How to dimension a flat plane to an axis.

[jovo14]

I need to make a jig from a 1" diameter shaft about 3 " long. There needs to be a flat on the shaft that is in line with the center line of the shaft within .001". How can I use GD&T to accurately indicate that the axis of the shaft and the flat are inline?

 

[drawoh]

jovo14,

A profile tolerance will position your flat surface to your cylindrical datum feature.

If parallelism is more important to you, you can do a composite feature control frame with a parallel specification, and a profile.

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JHG