Servo Press Applications: Where and Why They're Preferred

When people think of presses, hydraulic or pneumatic systems usually come to mind first. But in applications where precision, repeatability, and quality traceability are critical, servo presses have surpassed both of these technologies in recent years. This article covers what a servo press is, which applications it excels in, and what to consider for correct sizing.

What is a servo press?

A servo press is an electromechanical pressing system driven by a ball/planetary screw and a servo motor, replacing the hydraulic cylinder. The difference isn't just in the power source — it's in the control philosophy: while a hydraulic press operates on a pressure-focused basis, a servo press controls both force and position simultaneously, in closed loop. This means that at every moment of the pressing operation, both "how much force is being applied" and "where the shaft currently is" are known simultaneously and logged.

A servo press is, in fact, an electric cylinder

Thinking of the servo press as a separate technology is a common misconception — at its core is the same electric cylinder mechanics (servo motor + ball/planetary screw + guide system) that iMotion also manufactures. What distinguishes a servo press from a standard electric cylinder is the addition of two application-specific elements: a rigid frame/press body to withstand the pressing force, and a force feedback layer that measures/records force in real time (a load cell or an estimate via motor current).

In practice, this means two things:

• The same selection and sizing logic (force, lead, torque, lifetime) that applies to electric cylinders applies directly to servo presses as well — the motor/torque calculation tool on this site can be used directly for servo press applications too.
• For high-force, long-life pressing applications, heavy-duty electric cylinders like the IMT series can be used directly as the servo press's drive unit; the press design is built on top of this cylinder.

In other words, a servo press request is essentially a "cylinder + force control" request — when you consult our engineering team, we first determine which electric cylinder platform (force, stroke, lead) fits your application, then build the press frame and force feedback integration on top of it.

Why is it preferred?

Force-displacement curve traceability — This is the biggest difference of the servo press. A complete force-displacement curve is recorded on every cycle. This curve doesn't just answer "was the part pressed," but also "was it pressed correctly" — a deviating curve instantly catches an assembly error invisible to the eye (wrong part, missing component, excessive/insufficient force). This is what makes 100% quality control possible on automotive and white goods lines.

Repeatability — In hydraulic systems, factors like pressure fluctuations and viscosity changes due to oil temperature create small cycle-to-cycle differences. Thanks to closed-loop control, a servo press keeps cycle-to-cycle deviation constant at the micron and Newton level.

Energy efficiency — A hydraulic pump generally keeps running even while the press is idle. A servo motor consumes practically no energy outside of motion — consumption approaches zero during dwell times.

Cleanliness and maintenance — The risk of hydraulic oil leaks and maintenance items like filter/oil changes are eliminated. In contamination-sensitive environments such as cleanrooms or food/electronics manufacturing, this alone can be a decisive advantage.

Programmable force profile — During pressing, force can be held constant, increased in stages, or temporarily held (dwell) at a specific position before continuing — this is a software parameter, not a single mechanical adjustment.

Typical application areas

Bearing / bushing press-fit — A classic servo press application requiring simultaneous precise control of position and force, where errors become costly further down the production line.

Riveting and staking — The force-displacement curve verifies that the rivet head formed correctly; faulty rivets are detected instantly on the line.

Electrical/electronic assembly — In operations like connector insertion or pressing components onto a PCB — low force but high precision — it offers a resolution that hydraulic/pneumatic systems cannot provide.

Quality control stations — On some lines, the servo press is used not for production directly, but as a test station measuring the behavior of a produced part (e.g., a gasket or joint) under force.

Multi-station synchronized pressing on assembly lines — Lines where multiple servo axes operate synchronously, each station transmitting its own force-displacement data to a central system.

What to consider when sizing

Three parameters must be evaluated together when selecting a servo press:

1. Peak force — The highest force at the moment of pressing differs from continuous operating force; motor and screw selection should be based on peak force, while heating should be checked against continuous force.
2. Cycle time and dwell — If there is a hold (dwell) period after pressing, maintaining constant force throughout this period creates additional requirements on the motor/drive side.
3. Force precision — In quality-control use, the system's force measurement resolution (load cell or estimate from motor current) is one of the final decision criteria.

These three parameters are interlinked — peak force and speed together are inputs to the torque/power calculation in our motor calculation tool. If you share your application's force-displacement-time profile, we can jointly determine the correct motor and screw combination.

This article is a general overview; for a specific application, servo press sizing should be validated with actual force profile and cycle time data.