Buying Robots for Pharma: Key Considerations

When buying robots for pharmaceutical operations, you must evaluate payload, reach, speed, precision, and cleanroom compatibility against your specific process—whether that is pill picking, vial filling, or lab automation. This article outlines the critical technical, regulatory, and economic factors to consider before making a purchase.

Formula

This calculator estimates the total number of cycles a robot can perform over its lifetime. The formula is:

Total cycles = (3600 / t) × h × d × l

Where:

• t = cycle time in seconds (time for one complete operation)
• h = operating hours per day
• d = operating days per year
• l = expected lifetime of the robot in years

The output is the total number of cycles the robot can perform, which helps estimate throughput and maintenance intervals.

Worked Example

Using the default values from the calculator:

• Cycle time (t) = 10 seconds
• Operating hours/day (h) = 16
• Operating days/year (d) = 250
• Robot lifetime (l) = 8 years

First, calculate cycles per day: 3600 / 10 = 360 cycles per hour, then × 16 hours = 5,760 cycles per day.

Per year: 5,760 × 250 = 1,440,000 cycles per year.

Over lifetime: 1,440,000 × 8 = 11,520,000 total cycles.

The calculator shows 11,520,000 total cycles, matching this calculation.

Understanding Robot Types for Pharma

Pharmaceutical facilities use several robot types, each suited to different tasks:

• Articulated robots (6-axis) – flexible, good for picking, packing, and machine tending.
• SCARA robots – fast and precise in horizontal planes, ideal for pick-and-place and assembly.
• Delta robots – very high speed, used for lightweight sorting and packaging.
• Collaborative robots (cobots) – designed to work alongside humans, often used in labs for pipetting or sample handling.
• Mobile robots (AGVs/AMRs) – transport materials between workstations.

Your choice depends on the application: vial filling requires high precision and cleanroom compatibility, while packaging may prioritize speed and payload.

Cleanroom and Regulatory Compliance

Pharmaceutical environments often require robots to operate in cleanrooms classified by ISO 14644 (e.g., ISO Class 5, 7, 8). Key factors include:

• Material finish – stainless steel (316L) or anodized aluminum to resist corrosion and be easy to clean.
• Sealing – IP ratings like IP65 or IP67 to prevent particle ingress and allow washdown.
• Lubricants – must be food-grade or pharmaceutical-grade and compatible with cleanroom use.
• Validation – the robot must support IQ/OQ/PQ (Installation, Operational, Performance Qualification) documentation from the manufacturer.

Some robots are certified for cleanroom use, but you must verify the specific class and whether the certification covers the entire robot or only certain components.

Precision and Repeatability

For tasks like filling vials or dispensing liquids, precision is critical. Key metrics:

• Repeatability – how consistently the robot returns to the same position (e.g., ±0.02 mm).
• Accuracy – how close the robot moves to the commanded position (often less important than repeatability in repetitive tasks).
• Resolution – the smallest increment of movement the robot can make.

For high-precision tasks, look for robots with repeatability of ±0.05 mm or better. Also consider the end effector (gripper, pipette) because it affects overall precision.

Integration with Existing Systems

A robot does not work alone. It must integrate with:

• Conveyors – timing and synchronization.
• Vision systems – for part location and inspection.
• PLC or SCADA – for control and data logging.
• Lab information management systems (LIMS) – in research settings.

Check the robot’s communication protocols (Ethernet/IP, Profinet, Modbus) and whether the manufacturer provides software development kits (SDKs) or APIs. Poor integration can negate the efficiency gains.

Total Cost of Ownership

Purchase price is only a fraction of the total cost. Consider:

• Installation and commissioning – including any facility modifications.
• Peripherals – end effectors, vision systems, safety guarding.
• Programming and training – for your staff.
• Maintenance – scheduled service, spare parts, and downtime costs.
• Validation and re-qualification – after any change, which is mandatory in regulated environments.

Calculate the payback period based on labor savings, increased throughput, and reduced errors. Also factor in the robot’s lifetime (as in the calculator above) to estimate cost per cycle.

Safety and Risk Assessment

Robots in pharmaceutical settings must comply with safety standards like ISO 10218 (for industrial robots) and ISO/TS 15066 (for collaborative robots). Key considerations:

• Risk assessment – must be performed before installation, covering pinch points, ejection, and electrical hazards.
• Safety features – light curtains, safety-rated monitored stops, and force limiting for cobots.
• Emergency stops – must be easily accessible.
• Validation of safety functions – documented and tested.

In pharmaceutical environments, also consider chemical exposure (if cleaning agents are used) and the risk of contamination from the robot itself.

Common Mistakes and Misconceptions

A frequent mistake is underestimating the need for validation. A robot that works in a lab may not meet GMP (Good Manufacturing Practice) requirements for production. Another misconception is that collaborative robots are always safer than industrial robots – in fact, cobots can still cause injury if not properly risk-assessed.

Also, buyers often overlook the importance of spare parts availability. Pharmaceutical production cannot afford long downtime, so choose a supplier with local support and a good spare parts policy.

Frequently Asked Questions

What is the typical payback period for a pharma robot?

Payback depends on labor costs, throughput, and the specific application. In high-volume packaging, payback can be under two years; in low-volume lab automation, it may take longer. Use total cost of ownership (including validation) to estimate.

Can any robot be used in a cleanroom?

No. Cleanroom compatibility must be explicitly specified by the manufacturer, with a certified ISO class. Even then, you must verify that the robot’s materials and lubricants are suitable for your cleaning agents and processes.

How do I validate a robot for GMP compliance?

Validation follows the standard IQ/OQ/PQ process. The robot manufacturer should provide documentation for installation and operational qualification. You must also run performance qualification with your actual product and process.

What is the difference between repeatability and accuracy?

Repeatability is the ability to return to the same position consistently; accuracy is how close that position is to the commanded point. For most repetitive pharmaceutical tasks, repeatability matters more because the robot is taught positions once.

Are collaborative robots suitable for pharmaceutical production?

Yes, for tasks like sample handling or small-part assembly, but they are not automatically safe. They must still undergo risk assessment, and their speed and force limits must be set appropriately for the application.

How often should a pharmaceutical robot be serviced?

Follow the manufacturer’s recommended schedule, typically every 1,000 to 2,000 operating hours or annually. In cleanrooms, more frequent checks of seals and lubrication may be needed to prevent contamination.

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in t | Cycle time (s) | s | 10 | 0 | 3600
in h | Operating hours/day | h | 16 | 0 | 24
in d | Operating days/year | days | 250 | 0 | 365
in l | Robot lifetime (years) | years | 8 | 0 | 30
out cyc | Cycles per year | cycles | (3600 / t) * h * d | 0
out total | Total cycles over lifetime | cycles | cyc * l | 0