DEBURR HOLES AND BREAK SHARP EDGES 4

[RyanMeister]

Our company has a boilerplate note on our fabricated metal drawings that says:
DEBURR HOLES AND BREAK SHARP EDGES.

Is it true that only drilled holes have "burrs" and that we need to "break" only edges to eliminate cutting hazards?

Comments?

 

[MechEng13]

Ryan,

It is not true that only drilled holes have burrs. Punched holes will have burrs as well. The height of the burr on a punched hole is somewhat dependent on the "gap"-for the foggy mind not remembering the proper term.

The primary purpose of breaking edges and deburr holes is for eliminating cutting hazard but also I have seen those same burrs and edges cause a fit problem.



Alan M. Etzkorn
Product Develpment Engineer
Wabash National Corp.

http://www.wabashnational.com

 

[Nate101]

Sometimes there are alternate edge break sizes for holes vs. the remainder of the part. A couple of examples: some rivets require a chamfer of a given size, some studded features require a zero edge break when installed.

 

[tomwalz]

I owned a business for a couple years where we deburred aircraft parts.

Depending on how you define it almost anything can leave a burr. Also breaking edges can add strength and help prevent crack propagation. There can also be a tearing issue. Deburring and edge preparation can also greatly aid assembly and later fitting. I would think eliminating cutting hazards is pretty low on the list of reasons to deburr. However we are in the edged tool business where a good cutting edge is desirable.

Tom

 

[BillPSU]

Deburring and breaking edges in the hydraulic valve industry is a science within itself. Extrusion deburring, thermal deburring, and electro chemical deburring are a some of methods used. Any burr can break off in a hydraulic system and cause a valve to stick or even damage seal or actuator surfaces. Minimal radii are allowed in many areas due to accurate cutoff locations for valve operation.

 

[Kenneth]

More reasons than you ever wanted to know for deburring can be found in thread2-34198...

 

[chalfont]

Most tools used to cut holes steel be it drills,reamers, slot drills, or boring heads will leave a burr.
Ensuring that the cutting tools used are sharp with the correct angles and clearances with help to reduce burrs.
De burring will help with alignment of any component that must go through the finished hole and allow a stepped component to seat square to the hole. Finally a neat deburred hole gives a better impression and is also safer for machinists.
Regards
Chalfont

 

[grippy]

Kenneth (Aerospace) Oct 27, 2004
More reasons than you ever wanted to know for deburring can be found in Thread2-34198...

Hands up all of you who read right through that thread suggested by Kenneth?

I did, and there really CAN'T be anything else to add to this thread now.

Thank you for the link, Kenneth.

Jon Weaving

http://www.gripsport.com.au