ChristophMy gastronorm container (size "1/4" x 200 mm) arrived!
Measured inner dimensions:
At the top: 232 mm x 134 mm
At the bottom: 215 mm x 115 mm
Corner radius at the bottom, side to side: about 32 mm
Corner radius at the bottom, side to bottom: about 15 mm
In order to see how flat the bottom might be I just put it on the stove with some water:
As the water started to boil it was possible to see where the bubbles start to grow, which was just a smallish part of the bottom:
To be fair, the lower left part is probably limited by the size of the stove area itself, but even then only about 1/4 or 1/3 of the area seems to have contact with the stove.
However, this observation might be totally wrong because the existence of bubbles only indicates where the bottom is surely heated, but the absence of bubbles doesn't necessarily indicate that the respective area is not heated.
Nonetheless, this was not a waste of time. I'll call it not flat.
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A good way to check the flatness of something is to spray a light coat of paint on to it and put a piece of sandpaper on a flat table and lightly sand the painted surface. High spots will have the paint removed and low spots will retain the paint. Better accuracy can be had by using polishing compound on a piece of thick (6mm or thicker) glass instead of the sandpaper. With either method, the object is not to remove material, just paint. Clean the paint off when you are done with solvent.
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True, this was quicker though and just came to my mind when I unpacked the container
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