Precision Angle plate & V-block

[mklotz]

I certainly don't remember making such a calculation.

If we want to determine the maximum size of cylinder the block can accommodate* we have to first establish the measuring configuration. Just spitballing, I would think something like...

The chord between the two points of tangency of the cylinder with the V should be at least X distance below the line defining the width of the V opening. X might be defined as a percentage of the depth of the V measured perpendicular from the opening to the vertex.

Of course, the angle of the V would need to be specified. Most are 90 degrees but 60 degree exist.

Seems like we're not the only ones confused by this issue...

https://www.practicalmachinist.com/v...y-mean-297809/

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* A tacit assumption here being that the cylinder may not be supported on the ends of the V but rather must be enclosed within the V.