Calypso total runout different than hard gauging.

[[Th...]]

I don't know why Calypso total runout between the cylinder and cone is .0004 when I get no more than .0001 on v-block and indicator reading. Filters are applied.

runout.png

[[Ch...]]

Thinh,

Hi - could be a number of reasons.

Is your datum OD Cylinder Outer Tangetial Eval ? as it would be in a V Block? (not LSQ).

[[Th...]]

No, but I have changed to your suggestion with no changes to output.

[[Dy...]]

What's your alignment?

[[Da...]]

how are you inspecting the cone?

[[Ri...]]

In the "Constraint" tab of the characteristic, for each feature, select "Normal Vector".

[[No...]]

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I may have misunderstood something here, but in a V-Block, doesn't the part only touch along two lines on the OD, and these lines constantly change.while it's turned? Meaning you don't even have a steady reference axis as you have on the CMM. It changes with the form error of the OD.

[[Da...]]

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I agree, it's difficult to get similar numbers from dissimilar conditions..

[[Ma...]]

I don't understand how it would even be possible to measure total runout of a cone with a v-block and indicator. This would require a means to move the indicator correctly along the angle of the cone to include the form error in the measurement. You can perhaps get some idea of what's really going on by looking at True Position of the cone at each end, radial runout of the individual circles that the cone is constructed from, form deviation of the cone and perhaps profile of the cone.

[[Ch...]]

Agreed,

The angle of the indicator tip will have a cosine effect.

[[Je...]]

I agree with the other folks. A V-Block and an indicator can measure circular runout but not cumulative runout.

[[Th...]]

I checked the runout on the cylinder on v block with two tenth indicators on each end and got less than a tenth. I then checked the cone at two sections and runout was less than a tenth. Is this a sound method?

[[Ma...]]

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It is a likely suitable method for checking circular runout but not total. Think of it this way, if the feature you were measuring was a cylinder instead of a cone would your method detect the error? What about if it was sphere, a barrel, or an hourglass instead of a cone. All of those shape deviations should cause huge total runout deviations but your method at best only determines that the circular runout of the sections you observe.

[[Ma...]]

Here is a link to some additional discussion regarding measurement of total runout of conical surfaces:

https://www.eng-tips.com/viewthread.cfm?qid=315985

[[Ch...]]

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100% agree. Will never be apples to apples