servo cylinders are the dominant actuator choice in precision manufacturing applications where position accuracy below 0.1 mm and force repeatability within 1 to 5% are required: Battery cell assembly: Electrode stacking, cell welding, and electrolyte injection in lithium-ion battery manufacturing require position accuracy of 0.05 to 0.1 mm and force control within 2% to prevent electrode deformation that causes cell capacity loss or internal short circuits. Semiconductor packaging: Wire bonding, flip-chip attachment, and package compression testing require servo cylinder motion resolution of 1 to 10 micrometres and force control in the range of 0.1 to 10 N, where conventional electric cylinders lack the precision and pneumatic cylinders lack controllability. Automotive assembly: Press-fit bearing and bushing installation, seat track adjustment systems, sunroof actuators, and door hinge torque testing all use electric servo cylinders for their combination of high force, precise stroke control, and process data logging that enables 100% quality verification of every assembled joint. Medical device assembly and testing: Implantable device crimping, stent deployment testing, and syringe pump actuation use servo cylinders with force accuracy of 0.5 to 1% and stroke accuracy of 0.01 to 0.05 mm in clean-room environments where hydraulic actuators are absolutely excluded. Electric Pneumatic Cylinder: Electrifying Pneumatic Systems and Drop-in Replacements The term electric pneumatic cylinder is used in two distinct contexts in industrial practice, and understanding both is important for selecting the correct product. The first context is an electro-pneumatic cylinder: a conventional pneumatic cylinder fitted with an integrated proportional solenoid valve and position feedback sensor, creating a pneumatic actuator with electric position control. The second context is an electric actuator specifically designed as a dimensional and functional drop-in replacement for a standard ISO pneumatic cylinder, fitting the same mounting, having the same rod diameter and thread, and being controllable from the same signal that previously drove the solenoid valve. Electro-Pneumatic Cylinders: Adding Precision to Compressed Air Systems An electro-pneumatic version of the electric pneumatic cylinder retains compressed air as its energy source but replaces the simple on-off solenoid valve with a proportional valve that can meter airflow to any fraction of maximum flow based on an electrical control signal (typically 4 to 20 mA or 0 to 10V DC). Combined with a linear position sensor (magnetic strip or optical scale) on the cylinder body, the proportional valve receives feedback-corrected commands from a position controller, creating a closed-loop pneumatic servo system. Electro-pneumatic servo systems can achieve position accuracy of ±0.1 to ±0.5 mm depending on the cylinder friction, load characteristics, and controller tuning. This is significantly better than the end-stop-only positioning of a conventional pneumatic cylinder but falls short of the ±0.01 mm achievable with an electric servo cylinder . The advantage is that the existing compressed air infrastructure is retained, which may be economically decisive when a large facility has a compressed air system already paid for and maintained. Electric Drop-In Replacement Cylinders: Eliminating Pneumatics Without Redesigning the Machine Electric actuators designed as drop-in replacements for ISO pneumatic cylinders represent one of the most commercially active segments in the electric actuation market. These products are dimensioned to match ISO 15552 or ISO 6432 pneumatic cylinder mounting standards, with the same tie-rod mounting pattern, the same piston rod diameter and thread, and the same clevis and foot bracket interfaces as the pneumatic cylinders they replace. The replacement process involves: Remove the pneumatic cylinder from its mounting brackets and disconnect its air supply hoses and solenoid valve wiring. Mount the electric replacement cylinder using the same mounting brackets and the same bolt pattern. Connect the electric cable from the replacement cylinder to a 24V DC power supply or directly to the machine's control panel where the solenoid valve was previously connected (for versions designed to accept direct 24V solenoid-equivalent signals). Adjust the controller parameters (speed, acceleration, end-of-stroke