Centrifugal barrel finishing (CBF) is a high-energy mass finishing process that can produce very refined surfaces on parts in a fraction of the time required by conventional barrel or vibratory finishing. CBF works by mounting barrels on a rotating turret such that as the turret spins, the barrels counter-rotate, subjecting the media and parts inside to high centrifugal forces and sliding motion that quickly remove burrs and create smooth surfaces. CBF is well-suited for precision applications and developing specialized finishes more rapidly than conventional equipment.
Mass media finishing techniques improve part performance and service life, and these processes can be tailored or modified to amplify this effect. Although the ability of these processes to drive down deburring and surface finishing costs when compared to manual procedures is well known and documented, their ability to dramatically effect part performance and service life are not. This facet of edge and surface finishing deserves closer scrutiny and this is also true of larger and more complex parts – only more so
Technical article on Centrifugal Iso-Finishing for deburring and polishing.
Contact:
Dave Davidson
Deburring/Finishing Technologist
SME Tech Community Advisor
dryfinish@gmail.com | 509.230.6821
http://dryfinish.wordpress.com
http://about.me/dave.davidson
http://partsfinished.wordpress.com
Finished part portfolio: https://www.flickr.com/photos/72325472@N04/albums/72157686262863672
________________________
Free Sample Processing
Contract Deburring and Finishing Services
High Energy Finishing Equipment and Process Development
Mass media finishing techniques improve part performance and service life, and these processes can be tailored or modified to amplify this effect. Although the ability of these processes to drive down deburring and surface finishing costs when compared to manual procedures is well known and documented, their ability to dramatically effect part performance and service life are not. This facet of edge and surface finishing deserves closer scrutiny and this is also true of larger and more complex parts – only more so
Technical article on Centrifugal Iso-Finishing for deburring and polishing.
Contact:
Dave Davidson
Deburring/Finishing Technologist
SME Tech Community Advisor
dryfinish@gmail.com | 509.230.6821
http://dryfinish.wordpress.com
http://about.me/dave.davidson
http://partsfinished.wordpress.com
Finished part portfolio: https://www.flickr.com/photos/72325472@N04/albums/72157686262863672
________________________
Free Sample Processing
Contract Deburring and Finishing Services
High Energy Finishing Equipment and Process Development
INTRODUCTION: The Turbo-Finish process (also referred to as Turbo-Abrasive Machining )imparts beneficial compressive residual stress to edges and surfaces. and as all critical features of the part are processed simultaneously, it can produce a stress equilibrium throughout the entire part. One of the signature advantages of the process is that it is capable of producing peening like metal surface improvement effects, while simultaneously developing isotropic surfaces and deburring and edge-contouring sharp edged features This combination of edge and surface effects can help extend part life on components by mitigating crack propagation.
Turbo abrasive machining tech paper - 2016Dave Davidson
INTRODUCTION: Turbo-Finish technology (also referred to as Turbo-Abrasive Machining) is a dry, high-speed spindle finishing process that utilizes abrasive fluidized bed technology, and high speed part rotation to develop extremely rapid and uniform edge and surface conditioning on aerospace, automotive and industrial parts. Polishing, deburring and edge radiusing are accomplished anywhere that the media can access. This finishing technology can develop isotropic surface finishes s while developing consistent round edges on any exposed sharp edged features.
