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

How to Specify a Servo Press: RFQ Checklist for Engineers

admin

## Why Specification Matters

A poorly specified servo press RFQ results in quotes that are not comparable, and a press that may not meet your production needs. Use this checklist to write a complete specification.

## Required Specifications

**Tonnage:** State nominal tonnage AND the position at which it is rated. Example: 200T at 6mm above BDC. Some manufacturers rate tonnage at BDC (optimistic) vs. 6mm above BDC (conservative).

**Stroke:** Maximum stroke length in mm. For deep drawing, you need stroke = draw depth x 2.5 minimum.

**Shut height:** Distance from slide bottom to bolster top at BDC. Must accommodate your die height.

**Bolster size:** Length x width in mm. Must be larger than your die footprint.

**SPM range:** Minimum and maximum SPM. State your production target SPM.

**BDC repeatability:** State required value. Typical: 0.01mm for general forming, 0.005mm for precision.

**Motion profile:** State if you need programmable speed profiles, dwell at BDC, pendulum motion.

## Drive and Control Specifications

- Control system brand preference (Siemens, Fanuc, Yaskawa, Mitsubishi)
- Safety category required (typically Category 4 / PLe for press applications)
- Network protocol (PROFINET, EtherNet/IP, EtherCAT)
- Data logging requirements (strokes per shift, tonnage history, fault log)

## Delivery and Support

- Required delivery date
- Installation and commissioning support required
- Spare parts package
- Training requirements
- Warranty terms

carlos_stamping

Add to the RFQ: require the vendor to run your actual part (or a representative test part) during the acceptance test. Paper specs are meaningless if the press can't make your part. We specify a 500-piece acceptance run with CPK > 1.33 on critical dimensions. If the press can't pass, we don't accept delivery.

jim_applications

From the vendor side: the more detail you put in the RFQ, the more accurate the quote. Vague RFQs get padded prices because we have to assume worst case. Include: material specs, part drawings, annual volume, target SPM, die weight, and shut height range. A good RFQ saves both sides time and money.