Measuring the Small Radius on the Edge of a Strip of Metal

J

jager

#1
I've been asked to measure the radius on the edge of a 6 inch strip of metal which is .032" thick. We have a profile tracer and comparator and a vision system. I'm leaning towards wire cutting a piece and trying to use the vision system. Have you had any experience with measuring these small edges on thin material? Thank you
 
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Jim Wynne

Staff member
Admin
#2
I've been asked to measure the radius on the edge of a 6 inch strip of metal which is .032" thick. We have a profile tracer and comparator and a vision system. I'm leaning towards wire cutting a piece and trying to use the vision system. Have you had any experience with measuring these small edges on thin material? Thank you
What are the nominal and tolerance?
 
J

jager

#4
The radius they're shooting for is approx .024 - .055".
It is a spec the metal supplier is trying to hold. They are to have a radius on the edge of the stock and it is so small that they are having trouble measuring it and asked for my help.

Thanks
 

Jim Wynne

Staff member
Admin
#5
The radius they're shooting for is approx .024 - .055".
It is a spec the metal supplier is trying to hold. They are to have a radius on the edge of the stock and it is so small that they are having trouble measuring it and asked for my help.

Thanks
It sounds like you just want to make sure there's a radius (rather than a sharp edge) and size isn't critical? If that's the case, just use a radius gage. They're sized down to 1/64" (~.016), and it's a lot easier than trying to measure on end with a comparator.
 
G

George Weiss

#6
I am sorry, because this type of measurement is not my specialty, but I suggest this thought:
Because the radius is kept between two points as listed, and this is a wide spec by some views.
When looking down on the flat metal 6" strip at the edges, can the point of beginning of radius be seen?
If so, then can the beginning of radius to end/side of strip dimension then be viewed/measured with the viewing system?
From either top or bottom side of metal strip?
Wouldn’t this be a single point of radius measurement? (in this case no more is needed?)
Given: 0.032" material width, with 0.024" to 0.055" radius limits.
With this spec the radius is likely to come close to 0.75* –to- 1.50* the width of the material. Even a varying radius would not exceed the maximum radius point of directly horizontal. I would make a serious effort to make a vertical measurement from start of radius to side edge. If comparing is needed, then do so.
Even a special reflection assisting light source, to pick-up the radius beginning point.
maybe a dry eraser marking pen, or other item to enhance the edge contrast.
alot of hogwash right?
 
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apestate

Quite Involved in Discussions
#7
Get some play-dough or repro-rubber and make little negatives of it that you can check on the comparator.
 
J

jager

#8
Thank you for the ideas. I'll try them all and let you know how it all comes out. Yes, I think if a radius is "there", it should be ok, but I'll see what kind of readings I come up with.
 
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