Turbo-Finish and premature fatigue failure prevention and life extension. Turbo-Finish’s unique ability to produce isotropic surfaces on rotating parts can make them much less susceptible to problems associated with crack propagation. Additionally, the elimination of stress risers, and the generation of round edges are used to help extend component life. Rotating parts can especially benefit from the Turbo-Finish process. Disks and other rotating parts can all benefit from this surface and edge conditioning. Highly finished surfaces also tend to pick up less residual contaminants from operations. and smooth isotropic surfaces generate less turbulent air flow across their surfaces. Additionally, the Turbo-Finish process imparts beneficial compressive residual stress. As critical features of the part are processed simultaneously, it can produce a stress equilibrium throughout the entire part. One of the signature advantages of the process is that it is capable of producing peening like metal surface improvement effects, while simultaneously developing isotropic surfaces and deburring and edge-contouring sharp edged features
Centrifugal Iso-finishing for Additive Manufactured PartsDDaveDavidson
Centrifugal Iso-Finishing is a high-energy, high-quality, high-speed hands-free mechanical method for deburring, finishing and polishing of 3D printed (additive manufactured) parts as well as coventional subtractive manufactured parts. High Centrifugal force is utilized to accelerated process cycle times and make use of smaller dimensioned media to access intricate and complex part shapes. Useful for hand-deburring minimization and for developing low-micro-inch polished surfaces. Centrifugal Iso-Burnishing can be used for developing compressive stress in part surfaces on the order of that achieved by shot peening making parts much more resistant to fatigue failure or fracture. Plateaud or planarized surfaces improve bearing load capacity of cooperating parts with more wear resistance and improved tribological properties. FREE sample part finishing available, Contact Dave Davidson at ddavidson@deburring-techgroup.com. SEE ALSO https://dryfinish.wixsite.com/iso-finish
INTRODUCTION: The Turbo-Finish process (also referred to as Turbo-Abrasive Machining )imparts beneficial compressive residual stress to edges and surfaces. and as all critical features of the part are processed simultaneously, it can produce a stress equilibrium throughout the entire part. One of the signature advantages of the process is that it is capable of producing peening like metal surface improvement effects, while simultaneously developing isotropic surfaces and deburring and edge-contouring sharp edged features This combination of edge and surface effects can help extend part life on components by mitigating crack propagation.
Turbo abrasive machining tech paper - 2016Dave Davidson
INTRODUCTION: Turbo-Finish technology (also referred to as Turbo-Abrasive Machining) is a dry, high-speed spindle finishing process that utilizes abrasive fluidized bed technology, and high speed part rotation to develop extremely rapid and uniform edge and surface conditioning on aerospace, automotive and industrial parts. Polishing, deburring and edge radiusing are accomplished anywhere that the media can access. This finishing technology can develop isotropic surface finishes s while developing consistent round edges on any exposed sharp edged features.
Turbo-Finish and premature fatigue failure prevention and life extension. Turbo-Finish’s unique ability to produce isotropic surfaces on rotating parts can make them much less susceptible to problems associated with crack propagation. Additionally, the elimination of stress risers, and the generation of round edges are used to help extend component life. Rotating parts can especially benefit from the Turbo-Finish process. Disks and other rotating parts can all benefit from this surface and edge conditioning. Highly finished surfaces also tend to pick up less residual contaminants from operations. and smooth isotropic surfaces generate less turbulent air flow across their surfaces. Additionally, the Turbo-Finish process imparts beneficial compressive residual stress. As critical features of the part are processed simultaneously, it can produce a stress equilibrium throughout the entire part. One of the signature advantages of the process is that it is capable of producing peening like metal surface improvement effects, while simultaneously developing isotropic surfaces and deburring and edge-contouring sharp edged features
Centrifugal Iso-finishing for Additive Manufactured PartsDDaveDavidson
Centrifugal Iso-Finishing is a high-energy, high-quality, high-speed hands-free mechanical method for deburring, finishing and polishing of 3D printed (additive manufactured) parts as well as coventional subtractive manufactured parts. High Centrifugal force is utilized to accelerated process cycle times and make use of smaller dimensioned media to access intricate and complex part shapes. Useful for hand-deburring minimization and for developing low-micro-inch polished surfaces. Centrifugal Iso-Burnishing can be used for developing compressive stress in part surfaces on the order of that achieved by shot peening making parts much more resistant to fatigue failure or fracture. Plateaud or planarized surfaces improve bearing load capacity of cooperating parts with more wear resistance and improved tribological properties. FREE sample part finishing available, Contact Dave Davidson at ddavidson@deburring-techgroup.com. SEE ALSO https://dryfinish.wixsite.com/iso-finish
Centrifugal Iso-Finishing for Additive Manufactured PartsDave Davidson
Centrifugal Iso-Finishing Technology is used on 3D Printed and conventional CNC precision machined components for deburring, finishing and polishing. It is a high-speed, high-quality hands-free finishing method that produces highly refined surface finishes in a fraction of the time required by other equipment (10 times faster, in many cases) Free sample finishing of your parts is available, contact Dave Davidson at ddavidson@deburring-tech-group.com
Technical article reprint on the high-speed and high-intensity and high-quality Centrifugal iso-Finishing method.. The methods used widely on aerospace, motorsports, automotive, medical, dental, orthodontic and jewelry manufactured parts. For additional information contact Dave Davidson at ddavidson@deburring-tech-group.com. Ask about the free sample part finishing program.
