Clearance Cube

[[Ja...]]

I have a program with a part that was difficult to fixture. With the fixturing that I came up with, I need the stylus to stay close to the part. I have my +X and -X clearance cube set at like 0.500" but the stylus moves to about 2.00" from the part. I have my clearance set to zero and retract is very small. It is single probe in the down direction. Does anyone have any idea why this would happen?

[[Ja...]]

I got the program to run by changing the features to +Z clearance planes. 

[[Ma...]]

This behaviour is often by safety distance of measuring head. So if you would have probes wider than head, then you will have correcct distance, otherwise it will keep additional safety distance.

[[Ja...]]

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That's kind of what I figured. I have never had an issue with it before so if there is a setting somewhere that can be changed, I think I would rather leave it the way it is.

[[RP...]]

I have the same issue with our 1.0mm star probe.  I just create sub clearance planes for new programs, in case the programs before my arrival utilize the extra clearance.

[[Ka...]]

As Martin wrote,
There is also the safety distance of the sensor take in account. Especial using the RDS will sometimes result in "strange" to far distances.
I solved this problem by using negativ values of specific clearance planes. So you do not need to change the diameter definition at the KMG parameters. It´s a try an error thing and a little risky. 
The usage of a bounding box as clearance box ist the correct modern solution. Say you define a cube of 5mm and the clearance will be calculated as a shape of 5mm cubes around your part. Modern standard technique but.. we use ZEIS and this means some things need more time to be changed ( or never! ).