Machining burrs - any standard?

[Medan Ovidiu]

Hello guys,

I have this tipe off part:

The specification is say "part to be free from machining burrs"

On the drawing there is no any specification to be chamfren but our suplayer make a chamfer.
Final customer dont accept this chamfer on the part because is not mentioned on the 2D drawing or 3Dmodel.

My guestion is:
is there any standard in which is specified when you meet this note and how high the chamfer is allowed to be? Or cuting edge hight?

Thanks you!

 

[Ryan6338]

"part to be free from machining burrs" is not a defined term. ISO has a standard for defining edges, ISO 13715. The edge break symbol looks like this and defines a tolerance zone for edges.

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Ambiguous drawings get ambiguous results.

Ryan.

 

[Medan Ovidiu]

Thanks you Ryan!!!

 

[Wuzhee]

That's a lot of standards for geometric tolerancing!

 

[pmarc]

ISO has another standard, 21204:2020, that deals with transition between adjacent integral features. Interestingly, it states the following in the introduction:

"In technical drawings, the ideal geometric shape of the workpiece is represented without any deviations and, in general, without consideration of the states of the transitions between adjacent integral features. Nevertheless, for many purposes (the functioning of a part, or out of safety considerations, for example) particular states of transition features need to be indicated. ISO 13715 provides the tools for indicating requirements to edges of undefined shape. These tools are insufficient when the shape of the transition feature is important for functional reasons. Therefore, this document provides a set of tools for indicating transition specifications."