Pharmaceutical Grade Stainless Steel Hammer Mill Refurbishment & Performance Upgrade
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The Challenge: Modernising Legacy Milling Equipment for Precise API Down-Sizing
A pharmaceutical production facility required a comprehensive overhaul of two existing stainless steel hammer mills used for processing sensitive medicinal powders. The goal was to restore the units to peak operational efficiency while introducing the flexibility to handle multiple grain sizes. Because the facility’s control architecture did not support electronic frequency inverters (VFDs), a mechanical solution was required to allow for variable rotational speeds without compromising the torque needed for high-purity API (Active Pharmaceutical Ingredient) milling.
A pharmaceutical production facility required a comprehensive overhaul of two existing stainless steel hammer mills used for processing sensitive medicinal powders. The goal was to restore the units to peak operational efficiency while introducing the flexibility to handle multiple grain sizes. Because the facility’s control architecture did not support electronic frequency inverters (VFDs), a mechanical solution was required to allow for variable rotational speeds without compromising the torque needed for high-purity API (Active Pharmaceutical Ingredient) milling.
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The Solution: Mechanical Speed Control & Precision Component Engineering
We executed a “zero-hour” refurbishment, transforming the legacy mills into versatile, high-precision instruments:
We executed a “zero-hour” refurbishment, transforming the legacy mills into versatile, high-precision instruments:
- Custom Multi-Pulley Drive System: To provide variable speed control without a VFD, we engineered a bespoke three-pulley transmission system. This allows operators to manually adjust the rotational speed across three distinct tiers, matching the impact force to the specific fragility of the pharmaceutical powder.
- High-Precision Sieve Set: We manufactured six interchangeable stainless steel sieves with varying mesh apertures. This allows the plant to switch between ultra-fine and coarse granulation for different medicinal recipes in minutes.
- Complete Mechanical Overhaul: The project included the fabrication of new, balanced stainless steel hammers and knives and the installation of high-efficiency motors to ensure 24/7 reliability in a sterile environment.
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The Result: GMP-Compliant Versatility and Extended Asset Life
By modernising the mechanical drive and expanding the sifting capabilities, the plant achieved the flexibility of a modern mill while maintaining their existing electrical infrastructure. The refurbished units now deliver consistent, validated particle size distributions, extending the life of the assets and ensuring full compliance with UK pharmaceutical manufacturing standards.
By modernising the mechanical drive and expanding the sifting capabilities, the plant achieved the flexibility of a modern mill while maintaining their existing electrical infrastructure. The refurbished units now deliver consistent, validated particle size distributions, extending the life of the assets and ensuring full compliance with UK pharmaceutical manufacturing standards.
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Hammer Mill – Technical Specifications Table
| Specification | Technical Details |
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| System Type | Refurbished Pharmaceutical Hammer Mill |
| Material Construction | 316/304 Stainless Steel (Pharma Grade) |
| Speed Control | Mechanical Multi-Pulley System (3 Speed Tiers) |
| Sizing Flexibility | 6 Interchangeable Precision Mesh Sieves |
| Components Replaced | New Rotating Hammers, Knives, & High-Efficiency Motors |
| Application | Pharmaceutical Powder Down-Sizing / API Processing |
| Key Advantage | Variable speed control without electronic frequency inverters |