Space Screw Parts 8
Space Screw parts such as these are centrifugally finished to reduce hand deburring

Photo Above:  FINISHING APPLICATION PROFILE: Heather Lindsley, the Quality Assurance manager of Space Screw, Inc. in Rathdrum, Idaho demonstrates a Model HZ-120 Centrifugal Isotropic Finishing machine used by the company to replace hand deburring on their precision screw machine parts and turnings used in the aerospace industry.  Company officials estimate that the process has reduced their hand-deburring burden by 70-80 percent.  The process replaced the barrel

Space Screw Media Shot
One of the reasons centrifugal finishing is effective for small part finishing is its ability to make use of very finely sized finishing media that can access intricate part areas.  Using media this small in conventional finishing is problematic as these processes are incapable of producing sufficient force and pressure on smaller dimensioned media.  Centrifugal finishing commonly applies 10 – 15 G’s of force which can produce effective deburring and finishing results.

and vibratory finishing the company had been using which were inadequate to the task of replacing the hand deburring on their precision parts.  During a tour organized by the local SME (formerly: Society of Manufacturing Engineers) Chapter 248 in Spokane, WA, Heather related that on one part that had been vibratory finished prior to adopting centrifugal processing, the process time cycles were reduced from 1.5 hours to one minute.   [Editor’s note:  While the ability of centrifugal finishing equipment to finish parts more rapidly than other methods is well known, the preceding example is extraordinary]

Contact Dave Davidson: Contributing Editor | dryfinish@gmail.com | 509.230.6821
https://about.me/dave.davidson |  https://dryfinish.wordpress.com 

A wide variety of parts are being processed in centrifugal finishing barrel equipment to deburr, radius and produce extremely refined isotropic surface finishes. Among the many different types of parts finished this way are titanium surgical implants, musical instrument components, socket hardware, resin filled fabric bearing retainers, bearing races, gears surgical knee implants, aircraft engine blades and vane segments, roller bearings, plastic spheres, plastic consumer items, gear shafts and other drive components as well as crankshafts, turbo-rotor impellers, hardened powder metal components, heat treat scale removal, carbide tipped saw, and carbide end mill processing for service life extension and improved performance.

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Various equipment sizes and configurations are available from 12 liter (0.4 cubic feet) to 330 liters (10 cubic feet).  Each machine has four different barrels, in some cases 2, 3 and even four different processes can be run in each machine simultaneously for parts with differing requirements.  Ask about free sample processing for your parts, and contract finishing services that are available for your challenging deburring and finishing part problems.  dryfinish@gmail.com

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Mass Finishing technology for high-speed deburring, finishing and polishing of machined and manufactured parts and components

Centrifugal isotropic Finishing

Centrifugal Isotropic Finishing (CIF) is a high-energy finishing method, which has come into widespread acceptance in the last few years. Although not nearly as universal in application as vibratory finishing, a long list of 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 contact with parts, the unique sliding action induced by rotational and centrifugal forces, and accelerated 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 conventional equipment for many hours.

barfunc
Centrifugal Barrel Finishing principles – high-intensity finishing is performed with barrels mounted on the periphery of a turret. The turret rotates providing the bulk of the centrifugal action, the barrels counter-rotate to provide the sliding abrasive action on parts.

The principle behind CBF is relatively straightforward. Opposing barrels or drums are positioned circumferentially on a turret. (Most systems have either two or four barrels mounted on the turret; some manufacturers favor a vertical and others a horizontal orientation for the turret.) As the turret rotates at high speed, the barrels are counter-rotated, 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 1 ft3 (30 L) to 10 ft3, 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 for the barrel and vibratory processes. The smaller media, in such a high-pressure environment, are capable of performing much more work than would be the case in lower energy equipment. They also enhance access to all areas of the part and contribute to the ability of the equipment to develop very fine finishes. In addition to the ability to produce meaningful surface finish effects rapidly, and to produce fine finishes, CBF has the ability to impart compressive stress into critical parts that require extended metal fatigue resistance. Small and more delicate parts can also be processed with confidence, as the unique sliding action of the process seems to hold parts in position relative to each other, and there is generally little difficulty experienced with part impingement. Dry process media can be used in certain types of equipment and is useful for light deburring, polishing, and producing very refined isotropic super-finishes.

Below are some process video footage demonstrations of high-speed centrifugal isotropic finishing.  These automated edge and surface finishing methods are capable of producing very refined low micro-inch surfaces that can improve functional part performance and service life.