detection) through the cylinder's integrated controller interface. Cap the air supply ports no longer needed, and isolate the relevant section of the compressed air circuit if this cylinder was the only user in its branch. The energy saving from this retrofit is immediately measurable. A single electric pneumatic cylinder replacement eliminates the compressed air consumption of that cylinder, which for a cylinder cycling 60 times per minute with 100 mm stroke and 63 mm bore could be 80 to 120 litres per minute of compressed air at 6 bar , equivalent to approximately 0.5 to 0.8 kW of compressor power running continuously. Across a machine with 20 such cylinders, the annual energy saving at 6,000 operating hours per year can exceed 50,000 kWh . Frequently Asked Questions About Types of Cylinders and Electric Actuation 01 What are the main types of cylinders used in industrial automation? The main types of cylinders in industrial automation are pneumatic cylinders (air-powered, fast, clean, low force), hydraulic cylinders (oil-powered, highest force density, slower response), and electric cylinders in several variants. Electric types include the Electric Linear Cylinder (ball or lead screw driven), the electric servo cylinder (with closed-loop servo control for maximum precision), the heavy duty electric cylinder (roller screw for high-force applications), the electric over hydraulic cylinder (self-contained electrohydraulic), and the electric pneumatic cylinder (electro-pneumatic with proportional control, or a drop-in electric replacement for pneumatic cylinders). Each type occupies a different region of the force, speed, precision, and cost space, and the correct selection requires evaluating all of these parameters against the specific application requirements. 02 What is the difference between a linear cylinder and an Electric Linear Cylinder? A linear cylinder is a generic term for any actuator that produces linear motion, including pneumatic, hydraulic, and electric types. An Electric Linear Cylinder specifically refers to an electrically powered linear actuator that converts rotary motor motion into linear rod movement through a mechanical screw transmission (ball screw, lead screw, or roller screw). All Electric Linear Cylinders are linear cylinders, but not all linear cylinders are electric. The term linear cylinder is often used interchangeably with linear actuator in engineering documentation, and both terms encompass the full range of energy sources and mechanical designs. 03 When should I choose an electric over hydraulic cylinder instead of a conventional hydraulic cylinder? Choose an electric over hydraulic cylinder instead of a conventional hydraulic cylinder when: the installation location makes running hydraulic pipework impractical or very expensive (remote, elevated, or offshore locations); when a central hydraulic power unit would be oversized and inefficient for a small number of actuators; when eliminating hydraulic oil from the environment is required (food processing, pharmaceutical, marine environmental zones); when individual actuator-level energy monitoring and control is desired; or when retrofitting a machine with additional actuators where the existing HPU has insufficient spare capacity. The electric over hydraulic cylinder costs more per unit than a separate hydraulic cylinder, but the elimination of HPU, pipework, and fluid maintenance typically results in a lower total installed cost and significantly lower lifetime operating cost. 04 What makes a heavy duty electric cylinder different from a standard electric actuator? A heavy duty electric cylinder differs from a standard electric actuator in its force capacity (typically 50 kN to 300 kN versus 1 to 50 kN for standard units), its use of planetary roller screws rather than ball or lead screws (for higher load capacity at longer service life), its more robust housing construction with stronger flanges and more massive anti-rotation systems, its thermal management for high duty cycle operation under sustained load, its higher IP protection rating (IP65 to IP67), and its integration of fail-safe electromagnetic brakes rated for the full load-holding requirement. Heavy duty cylinders also use three-phase AC servo motors rather than single-phase or DC motors, providing the higher sustained power needed for continuous high-force operation. 