How to determine if two circular parts are concentric

[Anonymous]

Hello

I need some advice from the pros, for a simple hack to check if two parts are concentric. I am working on a gearbox, and the gear is not centered relative to the housing. So that means either the outer ball race is not centered on the housing cutout, the two ball races are not centered, the shaft is not centered in the inner ball race, or the gear is not centered on the shaft. is there any easy way to check if two parts have the same center in an assembly?

Thank you

[johnsonshiue · Accepted solution]

Hi! The quickest way is to measure the two center axes. Their angle and distance should be zero. If there is any minor imprecision, they are not concentric. Make sure turn up the precision in the Measure too. Sometimes the difference can be small.

Many thanks!

[SBix26 · Accepted solution]

Adding to what @johnsonshiue wrote, when using the Measure tool to measure between the parts' axes, you will need to use Select Other to select the axes-- the default Measure selection is the cylindrical face.  Generally, the first alternate under Select Other is the axis of the cylindrical face.

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Sam B
Inventor Pro 2021.2.2 | Windows 10 Home 2004
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