See also the technical blog at https://dryfinish.wordpress.com
Centrifugal Iso-Finishing Technical article as seen in Products Finishing mag...Dave Davidson
This high-speed, high-intensity mass finishing
method can improve part performance. Centrifugal iso-finishing can be used not only for deburring and edge-contour, but also to
develop surface finish attributes that improve the performance,
surface integrity and service life of components.
A High-Speed, High-Energy Alternative
Centrifugal iso-finishing is a high-speed and high-intensity
mass finishing method in which abrasive or polishing materials are caused to interact with part edges and surfaces
with 10 times the surface pressure of low-energy finishing
methods. What this means, in practical terms, is that it is
possible to produce very refined surface finishes in abbreviated process cycle times. It also means that parts with
complex and detailed geometries can be deburred with a
minimum of manual intervention.
Turbo-Abrasive Machining in the Continuous Flow Environment Dr Michael Massarsky. Turbo-Finish Corporation, 917 518 8205 michael@turbofinish.com
turbofinish.wordpress.com
Theoretical and graphical analysis of abrasivewater jetturningIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Use of cutting fluids in machining processes can reduce the cutting temperature and provides lubrication to tool and work piece. These translate to longer tool life and improved surface quality. Metalworking fluids are a major cause of health hazards for operators apart from being sources of environmental pollution thus necessitating research in dry and minimum quantity lubrication (MQL) machining. The introduction of coolant techniques such as near-dry machining so called minimum quantity lubrication (MQL) and cryogenic coolant have shown promising performances especially in terms of cutting tool life. Nowadays, MQL is widely used in machining performances.
Centrifugal Iso-Finishing is a high-speed, high-quality and hands-free method for deburring, smoothing, surface-0finishing, burnishing and polishing of work-pieces and parts. Contact Dave Davidson for additional technical information and assistance with getting your parts sample finished. Contact me at ddavidson@deburring-tech-group.com See also dryfinish.wordpress.com
Modern machine-shop-apr-18 centrifugal isofinishing crnakshaftsDave Davidson
See the technical article on Centrifugal Iso-Finishing on surface finish and it's effect on engine components in the Motorsports Industry terms of performance improvement.
Contact D. A. (Dave) Davidson at ddavidson@deburring-tech-group.com for additional information or help with free sample finishing.
Iso-Finishing sample part finishing application formDave Davidson
Free sample part processing and quotations for deburring, finishing or polishing of your production parts.
(1) Download the Word document form into your computer.
(2) Complete the form and include a paper copy with your sample parts to being shipped to the Isofinishing address shown on the form
MFI full finishing product catalog with technical assistance infoDave Davidson
Mass Finishing Equipment and Supply Catalog includes equipment, finishing media, supplies and accessories. Features Centrifugal Iso-Finishing equipment for high-speed and hands-free deburring, finishing and polishing. For technical assistance and help with arranging for free sample finishing of your parts contact Dave Dagvidson at ddavidson@deburring-tech-group.com
It's the Finish that Counts. Technical Magazine article reprint.Dave Davidson
A conventionally produced surface (turned, milled,
ground, EDM) is typically Gaussian in nature, that is,
the peak and valley distribution is pretty much equal
in height. This type of surface can be very unstable and
unpredictable when wear and load bearing are considered. The images in Figure 1 demonstrate this type of
surface.
There are many ways to produce plateaued surfaces.
They are varied in approach but all have the ability to
control the surface peak characteristics separately for
the valley characteristics. Methods that are used to improve surfaces for performance and increased service life include centrifugal barrel finishing, turbo-abrasive machining (aka Turbo-Finish) and isotropic micro-finishing with vibratory finishing equipment. For additional technical information and/or elp with free sample part processing contact Dave Davidson at ddavidson@deburring-tech-group.om
Modern machine shop interviews Dave Davidson about Gear finishing processes. For additional technical information and assistance with sample part finishing contact Dave Davidson | ddavidson@deburring-tech-group.com # #machining #polishing #finish #cnc #manufacturingengineering #automotiveindustry #finishing #deburring #leanmanufacturing #aerospace #massfinishing #grinding #automotive #leanmaufacturing #gears
BV PRODUCTS - Bowl and Tub Vibratory Finishing SystemsDave Davidson
Vibratory finishing machines designed, engineered and built-in Australia that out-perform and out-last vibratory finishing machines costing much more.
