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Old 12-05-2022, 04:12 PM   #11 (permalink)
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To be fair, it was a proof of concept.

It sounds like a job for dimple dies.

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Old 12-05-2022, 04:30 PM   #12 (permalink)
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'dimple'

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Originally Posted by freebeard View Post
To be fair, it was a proof of concept.

It sounds like a job for dimple dies.
I'd choose something more like what perforated landing platform, bell-mouthed holes are stamped with.
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Old 12-05-2022, 07:58 PM   #13 (permalink)
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Quote:
https://en.wikipedia.org wiki Marston_mat
Marston Mat - Wikipedia
Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and landing strips (also misspelled as Marsden matting ).
I'd suspect steel strips were rolled into contour, punched and dimple died in a series of passes. Hot rod parts are one-offs.
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Old 12-08-2022, 02:07 PM   #14 (permalink)
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Hot Rod

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I'd suspect steel strips were rolled into contour, punched and dimple died in a series of passes. Hot rod parts are one-offs.
I was referring to something that might be used to mass-produce low-loss inlet openings for the 'wall of fans.'
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Old 12-08-2022, 05:23 PM   #15 (permalink)
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What would that be then?

Maybe a chamfer rather than a radius?
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Old 12-08-2022, 05:58 PM   #16 (permalink)
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that

https://janfordsworld.blogspot.com/2...-planking.html
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What would that be then?

Maybe a chamfer rather than a radius?
Whatever tooling was used to create the bell-mouthed openings in the perforated landing material, as I've already said.
Chamfers are a no-no, only a radius. I published this decades ago here at EcoModder.
Look down the throat of any carburetor on the planet and you'll see what I'm talking about.

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