What is a servo press?

A servo press uses servo motors for precise force and position control during forming operations.

How do I calculate servo press tonnage?

Use our free tonnage calculator at servopress.club/tonnage-calculator.html

Servo Press for Medical Device Stamping: Precision Requirements

admin

## Why Medical Stamping Is Different

Medical device components (surgical instrument parts, implant components, catheter fittings) require tolerances and traceability that exceed typical industrial stamping.

## Typical Requirements

- Dimensional tolerance: +/-0.005-0.02mm on critical features
- Surface finish: Ra 0.4-0.8 μm (no burrs, no scratches)
- Material: 316L stainless steel, titanium, cobalt-chrome alloys
- Traceability: every part must be traceable to material lot and press parameters
- Validation: IQ/OQ/PQ required for FDA-regulated devices

## Press Requirements

To achieve +/-0.005mm tolerances:
- BDC repeatability: +/-0.002mm or better
- Slide parallelism: 0.003mm per 300mm
- Temperature-compensated position control (thermal expansion affects accuracy)
- Direct-drive servo press only (gear reducers introduce backlash)

## Process Control

**100% tonnage monitoring:** Every stroke must be within +/-3% of nominal. Out-of-tolerance strokes trigger automatic part rejection.

**Parameter logging:** Press must log slide position, velocity, and tonnage for every stroke. Data retained for device lifetime (typically 10+ years).

**Die qualification:** New dies require 300-stroke qualification run before production. Statistical analysis of all 300 strokes.

## Recommended Presses

For medical stamping at 10-50T:
- Aida DSF-N1 series (direct drive, +/-0.002mm BDC)
- Bruderer BSTA (high-speed, excellent for small parts)

For 50-200T medical components:
- Aida DSF-N1-200
- Schuler MSP series

lisa_quality

Medical stamping validation is a different world. We run IQ/OQ/PQ protocols on every new die setup. The servo press force monitoring data is essential for the PQ —we need to demonstrate CPK > 1.67 on all critical dimensions over a 1000-piece validation run. Without the servo's data logging, this would require 100% CMM inspection.

sarah_mfg_eng

Traceability is the big one. Every part needs to be traceable to the specific press stroke that made it. We use the servo press controller's stroke counter synced with a vision system that reads the part serial number. If a quality issue is found downstream, we can pull the exact force curve for that specific part.