Robust design with direct-drive motor and integrated parts/media separation for economical vibratory finishing of metal parts. BV Products has been perfecting its unique all cast polyurethane vibratory finishing machines with direct-drive motion generators for almost 40 years to make them the most innovative and most cost-effective surface finishing solution in the industry. Contact Dave Davidson: ddavidson@deburring-tech-group.com
BV PRODUCTS VIBRATORY FINISHING SYSTEMS FOR DEBURRING AND FINISHINGDave Davidson
Vibratory finishing machines designed, engineered and built-in Australia that out-perform and out-last vibratory finishing machines costing much more.
Robust design with direct-drive motor and integrated parts/media separation for economical vibratory finishing of metal parts. BV Products has been perfecting its unique all cast polyurethane vibratory finishing machines with direct-drive motion generators for almost 40 years to make them the most innovative and most cost-effective surface finishing solution in the industry. Contact Dave Davidson: ddavidson@deburring-tech-group.com
BV Products - Vibratory Finishing machinery for deburring and polishingDave Davidson
Vibratory finishing machines designed, engineered and built-in Australia that out-perform and out-last vibratory finishing machines costing much more.
Robust design with direct-drive motor and integrated parts/media separation for economical vibratory finishing of metal parts. BV Products has been perfecting its unique all cast polyurethane vibratory finishing machines with direct-drive motion generators for almost 40 years to make them the most innovative and most cost-effective surface finishing solution in the industry. Contact Dave Davidson: ddavidson@deburring-tech-group.com
Vibratory finishing machines designed, engineered and built in Australia that out-perform and out-last vibratory finishing machines costing much more. Robust design with direct-drive motor and integrated parts/media separation for economical vibratory finishing of metal parts. BV Products has been perfecting its unique all cast polyurethane vibratory finishing machines with direct-drive motion generators for almost 40 years to make them the most innovative and most cost-effective surface finishing solution in the industry. Contact Dave Davidson: ddavidson@deburring-tech-group.com
Centrifugal iso finishing sample processingDave Davidson
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish https://lnkd.in/gFjetZk
Centrifugal iso finishing contract services Dave Davidson
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish https://lnkd.in/gFjetZk
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish https://lnkd.in/gFjetZk
Centrifugal iso finishing - part dividersDave Davidson
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish https://lnkd.in/gFjetZk
Final vibratory iso-finishing processesDave Davidson
High-Speed iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish https://lnkd.in/gFjetZk
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish https://lnkd.in/gFjetZk
Centrifugal iso finishing - Equipment descriptionDave Davidson
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish
https://lnkd.in/gFjetZk
Centrifugal iso finishing - how it worksDave Davidson
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and iso-finish polishing at dryfinish@gmail.com | https://dryfinish.wixsite.com/iso-finish https://lnkd.in/gFjetZk
For additional information CONTACT Dave Davidson | dryfinish@gmail.com | https://en.gravatar.com/dryfinish
Wherever metals come into contact with each other contact stresses and friction occur. Both these conditions regulate and reduce the performance and compromise the design.
of the component. Super-finishing or CASF (Chemically Accelerated Surface Finishing) is a means of regaining those losses by producing a superfine finish where it is most needed.
Centrifugal iso finishing for High-Performance SurfacesDave Davidson
High-Speed, Hands-free deburring, iso-finishing and polishing of manufactured and 3D printed parts. Contact Dave Davidson for free sample finishing, technical assistance and contract deburring and finishing at dryfinish@gmail.com | https//about.me/dave/davidson | See the videos at https://dryfinish.wordpress.com
CONTACT: Dave Davidson
Debuuring/Finishing Technologist
dryfinish@gmail.com | 509.230.6821
https://partsfinished.wordpress.com
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Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
1. MECHANICAL FINISHING
Precision Finishing Processes
in Centrifugal Barrel Equipment
Methods promise faster cycling in select applications.
