Another instance of my programmer and I butting heads. First off, I want to ask... Is an alignment needed to measure the concentricity of 2 circles? If so, can a proper alignment be made with paint on the plane that we are leveling the part to? He says that even with paint (very uneven paint) on the part, the concentricity will be accurate. Again, be gentle.
As concentricity is basically two centre points measured on the same working plane if the plane is levelled to the datum required then the result of the two circles
centres are projected over each other. The result given is also relevant to the working plane if slightly skewed the distance the circles are apart will accentuate the error.
On cylinders the result has a length these need to be perpendicular and I personally would not use them as there can be more error.
Concentricity due to the reasons I have given is why most drawings call out True position now as it was prone to alignment skew error.
As concentricity is basically two centre points measured on the same working plane if the plane is levelled to the datum required then the result of the two circles
centres are projected over each other. The result given is also relevant to the working plane if slightly skewed the distance the circles are apart will accentuate the error.
On cylinders the result has a length these need to be perpendicular and I personally would not use them as there can be more error.
Concentricity due to the reasons I have given is why most drawings call out True position now as it was prone to alignment skew error.
