# Talk:Chamfer

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Should the second "exterior" read "interior? If not, would someone please clarify

• Thanks, I fixed it. Kappa 06:35, 15 Jun 2005 (UTC)

## chamfer notation on engineering drawings

When a chamfer is annotated on an engineering drawing, does the length correspond to the hypotneuse or the two equal edges of the right triange formed?

The complete answer is actually fairly complex, since it gets into GD&T (Geometric Dimensioning and Tolerancing, [1]). The short answer is that enough information must be shown to unambiguously describe the chamfer. Typically this is done by showing the lengths of the two non-hypotenuse sides of the triangle. Alternately, you could show the length of one such side as well as the angle formed between the chamfer and one of the sides of the object being chamfered. I have never seen a chamfer illustrated using the length of the hypotenuse; I suppose it could be done, but for GD&T reasons I won't get into, it's generally not a good way of doing it. Fasrad 16:48, 26 May 2006 (UTC)

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## is a fillet a chamfer?

quoted from article: "Chamfers may be both exterior (cutting off an external angle) and interior (filling in an internal angle). A fillet is the opposite, rounding off an interior corner."

The first sentence says that a fillet is a chamfer, as something that fills in an interior angle can be called a chamfer. The second sentece says that a fillet is the opposite of a chamfer, implying that something that fills in an interior angle is *not* a chamfer. --—Preceding unsigned comment added by 72.17.139.211 (talkcontribs)

It is my opinion that the real difference between a "fillet" and a "chamfer" is that a fillet is curved, while a chamfer is straight. This is consistent with the nomenclature of AutoCAD, and so I will change the text to match my understanding. (Certainly it's ambiguous as it was!)

--jackhmo —Preceding unsigned comment added by Jackhmo (talkcontribs) 17:18, 30 January 2009 (UTC)

AutoCAD input syntax cannot be taken as any more authoritative than someone's opinion regarding mechanical engineering terms. A fillet eases an inside corner, and may be radiused or blobby, such as a welding bead, less often sharply defined like a chamfer, which eases an outside corner or arris. __Just plain Bill (talk) 23:59, 30 January 2009 (UTC)
I can't speak to the AutoCAD syntax, because sadly I've never yet had a chance to learn AutoCAD. But I can say that if you ask the guy on the shop floor, a fillet is what eases an inside corner and a chamfer is what eases an outside corner. That is, what Bill said. — ¾-10 00:29, 31 January 2009 (UTC)
Okay, after further research, it is clear that fillet is only a rounded inside corner, as you said. A rounded OUTside corner is called a "round", although AutoCad still uses the "fillet" command to draw it. I'll fix the wording. Jackhmo (talk) 17:11, 24 February 2009 (UTC)
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## How does "chamfer" apply to a punch or rod?

While retreading a stripped bolt hole, the directions said "Punch or rod must have square end (no chamfer)." I am unclear from reading what I have so far how "chamfer" applies in this case. —Preceding unsigned comment added by 66.191.206.3 (talk) 21:26, 7 October 2007 (UTC)

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## Proposed merge from Lark's tongue

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## Word origin?

It seems like a rather unusual word - is it named after a specific person or thing? I know this isn't a dictionairy, but it would be nice if the article explained the word's origin... —Preceding unsigned comment added by 131.107.0.85 (talk) 18:38, 9 March 2010 (UTC)

See http://www.merriam-webster.com/dictionary/chamfer. Apparently, literally, "edge breaking". Cheers, — ¾-10 23:53, 12 March 2010 (UTC)
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