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 Annual Maintenance: 8 Items Most Shops Miss

admin

Most servo press maintenance programs cover the obvious items. Here are the ones that get skipped.

Mechanical (Often Missed):
- Eccentric shaft bearing preload: Check annually with a dial indicator. Preload loss causes slide position drift that looks like a control problem.
- Connecting rod bearing clearance: Measure with Plastigage. Clearance above 0.08mm on a 200-ton press indicates bearing replacement needed.
- Counterbalance cylinder rod seal: Pressure test at 110% of operating pressure.
- Brake/clutch wear indicator: Check it. Do not wait for stopping time to increase.

Electrical (Often Missed):
- Drive cooling fan: Check airflow with a piece of tissue paper. Fans degrade gradually.
- DC bus capacitor ESR: Measure with an LCR meter. High ESR causes DC bus ripple that triggers false alarms.
- Encoder cable insulation resistance: Test with a 500V megger. Values below 1 megaohm indicate insulation breakdown.
- Safety relay contact resistance: Contacts above 0.5 ohm should be replaced.

raj_maintenance

Practical field method for DC bus capacitor check without an LCR meter: monitor DC bus voltage ripple during a heavy forming stroke using the drive diagnostic screen. Healthy capacitors show less than 5% ripple. If ripple exceeds 10%, the capacitors are degrading and should be replaced at the next scheduled downtime. This takes 5 minutes and catches capacitor aging before it causes drive faults or nuisance trips.

carlos_stamping

The eccentric shaft bearing preload check is the one I see missed most often. It requires a dial indicator setup and a specific procedure that most maintenance teams haven't been trained on. We brought in the press manufacturer for a half-day training session specifically on this check. Worth every penny —found a bearing going bad on our 400T press.