Linear Measurement - Radius Center or Intersection Point?

T

tluker

#1
I'm hoping someone here can help me out or point me in the right direction? I have a drawing that shows a linear measurement from one surface to the intersection of two angled surfaces. There is a radius where the two angled surfaces meet. We are currently having a debate in our lab on whether or not the linear measurement is to the center of the radius or to the theoretical intersection of the two surfaces. I'm trying to find an ISO standard for this but I'm not having any luck. I have seen it done both ways in the past but in this instance I'm reasonably sure that the dimension is to the theoretical intersection. Does anyone have any suggestions on where I could find a standard for this? I'm guessing there has to be an ISO standard or DIN spec somewhere but I'm not even sure where to start on this one? Thanks.
 
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Miner

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#2
Re: Radius Center or Intersection Point?

Please post the section of drawing to which you are referring.
 

Ron Rompen

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#4
I agree that USUALLY it would call out the intersection of the two surfaces, however that is not a safe assumption to make - if you are really unsure of it, don't assume that your customer is any more certain - call them up and ask them. There may well be a standard (I think it's called out in the ASME Y14.5 standard, but I don't have a copy handy) which clarifies this, but that doesn't mean that your customer did it correctly - and if you make the assumption that they followed the standard and it turns out wrong, you know who will get blamed for it :)
 
T

tluker

#5
It's not that I'm unsure but I have to convince a lab full of people that can't spell CMM that they are measuring this wrong. It started with them making one or two questionable measurements and they have since built on that to the point where I'm just shaking my head. I won't get into the details of just how bad this actually is but I really need to put a stop to this now. So I'm hoping to find a standard somewhere that spells this out?

And sorry I can't attach a picture, but it's just the distance from one surface to the intersection of two other surfaces.
 
T

tluker

#7
If only people would follow that drawing standard when creating drawings, but they rarely do for drawings of machined parts.
 
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