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Burrs are unavoidable in sheet metal punching

hi,

How to explain a non-technical person the impossibility of burr free sheet metal part?

Whatever the shearing theory we explain to them, the final question from them is "why don't we try to eliminate burr from a punching operation?"

please help.

thanks,

Balaji Shanmugam
- Chennai, India
March 1, 2009

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March 3, 2009

Hi, Balaji. I understand your problem: your customer doesn't want burrs. Who would? The question will be whether they are willing to pay for you to deburr the parts.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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I think your customer really knows the answer, he just doesn't want to admit it. Besides fit, form and function, safety is a big issue to both the handlers and mating parts. Maybe your client doesn't care about those issues. Hello lawsuit.

AF Kenton
retired business owner - Hatboro, Pennsylvania
March 9, 2009

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March 9, 2009

My read is just the opposite. The customer does not like the burs.
There is a high probability that they do not want to pay for a deburring operation.
That said, a poorly fitting punch or a dull one will leave large burs that could at least be reduced.
I suspect that it is some of both.

James Watts
- Navarre, Florida

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I agree with Mr. Watts, it could be that the customer isn't so dumb after all and knows that a dull tool can cause an excessive burr and is just trying to get the supplier to pay attention to the details.

Sheldon Taylor
supply chain electronics
Wake Forest, North Carolina
March 12, 2009