What is difference between Runout and Concentricity, esp. just want to get a coaxiality. one more question about the concetricity vs vs concentricity question. People often ask if when they measure runout on a cylindrical feature that is coaxial to a datum axis are they also reading the concentricity error. In other words, the concentricity error cannot be greater than the measured runout. First, runout tolerances and concentricity require that a datum axis be established. Runout applies only to one circle of the surface AT A TIME. The tolerance zone is a hollow circle (think washer) around the datum axis with perfect form being the center of the zone. This controls location, orientation, and circularity. Note that concentricity does not control circularity but runout ricity vs run out vs total runout.
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Concentricity is a 3-Dimensional cylindrical tolerance zone that is concentricity vs runout by a datum axis where all the derived median points of a referenced circular feature must fall into.
First you must establish a datum axis which to measure, Once the datum axis is established you must now take measure many a series of cross sections however many is realistic.
Once the cross sections are taken and the exact plot of the surface is obtained, the median points of these concentricity vs runout sections must be determined.
Then these series of points must concentricity vs runout plotted to see if they fall within the cylindrical tolerance zone. This can only be done on a CMM or other computer measurement device and is quite time consuming.
Concentricity vs. Runout
While symmetry measured the true midpoint plane of a feature to a datum plane or axis, concentricity measures the derived midpoint axis to a datum axis. Both are notoriously difficult to measure.
Runout is a combination of concentricity concentricity vs runout circularity. The measured points must be contained within two coaxial cylinders 0. This is easier to inspect than concentricity vs runout, but more difficult to manufacture.
The above mentioned tolerance types can be sorted according concentricity vs runout ease of manufacturing and inspecting as shown in the below figures. Tolerance types for coaxiality concentricity vs runout according to ease of manufacturing Tolerance types for coaxiality sorted according to ease of inspection The ease of inspection will greatly depend on the device and setup used; CMM versus portable arm or a more conventional setup with dial gage References: American Society of Mechanical Engineers.
Concentricity | GD&T Basics
Concentricity requires verification of size, circularity roundness and position of features. Often I have seen concentricity called when runout is actually what is measured.
Unless you are dealing with extreme precision and speed, runout is almost always a sufficuent measure of whether features concentricity vs runout coaxial. You are obviously looking at this in a more theoretical way than I was.
Concentricity vs. Runout
While I agree with you technically, and many of those ideas are crucial in an enginaeering sense, I think a lot of what you say gets lost on the shop floor. If I had a piece of hexagonal bar in a lathe chuck and my indicator concentricity vs runout zero on the center of all the flats, I would say I had zero to within the accuracy of the indicator run out.
I see your point, that concentricity vs runout wrong, but that's what I would call it.
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