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 Slide Parallelism Check: Measurement Procedure

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## Why Parallelism Matters

Slide parallelism is the flatness of the slide surface relative to the bolster. If the slide is not parallel, one side of the die contacts the material before the other, causing uneven forming, die damage, and part defects.

## Acceptable Values

- New press: 0.01mm per 300mm
- In-service: 0.02mm per 300mm (action limit)
- Reject limit: 0.05mm per 300mm (stop production)

## Measurement Procedure

**Equipment:** Dial indicator with magnetic base, precision ground reference bar (1000mm long).

1. Clean bolster surface thoroughly.
2. Place reference bar on bolster in left-right direction.
3. Mount dial indicator on slide, contact tip on reference bar.
4. Jog slide to BDC.
5. Zero dial indicator at left end of bar.
6. Move indicator to right end of bar. Record reading.
7. Repeat in front-back direction.
8. Record all four corner readings.

## Interpreting Results

If left-right parallelism is out: gib wear on one side, or gib adjustment needed.

If front-back parallelism is out: connecting rod length difference, or crankshaft bearing wear.

## Correction

Left-right: adjust gibs on the high side.

Front-back: check connecting rod adjustment (if adjustable) or crankshaft bearing clearance. This is a major repair — contact press manufacturer.

mike_chen_eng

For parallelism measurement I recommend four-point measurement (one at each corner of the slide face) rather than two-point. This catches twist as well as tilt.

Typical tolerance for a 200-ton machine: 0.02mm across the full slide face. Above 0.05mm you will see uneven gib liner wear and asymmetric part springback.

Important: always re-check parallelism after any gib adjustment. The gibs affect slide alignment more than most people expect.

raj_maintenance

We check parallelism monthly using a granite straight edge and dial indicator. The key is measuring under load, not just static. Put a test block in the die space and measure parallelism at 50% tonnage. Static parallelism can be perfect while loaded parallelism is off by 0.05mm due to frame deflection.