I have a very basic question but it's been bothering me lately, what is the reason that scales like 1:3 and 1:4 or 1:7 and 1:8 are not allowed as drawing scales?
Understandable to avoid things like 1:2.25 or 1:7.5 where you're messing around with decimals in there, but why not other whole numbers?
I set the scale to whatever 'fill's" the drawing sheet and provides the best visibility. I have recently had scales of 1:1.65, 1:1.2 and others. It is just a reference number.