A radius gauge

[MichaelMoore]

I suppose the radii could be multiplied by 25.4 to make them metric.

Anyone who has even a small amount of knowledge of CAD could make the outline with standard metric sizes for standard metric stock, and any CNC shop could knock them out as they are a simple 2.5 D operation, no fancy surfacing involved.

Here's a PDF of the basic gauge. It is 16" long by 3.8" tall and I think the PDF should be to scale. All I did to create it was to make a number of circles and fit them to three sides of a rectangle, and then trimmed everything and put a radius on the sharp corners. That should give you an example to help you to lay out a metric version.

I hope that is of some assistance to you.

cheers,
Michael