05 What position accuracy does an electric servo cylinder achieve and how is it measured? An electric servo cylinder typically achieves position repeatability of ±0.005 to ±0.05 mm (5 to 50 micrometres) under consistent load and temperature conditions. Position accuracy (the deviation from the commanded position on the first approach from any direction) is typically ±0.01 to ±0.1 mm . These values are measured using a laser interferometer or high-resolution linear encoder as the reference standard, with the servo cylinder commanded to a grid of positions across its full stroke and the actual position recorded at each point. Backlash (the free play between the screw and nut) in a ball screw cylinder is typically 0.002 to 0.05 mm and is eliminated for positioning purposes by always approaching target positions from the same direction, or by using preloaded (zero-backlash) screw assemblies. 06 Can an electric pneumatic cylinder fully replace a pneumatic cylinder in an existing machine? Yes, an electric pneumatic cylinder designed as a drop-in replacement can fully replace a pneumatic cylinder in most applications, provided the replacement actuator matches the force requirement, stroke length, speed requirement, and mounting interface of the original pneumatic cylinder. The replacement electric cylinder uses the same ISO mounting pattern and rod dimensions as the pneumatic cylinder it replaces, requiring no modification to the machine structure. The control signal from the machine's PLC output (previously 24V to energise the solenoid valve) directly drives the replacement electric cylinder's integrated controller without any change to the machine control software. The main limitation is speed: pneumatic cylinders can achieve extension speeds of up to 3 m/s in high-flow circuits, while most electric pneumatic cylinder replacement products are limited to 0.2 to 0.8 m/s . Applications requiring very high speed should remain pneumatic or use purpose-designed high-speed electric linear actuators. 07 What is force control mode in an electric servo cylinder and when is it used? Force control mode in an electric servo cylinder is an operating mode where the servo drive regulates the thrust force at the cylinder rod to a commanded value, rather than regulating position. The servo drive monitors the motor current (proportional to motor torque, which when divided by the screw lead gives the thrust force) and adjusts the motor voltage to maintain the commanded current level. Force control mode is used in pressing operations (joining, crimping, staking), clamping operations (holding a workpiece during machining), torque testing (applying a calibrated force to measure compliance or breakaway force), material testing (applying controlled load to a specimen), and adaptive damping applications (where the cylinder absorbs and dissipates energy from a structure subject to variable external loads). Force control accuracy of 1 to 3% of rated force is typical for commercial servo cylinder systems. 08 How do I calculate the motor power required for an Electric Linear Cylinder? The motor power required for an Electric Linear Cylinder is calculated from three parameters: the required thrust force (F in newtons), the required rod velocity (v in metres per second), and the combined efficiency of the screw transmission and gearbox if fitted (η as a decimal fraction). The required mechanical output power is F multiplied by v (watts). The required motor input power is (F multiplied by v) divided by η. Example: a cylinder requiring 20 kN thrust at 0.05 m/s through a ball screw with 92% efficiency requires: mechanical output power = 20,000 N x 0.05 m/s = 1,000 W; motor input power = 1,000 W divided by 0.92 = 1,087 watts , so a 1.1 kW or 1.5 kW motor would be selected. Always add a service factor of 1.25 to 1.5 to the calculated power for peak load allowance and motor thermal derating in continuous duty. 09 What is the service life of a heavy duty electric cylinder compared to a hydraulic cylinder? A well-maintained hydraulic cylinder in a clean, properly filtered hydraulic system has a service life limited primarily by seal wear (typically 5,000 to 50,000 operating hours depending on seal materials, pressure, and contamination). A heavy duty electric cylinder with a roller screw drive has a calculated screw and nut life based on the rated dynamic load capacity and the duty profile, typically exceeding 10,000 to 50,000 operating hours at rated load, with bearing life of similar magnitude when properly lubricated. The key advantage of the electric cylinder is that its wear is predictable and progressive (the servo drive can detect increasing friction from screw or bearing wear through motor current monitoring), whereas hydraulic seal failure can be sudden and catastrophic. In hydraulically contaminated environments, the hydraulic cylinder's actual service life is often dramatically shorter than its theoretical design life due to contaminated seal surfaces accelerating wear, while the electric cylinder is completely unaffected by hydraulic system contamination events. 