 

Further reading:  Internet resources

(1)  “Isotropic Mass Finishing for Surface Integrity and Part Performance”,  Article From: Products Finishing, Jack Clark, from Surface Analytics, LLC and David Davidson, from SME Deburr/Finish Technical Group, Posted on: 1/1/2015, [Barrel, vibratory, centrifugal and spindle finish can improve part performance and service life.]  http://www.pfonline.com/articles/isotropic-mass-finishing-for-surface-integrity-and-part-performance

(2)  “Turbo-Charged Abrasive Machining Offers Uniformity, Consistency”  Article From: Products Finishing, by: Dr. Michael Massarsky, President from Turbo-Finish Corporation, and David A. Davidson, from SME Deburr/Finish Technical Group.  Posted on: 6/1/2012.  [Method can deburr, produce edge contour effects rapidly]  http://www.pfonline.com/articles/turbo-charged-abrasive-machining-offers-uniformity-consistency

(3)  “Turbo-Abrasive Machining and Finishing”. MANUFACTURING ENGINEERING – Aerospace Supplement, by: Dr. Michael Massarsky, President from Turbo-Finish Corporation, and David A. Davidson, from SME Deburr/Finish Technical Group. [Method first developed for the aerospace industry can improve surface integrity and part performance]  http://www.slideshare.net/dryfinish/turboabrasive-machining-me-aerospace-supplement-reprint

(4)  “The Role of Surface Finish in Improving Part Performnce”, MANUFACTURING ENGINEERING, by Jack Clark, Surface Analytics.com and David A. Davidson, from SME Deburr/Finish Technical Group.
http://www.slideshare.net/dryfinish/november-2012-f4-deburring-1-final

(5)  “Free Abrasives Flow for Automated Finishing”, MANUFACTURING ENGINEERING, , by: Dr. Michael Massarsky, President from Turbo-Finish Corporation, and David A. Davidson, from SME Deburr/Finish Technical Group. [Exciting new methods of surface finishing that go beyond deburring to specific isotropic surface finishes that can increase service life]  http://www.slideshare.net/dryfinish/october-2013-f2-deburring-1

(6) Turbo-Abrasive Machining Demonstration Video:  

(7) SME Spokane, WA Factory Floor video, Centrifugal Finishing in the Precision Machine Shop: Demonstration)  

Dave Davidson: Contributing Editor | dryfinish@gmail.com | 509.230.6821
https://about.me/dave.davidson |  https://dryfinish.wordpress.com 

CONTRIBUTING EDITOR BIOGRAPHY –  David A. Davidson, [dryfinish@gmail.com]

Mr. Davidson is a deburring/surface finishing specialist and consultant.  He has contributed technical articles to Metal Finishing and other technical and trade publications and is the author of the Mass Finishing section in the current Metal Finishing Guidebook and Directory.  He has also written and lectured extensively for the Society of Manufacturing Engineers, Society of Plastics Engineers, American Electroplaters and Surface Finishers Association and the Mass Finishing Job Shops Association.  Mr. Davidson’s specialty is finishing process and finishing product development.

More about Dave Davidson…

davidson-pic3 (2)I am a deburring and surface finishing specialist, consultant and advisor to SME’s [Society of Manufacturing Engineers] Technical Community Network. The focus of my activity is assisting manufacturers and machine shops with reducing their dependence on hand or manual deburring and finishing methods, and helping them to upgrade the edge and surface finish quality of their parts. I currently work from Colville, WA but I assist clients nation-wide. I can arrange for free sample processing and process development for your challenging deburring and finishing needs and can provide you with either contract finishing services or the in-house capability to produce improved hands-free finishes on precision parts. I can be contacted at 509.230.6821 or dryfinish@gmail.com. Let me know if I can be helpful.

 

Subtractive Manufacturing Technology Blog

A wide variety of parts can be processed in centrifugal barrels to produce extremely refined surface profiles. among these are titanium surgical implants, musical instrument components, socket hardware, resin filled fabric bearing retainers, bearing races, gears surgical knee implants, aircraft engine vane segments, roller bearings, plastic spheres, plastic consumer items, gear shafts and other drive components as well as crankshafts, turbo-rotor impellers, hardened powder metal components, heat treat scale removal, carbide tipped saw, and carbide end mill processing for service life extension and improved performance

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