KCC of Cylindricity Vs Straightness and Circularity
KCC of Cylindricity Vs Straightness and Circularity
(OP)
Hello,
The company's global team for a product family is calling out cylindricity as a KCC moving forward. Due to supplier relations/history on these products for our specific plant, we will be using straightness and circularity as KCCs. What are everyone's thoughts on this? Are we losing any control over the product by doing this?
Thanks.
The company's global team for a product family is calling out cylindricity as a KCC moving forward. Due to supplier relations/history on these products for our specific plant, we will be using straightness and circularity as KCCs. What are everyone's thoughts on this? Are we losing any control over the product by doing this?
Thanks.





RE: KCC of Cylindricity Vs Straightness and Circularity
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: KCC of Cylindricity Vs Straightness and Circularity
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: KCC of Cylindricity Vs Straightness and Circularity
What is wrong with cylindricity?
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JHG
RE: KCC of Cylindricity Vs Straightness and Circularity
RE: KCC of Cylindricity Vs Straightness and Circularity
You need to specify what you want. You don't care how they do it. If they inspect for straightness and circularity and ship you good parts, everything is fine. If you inspect and find they are not cylindrical, you send the parts back, and they review their procedure.
I have never specified cylindricity. It implies to me that you need the part to be round and straight, but that you can tolerate a lot of diameter error.
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JHG
RE: KCC of Cylindricity Vs Straightness and Circularity