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 Adjustment: Step-by-Step Guide

admin

Slide adjustment is one of the most critical maintenance procedures on a servo press. Incorrect slide parallelism causes uneven die loading, accelerated tool wear, and poor part quality.

## Why Slide Parallelism Matters

The slide must be parallel to the bolster plate within tight tolerances — typically 0.02mm per 300mm for precision work. Even small deviations cause:
- Uneven blanking forces across the die
- Premature wear on one side of the tooling
- Part dimension variation
- Increased noise and vibration

## Tools Required

- Dial indicator with magnetic base (resolution 0.001mm)
- Precision ground test bar or reference block
- Feeler gauges
- Shim stock (0.01mm to 0.5mm)
- Torque wrench

## Measurement Procedure

**Step 1:** Clean the slide face and bolster plate thoroughly. Any debris will give false readings.

**Step 2:** Mount dial indicator on the bolster plate. Zero it at the front-left corner of the slide face.

**Step 3:** Move the indicator to front-right, rear-left, and rear-right corners. Record all four readings.

**Step 4:** Calculate the deviation: maximum reading minus minimum reading. This is your parallelism error.

**Step 5:** For a 4-point measurement, also check the center. Center deviation indicates slide crown or concavity.

## Acceptable Tolerances

| Press Class | Parallelism Tolerance |
|-------------|----------------------|
| General purpose | 0.05mm/300mm |
| Precision stamping | 0.02mm/300mm |
| Fine blanking | 0.008mm/300mm |

## Adjustment Procedure

Most servo presses use gib-based adjustment. The gibs are tapered wedges that control slide clearance and alignment.

**Step 1:** Loosen the gib locking screws on the high side.

**Step 2:** Tighten the adjustment screws incrementally — quarter turns only.

**Step 3:** Re-measure after each adjustment. Do not over-adjust.

**Step 4:** When within tolerance, tighten locking screws to specified torque.

**Step 5:** Run 20 dry cycles and re-measure. Thermal expansion will slightly change readings.

## Shimming for Coarse Adjustment

If gib adjustment range is insufficient, shims can be added behind the gib. Use precision ground shim stock. Calculate required shim thickness from your measurement data.

## Documentation

Record all measurements before and after adjustment. Track trends over time — increasing parallelism error between adjustments indicates accelerating gib wear.

raj_maintenance

Good procedure. I'd add: always check slide parallelism AFTER adjusting shut height, not just before. The adjustment process itself can shift parallelism slightly, especially on older presses where the adjustment mechanism has wear. Takes 5 extra minutes but saves hours of troubleshooting bad parts.

tom_pressops

As an operator, the thing I wish more setup guides mentioned: let the press warm up for 20-30 minutes before doing final shut height adjustment. Thermal expansion changes BDC position by 0.02-0.05mm on our 200T press. If you set it cold, your first 100 parts will be out of spec.