Confused by scale issue when set to 1:1_1

[Bob658]

I have two different models. both have the units set to metres and both have the scale set to 1:1_1. However when the 'Edit Drawing Scales' when you select the 1:1_1 it states at the bottom that '1 paper unit = 1 drawing unit' but in the other model ''1 paper unit = 0.001 drawing unit'. As you can't edit this I'm not sure how it happened. Can anybody shed any light on this.?

[CyberAngel]

How is "1:1_1" different from "1:1"? Is it possible there's a duplicate scale?

[Bob658]

It's not a duplicate scale. As far as I'm aware 1:1_1 is a standard scale and generally that's the only one I use. 

[BIGAL]

Need some more info, are you talking about plotting settings, we worked in metres, and when plotting just set the 1 printed unit = 1 drawing units, our title block was a A1 and if you checked the size of the title block in a layout it was 641x594. For A3 did 1 print = 2 drawing.

 

Or is it annotation scaling ?

Edited 13 hours ago by BIGAL

[Bob658]

It's causing a plotting issue. The way I work is, model space set to meters and scale is 1:1_1. Paper space is in millimeters. I then set the viewport scale to be whatever I want it to be. I've worked like this since starting using AutoCAD some 25 years ago.

Occasionally I get sent a file where this doesn't work and when I look into it, the problem is that for scale 1:1_1  it's set to '1 paper unit = 0.001' drawing unit'. This makes the viewport  scale1000 times larger. If I could edit it to be '1 paper unit = 1 drawing unit' it wouldn't be a problem but it won't allow me to edit it. If I'm plotting something at 1:5000 I have to pick the scale 1:5 as a work around.