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# How is the Min Escape Hole defined?

How is the Min Escape Hole defined? [message #72773] Wed, 07 August 2013 17:37 UTC
For Sand Stone, the property spec is Min Escape Hole: One hole: 25mm, Two holes: 15mm, Four holes: 10mm.

Does 25mm mean: 25mm on a side, 25mm diameter hole, 25mm radius hole, or 25 sq mm hole.

Thanks.
Re: How is the Min Escape Hole defined? [message #72776 is a reply to message #72773 ] Wed, 07 August 2013 17:59 UTC
I would say diameter.

It is definitely not sq. mm as the dimension is mm.
Normally a hole is round: if it is a polygon I believe that would have been specified.
When we give dimensions for a hole we do not use radii but diameters - think drill bits (which create holes). The diameter is something which can be directly measured, a radius must be calculated in the real world.
Re: How is the Min Escape Hole defined? [message #72783 is a reply to message #72776 ] Wed, 07 August 2013 19:39 UTC
Thanks.

Of course, the easiest hole to create in 3D would be a triangular hole or quadrilateral hole by just deleting a polygon.and adding walls.
Re: How is the Min Escape Hole defined? [message #72790 is a reply to message #72783 ] Wed, 07 August 2013 21:08 UTC
That's true, but it would not make a very good looking aperture imo.

But if you wish to go that route, I would try for a similar area of hole as any of the specified combinations (although confusingly they don't add up to the same area).

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