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ISO 5455 specifies the standard scales of 1, 2, 5, 10, etc. but qualifies them with the note:
"In exceptional cases where for functional reasons the recommended scales cannot be applied, intermediate scales may be chosen."
Because everyone here views & prints drawing on A or B size paper, we try to avoid using large drawing sheet sizes. An E size drawing printed out on B size paper is nearly illegible. In my quest to use the largest scale on the smallest sheet size I have taken to using 4 & 8 as well as the standards sizes. In addition, on detail views I have occasionally used 25 (we make some really small parts). My rationalization is that those scales are still multiples of 2, 5 & 10.
I would never use any scale whose reciprocal is an irrational number like 3 or 7.
Back in a previous life in a tool design shop I scaled drawings now and again. Slap a scale on a known dimension and pull out the calculator. Nothing I ever received was printed to any scale anyway, that's what dimensions are for. We also put everything on a C sheet so it prints readable on a B printer. I believe prints are more scalable now than ever before. I however pay absolutely NO attention to what the drawing scale says, Just make the views as large as possible for clarity.
Just my opinion
Thanks
Steve
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