Evaluating a Pre-Owned ZEISS PRISMO-MP5 CMM (Bridge-type) Before Purchase

“From Factory Floor to Your Metrology Room”

Machine Overview

The ZEISS PRISMO family of bridge-type coordinate measuring machines (CMMs) are German-built high-precision metrology systems, typically used in quality and inspection labs for dimensional measurement of work-pieces with tactile and/or scanning probes.
Specifically, a used PRISMO MP5 (or MP5/HTG variant) you mentioned may have measuring travel roughly X ≈ 700 mm, Y ≈ 900 mm, Z ≈ 500 mm (based on used-listing of an MP5 HTG)

Key specs for the PRISMO family:

• Length-measurement error (for standard PRISMO model) from 0.9 + L/350 µm at 19-22 °C.
• Travel sizes range from ~700×900×500 mm up to ~1600×4200×1400 mm depending on size class.
• Multi-sensor capability (“ZEISS mass” technology) allows tactile, scanning and optical probes on the same platform.

When you’re evaluating a used PRISMO MP5 (or any second-hand CMM), you’re dealing not just with an old machine, but a precision instrument whose accuracy, environment, and maintenance history matter critically.

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Pre-Purchase Inspection Checklist

Here is a structured checklist to evaluate the machine thoroughly before purchase:

A. Machine Fundamentals & Environment

• Verify the model, size class and travel (X, Y, Z) of the machine matches your inspection needs. Example: MP5 ~700×900×500 mm.
• Confirm the year of manufacture, usage hours (or cycles) and any retrofits or upgrades (controller changes, sensor system updates).
• Inspect the installation environment: Was the machine installed in a metrology room with proper temperature control (19-22 °C) and good foundation (vibration isolation)? Accuracy specs of PRISMO assume stable ambient conditions.
• Check whether the foundation/leveling is still intact, and that the machine has been recalibrated to standard.
• Examine the surface condition of the granite table (if applicable), the bridge structure, and bearings for signs of damage, wear, corrosion or contamination.

B. Mechanical & Kinematic Condition

• Move the bridge and axes slowly, check for smooth motion, no sticking, unusual noises, or vibration.
• Check for play/backlash in axes, measure using a dial indicator or test sphere if possible.
• Inspect the guideways, linear scales, air bearings (if used) for wear or damage. OEM spec mentions glass-ceramic scales, etc.
• Review the condition and calibration status of the probe changer magazine, probe heads, stylus system. For example used listing: “RST 5x probe system, 5-way probe changer magazine” for MP5 HTG.

C. Control, Software & Sensor System

• Confirm which controller is installed (C98, C99, C99m etc). Ensure software (e.g., ZEISS CALYPSO) is licensed and valid.
• Check the sensor head system (tactile or scanning probes) and any upgrades. Older machines might benefit from retrofits for improved accuracy or scanning capability.
• Ask for historical calibration/maintenance records: date of last full calibration, service logs (bearing replacements, sensor rebuilds).
• Check that all auxiliary systems (air supply for probes, dust/temperature compensation, safety interlocks) are functional.

D. Accuracy & Performance Testing

• Ask for a recent calibration certificate or perform an on-site verification test: e.g., measuring a certified artefact (calibration sphere, gauge block) and comparing results.
• Run a repeatability test: measure the same feature several times and look at the scatter. Repeatability for PRISMO is specified in microns (µm).
• Run a scanning test (if scanning probe is installed): check for smooth data collection, stable performance, valid form error measurement. Scanning specs are given in the literature.
• Check for thermal stability: let the unit run for a period and see if readings drift due to ambient changes.

E. Usage History & Hidden Costs

• Ask about usage regime: Was the machine used for light duty inspection or heavy harsh shop environment? Heavy contamination or misuse may degrade performance.
• Check for downtime history, major repairs (e.g., sensor head rebuilds, controller upgrades) and parts availability.
• Evaluate retrofit options: Old machines may require updates (controller, probes, software) which can add cost. Example: MP5 listing notes “Complete retrofit of the C99 and the current CALYPSO version possible”.
• Consider floor space, foundation and relocation cost—CMMs often require precise leveling, environmental control, and relocation is non-trivial.

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Typical Value & Market Comparison

For a used ZEISS PRISMO MP5 (circa late 1990s or early 2000s) the price will vary widely depending on condition, travel size, probe/system configuration and calibration status. Used listing example: ~€19,500 for MP5 HTG 700×900×500 in very good condition.

Create your budgeting like:

• Excellent condition, recently calibrated, full sensor/probe package: higher end of used market
• Good condition, older controller/sensors, needs retrofit: moderate discount
• Poor condition (controller obsolete, sensors worn, calibration overdue): bargain but higher risk of hidden cost

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Summary Checklist Table

Here’s a quick table you can print/use on-site:

Item	Key Questions	Acceptable Condition
Model & Travel	Is model MP5, size matches your inspection need?	Matches expected travel ±10%
Year & Usage	Year of manufacture, hours/cycles, workload type?	Relatively recent, documented service
Environment	Was it in metrology room; foundation stable?	19-22 °C stable, vibration isolation present
Mechanical Condition	Smooth axis motion, no play/backlash, clean guideways?	No major wear/repair required
Probe/Changer System	Probe magazine exists, calibrations recent, stylus inventory?	Fully functional, recent calibration certificate
Controller & Software	Which controller version, software license status?	Up-to-date or retrofit possible
Accuracy Verification	Can you test repeatability & accuracy?	Within spec for travel size
Maintenance History	Logs available, major repairs?	Complete records, minimal major repairs
Relocation & Setup Cost	Will installation/foundation/air-supply cost extra?	Budget accounted for relocation/setup
Hidden Costs	Obsolete parts, retrofit requirements?	Anticipated and negotiated into price

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Final Thoughts

Purchasing a used ZEISS PRISMO MP5 is a solid option if you require high‐precision metrology and the machine has been well maintained. However, you are effectively buying a precision instrument—not just “used machinery”—so thorough inspection and verification are vital. Neglecting calibration, environment or wear can lead to large hidden costs and degraded measurement reliability.