HFB Series – High Frequency Batch Finishers

Optimized Floor Space | Labor Efficiencies | Improved Quality

Kramer’s HFB Series High Frequency Batch Finishers are engineered for precision surface refinement, low Ra finishing, and mirror-like polishing of complex, high-value components. As advanced vibratory finishing machines within Kramer’s engineered vibratory systems portfolio, HFB machines are designed for applications where traditional finishing machines and conventional vibratory systems reach their limits. These HFB machines utilize a high-frequency, low-amplitude lapping action to deliver consistent, repeatable, and isotropic surface finishes.

Unlike conventional vibratory systems that rely primarily on amplitude and part-to-part interaction, HFB machines fixture parts securely within the work chamber. This eliminates impingement while ensuring complete and uniform media contact. The result is superior surface refinement without directional patterns, shadowing, or leading-edge effects, setting this vibratory finishing machine apart from standard finishing machines.

The HFB Series is especially well-suited for polishing automotive and performance wheel rims, where achieving a uniform, mirror-like finish across complex contours is critical. The isotropic media motion ensures full surface coverage, including spokes and intricate design features, while preventing edge rounding or distortion. Compared to traditional vibratory systems, HFB machines provide improved control and repeatability for these demanding applications.

These finishing machines are also ideal for aerospace blisks (bladed disks), where precision finishing of airfoil surfaces and internal geometries is required. The high-frequency lapping action produces smooth, consistent finishes without directional bias, improving aerodynamic performance and reducing manual polishing time. Because parts are fixtured during processing, delicate blade profiles are protected while still achieving complete surface refinement.

Additional applications include:

• Bearing races
• Wind turbine shafts and pinions
• Forging mold refurbishment
• Medical devices
• Any high-value or delicate component requiring precise finishing

How the HFB Process Works

The HFB Series generates motion using high frequency and controlled low amplitude to create a true lapping-style action. Two indexable vibratory motors are mounted on adjustable indexing plates, allowing operators to change the orientation of amplitude and fine-tune media flow within this precision vibratory finishing machine.

The media motion inside the chamber is isotropic, eliminating directional finishing problems and enabling access to internal surfaces that conventional vibratory systems cannot effectively process. This capability reinforces Kramer’s expertise in engineered vibratory systems for complex part geometries.
Further process control is achieved through:

• Adjustable motor weights to modify aggression
• Dual variable frequency drives to fine-tune operating frequency
• Precision fixturing to protect delicate parts

This level of control allows one machine platform to cover a wide spectrum of finishing requirements, from aggressive refinement to ultra-fine polishing.

Construction and Design

HFB finishers feature a heavy-duty, interlocking structural design forming a cylindrical processing chamber.
Each unit includes:

• Premium polyurethane lining
• Integrated drain system
• Vibration isolators and rigid base frame
• High-efficiency vibratory motors
• Adjustable weight system for process tuning

The integrated vibration isolators enhance operational stability and energy transfer efficiency, further optimizing performance within demanding vibratory systems environments.

The compact footprint maximizes production capacity without consuming valuable floor space.

Key Advantages

• Greater force and energy transmission than standard vibratory systems
• Significantly shorter cycle times compared to conventional finishing machines
• Ideal for high-value parts requiring mirror finishes, including wheel rims and blisks
• Gentle, controlled process suitable for sensitive components
• Complete part coverage and repeatability
• Improved part quality with reduced manual labor

By automating processes that were traditionally performed by hand, the HFB Series improves consistency while reducing labor costs, variability, and rework. As a high-performance vibratory finishing machine, it delivers measurable gains in both productivity and surface quality.

HFB Series Specifications

Why Choose the HFB Series?

If you are finishing high-value parts where surface quality, repeatability, and process control are critical, the HFB Series delivers measurable advantages over conventional vibratory systems or other finishing machines.
For wheel manufacturers seeking a consistent mirror polish across complex rim designs, or aerospace manufacturers refining critical blisk surfaces, HFB machines provide the precision, energy, and control required within advanced vibratory systems.
Shorter cycle times. Higher polish levels. Better surface consistency. Smaller footprint.
For manufacturers focused on precision and efficiency, the HFB Series delivers a controlled, high-energy vibratory finishing machine solution built to elevate finishing performance.