10 What safety features do electric cylinders have that hydraulic cylinders lack? Electric cylinders offer several safety advantages over hydraulic cylinders that are increasingly valued in modern machine design. Electronic force limiting: the servo drive can be configured to limit maximum thrust force to a set value and stop immediately if this limit is exceeded, preventing crushing injuries in collaborative robot cells and human-machine interface areas where hydraulic cylinders would require additional physical guarding. Controlled deceleration: on power loss, an electric cylinder with a regenerative drive can decelerate in a controlled manner and stop with the brake rather than falling freely, which a hydraulic cylinder does when its control valve loses power without a counterbalance valve. Position monitoring: the encoder in an electric servo cylinder continuously confirms that the rod is in the expected position; a deviation triggers an immediate alarm and stop, whereas a hydraulic cylinder cannot self-diagnose a failed internal seal allowing slow rod drift. Zero fire risk: electric cylinders contain no flammable hydraulic oil, which is a significant safety advantage in environments near ignition sources, hot surfaces, or in underground mining applications. /* ================================================================ CYLINDER TYPES ARTICLE Parent: .cyl-page Colors: #024d90 (deep blue), #1a3a52 (dark steel) Layout: DISTINCT from BLDC and semi-trailer articles Uses masthead stripe, horizontal type blocks, zigzag card flow, app strip, mechanism grid, and numbered FAQ card layout ================================================================ */.cyl-page { font-family: 'Segoe UI', Arial, sans-serif; color: #333; background: #f5f8fc; font-size: 16px; line-height: 30px;}/* ---- KEYWORD STYLE ---- */.cyl-kw { color: #024d90; font-weight: 700;}/* ---- MASTHEAD ---- */.cyl-masthead { background: #1a3a52; padding: 56px 48px 48px; position: relative; overflow: hidden;}.cyl-masthead-bg { position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: repeating-linear-gradient( to bottom, #024d90 0px, #024d90 20px, transparent 20px, transparent 30px );}.cyl-masthead-inner { position: relative; z-index: 2; padding-left: 24px;}.cyl-masthead-label { font-size: 14px; line-height: 2; font-weight: 700; color: #024d90; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 10px;}.cyl-masthead-deck { font-size: 16px; line-height: 30px; color: rgba(255,255,255,0.7); margin: 0;}/* ---- SUMMARY PANEL ---- */.cyl-summary-panel { background: #fff; display: flex; align-items: stretch; border-bottom: 3px solid #024d90;}.cyl-summary-left { background: #024d90; width: 120px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; padding: 24px 12px;}.cyl-summary-caption { color: rgba(255,255,255,0.85); font-size: 14px; line-height: 2; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; writing-mode: vertical-rl; text-orientation: mixed; transform: rotate(180deg);}.cyl-summary-right { padding: 32px 40px; flex: 1;}.cyl-summary-right strong { color: #024d90; font-weight: 700;}/* ---- SECTIONS ---- */.cyl-section { padding: 40px 48px; margin-bottom: 40px; background: #fff;}.cyl-section strong { color: #024d90; font-weight: 700;}/* ---- HEADINGS ---- */.cyl-h2 { font-size: 22px; font-weight: 700; color: #1a3a52; margin-bottom: 15px; text-align: left; line-height: 1.4; padding-bottom: 14px; border-bottom: 1px solid #d0dde8; display: flex; align-items: center; gap: 12px;}.cyl-h2::before { content: ''; display: inline-block; width: 22px; height: 4px; background: #024d90; flex-shrink: 0; border-radius: 2px;}.cyl-h3 { font-size: 14px; font-weight: 700; color: #1a3a52; margin-bottom: 15px; text-align: left; line-height: 2; background: #eef4fa; padding: 