What is "No Chamfer" 3

[PeteratPSP]

We are a contract manufacturer and I run into the same issue over and over.
What is the minimum chamfer allowance on a drawing callout for (No Chamfer)
Is there a measurable and or standard?

 

[ewh]

How about a radius edge break? It's not a chamfer, and it's not sharp.
I think MintJulep has the right idea.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[colew]

I agree with MikeHalloran; 'No Chamfer' is pretty clear that it is to be a sharp corner.
I disagree with ptruitt; trying to use GD&T for this would just confuse some people that hardly ever use GD&T or they would make up their own definition of what is on the drawing. I have actually had this happen.

 

[ptruitt]

(So far, we have five folks who think "No Chamfer" is clear and four who do not and one who started thinking it is clear and is now not so sure.)

Peter Truitt
Minnesota

 

[SteveMartin]

My take on this is "don't hit it with a chamfer tool". Technically I'd be hard pressed to call a part rejectable with a chamfer/round/edge break/whatever that fit within the limits of size of the hole & surface, even with the note.

I'm a fan of specifying what you want, not what you don't want. I agree with the suggestion to ask the customer what exactly it means.

 

[fcsuper]

When I want an edge left alone, I'll point to it and state "LEAVE EACH SHARP" if I have a general note (always listed as "UNLESS OTHERWISE SPECIFIED") that states "DEBURR ALL SHARP EDGES, CORNERS AND THREADS."

So, if the general note said "APPLY .01 MAX CHAMFER TO ALL SHARP EDGES," then it makes perfect sense to include a "NO CHAMFER" note on a specific edge.

That's not what the OP asked, though. KENET hit the nail on the head very quickly in the very first response. The note may be redundant, unless Halloran's scenario is encountered, in which case I would recommend looking for a new vendor.

Matt Lorono, CSWP
Lorono's SolidWorks Resources & SolidWorks Legion
Follow me on Twitter