By David A. Davidson, Society of Manufacturing Engineers, 2006 Chair: Deburring
Technical Committee, Spokane, Wash.
L
arge numbers of parts can be uniformly edge
and surface finished in mass finishing equip-
ment. Process development in recent years has
facilitated the creation of very refined surfaces by
processing parts in a series of successively finer
processes in high-energy centrifugal equipment.
Nearly all manufactured and fabricated compo-
nents require some edge and surface finish prepa-
ration prior to final assembly. Although many parts
today are still individually handled and processed
with hand tools or hand-held power tools, it has
become almost universally accepted that utiliza-
tion of mass finishing techniques are preferred for
both their economic and technical merits, whenev-
er possible. Utilizing energy developed from motion
imparted to the containers or vessels in mass fin-
ishing equipment, loose abrasive, or polishing
media can produce a wide range of desirable edge
and surface effects.
Roughly machined, milled, molded, stamped, or
cast parts can be transformed into attractive parts
free or burrs, sharp edges, and corners with uni-
form surfaces that can range from the utilitarian
to the highly aesthetic. Among the specific tasks
these processes are specified to perform are clean-
ing, deburring, descaling, surface smoothing, edge-
break, radius formation, removal of surface con-
taminants from heat treat and other processes,
preplate, prepaint or coating surface preparation,
blending in surface irregularities from machining
or fabricating operations, producing reflective sur-
faces with nonabrasive burnishing media, refining
and polishing surfaces, and developing superfinish
or microfinish equivalent surface profiles.
CENTRIFUGAL BARREL FINISHING
Although many types of manufactured components
with high-volume output are abrasively processed
with barrel and vibratory finishing equipment,
many different types of parts with specialized or
precision edge and surface finish requirements are
processed in high-energy centrifugal barrel equip-
ment (see Figures 1–3).
Centrifugal barrel finishing (CBF) is a high-energy
finishing method (see Figure 4), which has come into
widespread acceptance in the last 25 to 30 years.
Although not nearly as universal in application as
vibratory finishing, many important CBF applications
have been developed in the last few decades.
Similar in some respects to barrel finishing, in
that a drum-type container is partially filled with
media and set in motion to create a sliding action of
the contents, CBF is different from other finishing
methods in some significant ways. Among these are
the high pressures developed in terms of media con-
tact with parts, the unique sliding action induced
by rotational and centrifugal forces, and accelerat-
ed abrading or finishing action. As is true with
other high-energy processes, because time cycles
are much abbreviated, surface finishes can be
developed in minutes, which might tie up conven-
tional equipment for many hours.
The principle behind CBF is relatively straightfor-
ward. Opposing barrels or drums are positioned cir-
July/August 2006 65
Figure 1: Centrifugal barrel finishing equipment, shown here, is
used to produce very refined surface finishes.The equipment is
very versatile—it can be used for both highly abrasive and pol-
ishing processes. The large, 220-liter-capacity machine to the
left can process large numbers of small parts in production, or
it can process larger parts by segregated processing in individ-
ual chambers or fixturing. The smaller machine has a total
capacity of 12 liters and is useful for smaller operations such as
dental laboratories, jewelry manufacturing, and precision screw
machine applications. It has a much higher degree of portabili-
ty than similar equipment in that it can be rolled from location
to location, and use single-phase, 110V current. (Photo courtesy
of Mass Finishing, Inc.)
2. cumferentially on a turret. (Most systems have
either two or four barrels mounted on the turret;
some manufacturers favor a vertical setup, and oth-
ers a horizontal orientation for the turret.) As the
turret rotates at high speed, the barrels are coun-
terrotated, creating very high G-forces or pressures,
as well as considerable media sliding action within
the drums.
Pressures as high as 50 Gs have been claimed for
some equipment. The more standard equipment
types range in size from one cubic foot (30 L) to 10
cubic feet, although much larger equipment has
been built for some applications.
