Sizing an Electric Stamping Actuator for 1500 N Duty

The corrected design target is an electric actuator delivering up to 1500 N over a 10 mm stroke. The approximate sequence is 1 s forward, 1 s at force, 1 s return, and 1 s idle. Position accuracy is secondary, but the mechanism must land softly, regulate force, and withstand repeated cycling in a retail environment.

Define the Mechanical Duty

If the actuator produces 1500 N throughout the complete 10 mm forward stroke, the mechanical work is 15 J and the average output during that one-second stroke is 15 W. This is a sizing boundary, not a confirmed operating profile: actual motor power also depends on the force-versus-position curve, transmission efficiency, acceleration, and return load.

Control Force Through Compliance and Feedback

Do not infer applied force solely from commanded motor position. Place a compliant element, such as the proposed polyurethane spring, in the load path and measure actual force with a load cell. The controller advances until measured force reaches the setpoint, holds that force for the required interval, and then retracts. This approach also provides the requested soft landing because force rises through controlled spring compression instead of an abrupt rigid stop.

Advance at controlled speed
When tool contacts workpiece:
    continue advancing while measured_force < force_setpoint
Hold measured_force at force_setpoint for hold_time
Retract 10 mm
Wait for cycle command or configured delay

For a linear compliant element, the first-order relationship is F = kx, where F is force, k is spring stiffness, and x is compression. Select stiffness and available compression so 1500 N remains within the permitted actuator travel and spring range. Calibrate commanded position against the load-cell measurement rather than relying on the nominal spring constant alone.

Compare Transmission Concepts

A low-lead screw driven by a non-captive stepper, including the considered Haydon Kerk 57000, converts motor rotation into low-speed, high-thrust linear motion. Confirm its thrust, speed, thermal duty, screw life, permissible side loading, and ability to hold force before selection; the evidence does not provide those ratings.

A geared motor and cam can encode the forward, dwell, return, and delay portions mechanically. However, changing cycle timing requires motor-speed control or a different motion profile. A roller follower can reduce sliding friction. Wedge and lever mechanisms can also trade longer, lower-force input motion for shorter, higher-force tool motion, but their force multiplication varies with geometry and position.

Select and Verify the Architecture

1. Confirm whether 1500 N is the maximum regulated tool force and measure the actual force-versus-position profile across the 10 mm stroke.
2. Select a screw, cam, wedge, or lever ratio that delivers the required stroke and force without exceeding the actuator's documented thrust, torque, speed, or duty limits.
3. Add compliance in the force path and install a load cell aligned with the applied load.
4. Program controlled approach, force-limit control, the 1 s hold, retraction, and adjustable delay. Do not depend on a hard mechanical stop to establish force.
5. Verify 10 mm/s average approach speed, 1500 N maximum force, soft contact, repeatability, motor temperature, and transmission wear over representative continuous cycling.

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