Inspecting Outside Radii of a Small Steel Stamping

J

JJFar

#11
I don't think you can "eyeball" the difference between, say .018 and .021 on a radius gauge, especially when the radius is only 5 or 10 degees of the arc. If I filled out on an inspection report, "method of inspection" as "eyeballing", they'd laugh me out of the corps! We had a vendor and a customer checking some samples with their CMMs, and got different readings. I guess .020 is too small for CMM... different placement of the probes makes a big difference.
 
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Jim Wynne

Staff member
Admin
#12
I don't think you can "eyeball" the difference between, say .018 and .021 on a radius gauge, especially when the radius is only 5 or 10 degees of the arc. If I filled out on an inspection report, "method of inspection" as "eyeballing", they'd laugh me out of the corps! We had a vendor and a customer checking some samples with their CMMs, and got different readings. I guess .020 is too small for CMM... different placement of the probes makes a big difference.
You just can't expect tumbling (or anything other than machining) to establish a consistently-sized radius, if there's a radius at all. It's not going to happen. You're faced with either getting a customer to agree to that, or somehow fudging your inspection report and hoping for the best.
 

Stijloor

Staff member
Super Moderator
#13
I don't think you can "eyeball" the difference between, say .018 and .021 on a radius gauge, especially when the radius is only 5 or 10 degees of the arc. If I filled out on an inspection report, "method of inspection" as "eyeballing", they'd laugh me out of the corps! We had a vendor and a customer checking some samples with their CMMs, and got different readings. I guess .020 is too small for CMM... different placement of the probes makes a big difference.
My "eyeballing" was a slightly tongue-in-cheek comment...;)
You would never put this method of verification ("eyeballing") in an inspection report.
Quite a generous tolerance though. I agree with Jim's comments.

BTW, does that drawing make a reference to a dimensioning standard? ASME Y14.5 perhaps?
This standard has some nice definitions of "radius" and "controlled radius."
That wide tolerance may then give you some leeway on the shape of the contour of the radius.

Stijloor.
 
R

raju8177

#15
I have some suggestions, We are having similar type of parameter to measure. But the radius is required on the edges of the component, which avoids the fatigue failure. We are checking it on sampling basis by the Contour measuring machine with the measuring probe dia. of 5 microns.

Does the requirement are same as on edge or it is specified on the corners. Also it is not possible to check 100% parts byt visual means or with 10X magnification by the inspector.
 
R

raju8177

#18
Yes, the drawing calls out for Edge Radii, So you have go by Contour measuring method only. Here you have to set the your tumbling process to achieve the Edge radii as per mentioned in the drawing.
 

Jim Wynne

Staff member
Admin
#19
Yes, the drawing calls out for Edge Radii, So you have go by Contour measuring method only. Here you have to set the your tumbling process to achieve the Edge radii as per mentioned in the drawing.
There is no way to tumble a consistent radius onto the edges of a stamped part. The material is 316 SS, so if the tumbling medium is aggressive enough to break the edges, it's likely to result in a surface finish that looks like he11.
 
J

JJFar

#20
Jim:
After the aggressive tumbling process, it goes through a polishing step for a day or so, that imparts almost a mirror finish.
 
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