Media used in these types of processes tend to be
a great deal smaller than the common sizes chosen
MECHANICAL FINISHING
66 www.metalfinishing.com
Figure 2: Centrifugal barrels are being used to develop very
demanding finish specifications, such as that shown here on
both the cast acrylic denture and dental partial frame. To pro-
duce precision finishes of this order, multiple process cycles in
the correct sequence are required that utilize differing media
types, including (1) ceramic abrasive media, (2) plastic fine fin-
ishing media, and (3) dry process polishing media. Processes
utilizing similar sequential steps are also specified for medical,
aerospace, bearing, electronic, automotive, and jewelry applica-
tions.The aesthetically desirable surface finishes developed on
the dental parts shown here also have important functional
characteristics, including reduced plaque adhesion and metal
fatigue resistance. (Photo courtesy of Mass Finishing, Inc.)
Figure 3: Close-up photo showing acrylic dentures and ceramic
media in processing step 1 as outlined in the caption for dental
parts shown in Figure 2. In this view, a 30-liter-capacity machine
is shown with four separate removable hexagonal barrel com-
partments with polyurethane linings. Typically, the abrasive
cycles in this type of processing are done in conjunction with an
aqueous solution in addition to the abrasive media, making for
a “wet process.” The final process often makes use of soft pol-
ishing media in a dry environment. (Photo courtesy of Metal
Finishing, Inc.)
Circle 113 on reader information card or go to
www.metalfinishing.com/advertisers
Circle 111 on reader information card or go to
www.metalfinishing.com/advertisers
Circle 055 on reader information card or go to
www.metalfinishing.com/advertisers
3. July/August 2006 67
MECHANICAL FINISHING
for barrel and vibratory process-
es. The smaller media, in such a
high-pressure environment, are
capable of performing much
more work than would be the
case in lower-energy equip-
ment. They also enhance access
to all areas of the part and con-
tribute to the ability of the
equipment to develop very fine
finishes. In addition to the abil-
ity to produce meaningful sur-
face finish effects rapidly, and
to produce fine finishes, CBF
has the ability to impart com-
pressive stress into critical
parts that require extended
metal fatigue resistance.
Small and more delicate parts
can also be processed with confi-
dence, as the unique sliding
action of the process seems to
hold parts in position relative to
each other, and there is general-
ly little difficulty experienced
with part impingement with
proper media and part loading.
Dry process media can be used in
certain types of equipment and is
useful for light deburring, polish-
ing, and producing very refined
isotropic superfinishes.
Practicality and questions of
cost effectiveness often deter-
mine whether high-energy
methods are selected over con-
ventional barrel or vibratory
processes. If acceptable surface
finishes can be developed in a
few hours, conventional equip-
ment is usually the most eco-
nomic alternative. CBF equip-
ment’s strong suit is the ability
to develop surface finishes that
may require lengthy time cycles
in conventional equipment and
the capability to develop a wide
range of special surface finishes
required for demanding and
critical applications.
REFERENCES:
Davidson, D.A., “Micro-Finishing
and Surface Texture,” Metal
Finishing, 100(7):10–12; 2002.
Davidson, D.A., “Mass Finishing
Processes,” 2005 Metal Finishing
Guidebook and Directory,
103(6A):78–89; 2005.
Hignett, J. Bernard, “Centrifugal
Barrel Deburring and Surface
Conditioning–Some Recent
Developments,” Technical
Paper: MR79-567, Society of
Manufacturing Engineers,
Dearborn, Mich.; 1979.
Gillespie, Laroux, Deburring and
Edge-Finishing Handbook,
Society of Manufacturing
Engineers, Dearborn, Mich.;
1999.
For more information, contact
Dave Davidson at (e-mail) ddavid-
son@mgnh.dyndns.org or visit
www.deburringsolutions.com. mf
Figure 4: Four barrels are mounted at the periphery of a
large turret. Each barrel is loaded with media, parts,
and water to approximately 50% to 90% full. During
operation, rotation of the large turret creates a cen-
trifugal force on the media and parts inside each barrel.
This force compacts the load into a tight mass, causing
the media and parts to slide against each other, remov-
ing burrs and creating superior finishes.This action also
reduces the cycle time needed to complete the finish-
ing of the parts by up to a factor of 30 over conven-
tional vibratory and barrel equipment. (Diagram cour-
tesy of Mass Finishing, Inc.)
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