Speaking of Precision Blog

Speaking of Precision

Speaking of Precision is a knowledge preservation and thought leadership blog covering the precision machining industry, its materials and services. With over 36 years of hands on experience in steelmaking, manufacturing, quality, and management, Miles Free (Milo) Director of Industry Research and Technology at PMPA helps answer "How?" "With what?" and occasionally "Really?"

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Burrs, Deburring and FOD

Posted February 11, 2014 12:00 AM by Milo

Burrs and foreign object damage are consideration that are increasingly critical as precision machined parts are engineered from more challenging materials and to demanding geometries and applications.- Guest Post by John Halladay of Vectron, Inc.

Burrs are unwanted raised material remaining on a machined part as a result of prior manufacturing operations. Link here

Looks like unwanted raised material to me!

FOD can be either Foreign Object Debris or Foreign Object Damage asdefined by the

National Aerospace FOD Prevention, Inc. (NAFPI),

Foreign Object Debris (FOD): A substance, debris or article alien to a vehicle or system which would potentially cause damage.

Foreign Object Damage (FOD): Any damage attributed to a foreign object that can be expressed in physical or economic terms which may or may not degrade the product's required safety and/or performance characteristics.

"Cause damage, degrade product's safety or performance characteristics, and economic damage" - These are serious issues to manufacturers and their customers making critical human safety reliant systems- like automotive, aerospace, fluid power, or medical devices or systems.

Editor's Note: CR4 would like to thank Milo for sharing this blog entry, which you can finish reading here.

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Join Date: Oct 2007
Location: Tulare, CA
Posts: 1783
Good Answers: 35
#1

Re: Burrs, Deburring and FOD

02/12/2014 10:29 AM

That's why Quality Control is a critical job. I have machine shops that do good work and a machine shop that has had terrible luck. When I get a delivery of machined parts that have too many defects I reject the entire batch, so it is important for a machine shop to check their parts often. It's a lot cheaper to catch the errors early and resolve the issue than to have an entire batch rejected on you because you just ran all the parts and delivered on a Hail Mary Pass and hope we don't catch find any problems.

Leaving the surfaces rough that have been milled is also an issue. In my industry, we have a lot of chain driven machinery and sometimes those chains run along a track, if that track surface is rough it causes a great deal of vibration and noise and it doesn't take very much roughness to create that either. Even high and low spots does that too.

Another factor is not just the machining but the laser cutting. If you decide to go to a cheaper gas for laser cutting, that tends to leave a lot of rough edges and slag. It actually does make a difference from a nice clean edge to having to have someone hit the parts with a grinder. If there are a lot of parts that require cleaning up, we will back charge or reject the lot and that fab shop will have to redo the work, so thinking you are going to save a buck or two on cheaper gas might cost you more.

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