There is a bit of a conflict :argue: brewing over here and so as to not bias this thread I will not input my opinion at this point. My replacement is new to stamping just as I was when I started here. We just received a take over job and it has a poorly designed tool. It produces a burr up near but not above 10% of metal thickness. My young apprentice saw this and asked if it was acceptable do to handling concerns. The owner of the company said that it was within the industry standard of a 10% burr there for is acceptable.
The young buck asked where this is published and how he is supposed to know this as it is not on any of the customer supplied documentation. The owner replied it was common knowledge.
Does anyone know if such a "standard" does exist and if so where is it and what is it?
By the way I know that the quote has that burr issue stated in the quote so we are "covered" technically.
Any help would be appreciated.
Mark

10% of material thickness for a burr is pretty much the industry standard. It does not however mean it will be acceptable to a customer. Some sort of deburring activity (tumbling etc.) may be required to prevent a handling issue.

There is a bit of a conflict :argue: brewing over here and so as to not bias this thread I will not input my opinion at this point. My replacement is new to stamping just as I was when I started here. We just received a take over job and it has a poorly designed tool. It produces a burr up near but not above 10% of metal thickness. My young apprentice saw this and asked if it was acceptable do to handling concerns. The owner of the company said that it was within the industry standard of a 10% burr there for is acceptable.
The young buck asked where this is published and how he is supposed to know this as it is not on any of the customer supplied documentation. The owner replied it was common knowledge.
Does anyone know if such a "standard" does exist and if so where is it and what is it?
By the way I know that the quote has that burr issue stated in the quote so we are "covered" technically.
Any help would be appreciated.
Mark I'f your customer accepted the <10% burr, there is no issue. That is part of the terms of the contract. Now, if it was known that this might not be acceptable and it was it buried in fine print, it may be the last job you do for that customer.

Poorly designed or poorly sharpened tool? sometimes the lineup of mating dies can result in a burr, as well.

Who owns the tool? You or customer? If customer, the flaw needs to be reported to tool owner and WRITTEN instructions received for dealing with the flaw, such as:

resharpen tool
deburr after stamping
leave as is, burr is acceptable
At any point in the supply chain, it is acceptable to be concerned about the ramifications of burrs:

can the burr break off in use and impair function of assembly?
can the burr be a safety hazard and cause cuts to operators during assembly?
can the burr impede assembly with mating parts?
If flaw in tool is not your design or maintenance, customer or tool owner is responsible to PAY your organization for remedial efforts.

Mark

Here is an answer, to the same question, posted in a metal forming industry forum.
"What is the industry standard for "burr" size on a conventially stamped metal part? Is there an SAE or ASTM standard I could refer to? I was told that 10% of material thickness is the norm. Is this correct?" (http://www.metalforming.com/forum/thread.cfm?threadid=1511&messages=2)




(http://www.metalforming.com/forum/thread.cfm?threadid=1511&messages=2)

Mark

Here is an answer, to the same question, posted in a metal forming industry forum.
"What is the industry standard for "burr" size on a conventially stamped metal part? Is there an SAE or ASTM standard I could refer to? I was told that 10% of material thickness is the norm. Is this correct?" (http://www.metalforming.com/forum/thread.cfm?threadid=1511&messages=2)




(http://www.metalforming.com/forum/thread.cfm?threadid=1511&messages=2)Please note the response in the metal industry forum indicates an "average" not a "Standard."

Bottom line - it is still up toi the customer to define requirements, but that doesn't absolve the supplier from asking for requirements.

Somehow i lost track of this thread thanks for your input. The issue was purely an internal arguement the customer is happy with the parts.
:thanx:
Mark