6px 16px; border-left: 3px solid #024d90; border-radius: 0 3px 3px 0; display: block;}/* ---- TYPE BLOCKS ---- */.cyl-type-row { display: flex; gap: 0; margin: 24px 0; flex-wrap: wrap; border-radius: 6px; overflow: hidden;}.cyl-type-block { flex: 1; min-width: 240px; padding: 26px 22px;}.cyl-type-pneu { background: #2d5f3f; }.cyl-type-hyd { background: #5a2d00; }.cyl-type-elec { background: #024d90; }.cyl-type-tag { font-size: 14px; line-height: 2; font-weight: 700; color: rgba(255,255,255,0.6); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 4px;}.cyl-type-name { font-size: 18px; font-weight: 800; color: #fff; line-height: 1.8; margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.15);}/* ---- MECH GRID ---- */.cyl-mech-grid { display: flex; gap: 20px; margin: 24px 0; flex-wrap: wrap;}.cyl-mech-card { flex: 1; min-width: 240px; border: 1px solid #d0dde8; border-radius: 4px; padding: 22px 20px; background: #fafcff; position: relative;}.cyl-mech-accent { position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, #024d90, #1a3a52); border-radius: 4px 4px 0 0;}.cyl-mech-title { font-size: 16px; font-weight: 700; color: #1a3a52; line-height: 30px; margin-bottom: 10px; margin-top: 4px;}/* ---- EOH LAYOUT ---- */.cyl-eoh-layout { display: flex; gap: 32px; margin: 24px 0; align-items: center; flex-wrap: wrap;}.cyl-eoh-schematic { background: #1a3a52; border-radius: 6px; padding: 28px 32px; display: flex; flex-direction: column; align-items: center; gap: 8px; min-width: 220px; flex: 0 0 auto;}.cyl-eoh-box { font-size: 14px; line-height: 2; font-weight: 700; color: #fff; padding: 8px 20px; border-radius: 4px; text-align: center; min-width: 180px;}.cyl-eoh-motor { background: #024d90; }.cyl-eoh-pump { background: #035bab; }.cyl-eoh-cyl { background: #046cc2; }.cyl-eoh-arrow { font-size: 14px; line-height: 2; color: rgba(255,255,255,0.5); font-style: italic;}.cyl-eoh-sub { font-size: 14px; line-height: 2; color: rgba(255,255,255,0.45); margin-top: 6px; text-align: center; font-style: italic;}.cyl-eoh-specs { flex: 1; min-width: 240px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px;}.cyl-eoh-spec-item { background: #eef4fa; border: 1px solid #c8dded; border-radius: 4px; padding: 12px 14px; display: flex; flex-direction: column; gap: 2px;}.cyl-eoh-spec-label { font-size: 14px; line-height: 2; color: #777; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em;}.cyl-eoh-spec-val { font-size: 14px; line-height: 2; color: #1a3a52; font-weight: 700;}/* ---- APP STRIP ---- */.cyl-app-strip { display: flex; gap: 0; margin: 24px 0; border: 1px solid #d0dde8; border-radius: 6px; overflow: hidden; flex-wrap: wrap;}.cyl-app-item { flex: 1; min-width: 220px; padding: 22px 20px; border-right: 1px solid #d0dde8; background: #fff;}.cyl-app-item:nth-child(even) { background: #f5f8fc;}.cyl-app-item:last-child { border-right: none;}.cyl-app-num { font-size: 28px; font-weight: 800; color: rgba(2,77,144,0.12); line-height: 1; margin-bottom: 6px;}.cyl-app-title { font-size: 16px; font-weight: 700; color: #1a3a52; line-height: 30px; margin-bottom: 10px;}/* ---- TABLE ---- */.cyl-section table tbody tr:nth-child(even) td { background: #eef4fa;}/* ---- FAQ CARDS ---- */.cyl-faq-wrap { display: flex; flex-direction: column; gap: 16px;}.cyl-faq-card { background: #fafcff; border: 1px solid #d0dde8; border-radius: 6px; padding: 22px 24px;}.cyl-faq-q-wrap { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 12px;}.cyl-faq-idx { flex-shrink: 0; width: 36px; height: 36px; background: #024d90; color: #fff; font-size: 14px; line-height: 36px; text-align: center; border-radius: 50%; font-weight: 700;}.cyl-faq-q-text { font-size: 16px; line-height: 30px; font-weight: 700; color: #1a3a52;}.cyl-faq-card p strong { color: #024d90; font-weight: 700;}/* ---- RESPONSIVE ---- */@media (max-width: 720px) { .cyl-masthead, .cyl-summary-right, .cyl-section { padding-left: 20px; padding-right: 20px; } .cyl-summary-left { display: none; } .cyl-type-row, .cyl-mech-grid, .cyl-app-strip { flex-direction: column; } .cyl-type-block { min-width: 100%; } .cyl-eoh-layout { flex-direction: column; } .cyl-eoh-specs { grid-template-columns: 1fr; width: 100%; } .cyl-faq-card p[style*="padding-left"] { padding-left: 0 !important; } .cyl-app-item { border-right: none; border-bottom: 1px solid #d0dde8; } .cyl-app-item:last-child { border-bottom: none; }}
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